Enigma-NG Consolidated BOM & Spares

Status: Draft — pending schematic freeze Project: Enigma-NG Author: Izzyonstage & GitHub Copilot Version: v1.0.0 Last Updated: 2026-04-21

Overview

This is the consolidated Bill of Materials for all boards and modules in the Enigma-NG system. It covers critical spares, common passives, high-speed interconnects, power components, and supplier reference information. For per-board BOM notes and design constraints, refer to each board's individual Design_Spec.md file.

Review Policy: Parts marked 🔒 have been confirmed by the project owner. Do not modify 🔒-marked items without owner approval.

Component Usage Summary

This table shows the component count per board instance and system-wide totals, accounting for ×6 Encoder Modules and ×30 Rotor boards in the complete system. The EXT column shows per-board quantities for one Extension board; Rev A uses ×1 Extension board, while the full 30-rotor build requires ×5 Extension boards (one between each pair of 5-rotor groups). System Total reflects the Rev A single-Extension configuration unless otherwise noted. Role-specific Encoder Module populations are broken out as dedicated static rows rather than range-valued quantity cells. Assembly-level plugboard jacks and keyboard switches are listed in §4a instead of this board matrix.

MPN / Description	PM	CTL	STA	ENC (×1)	ENC Total (×6)	ROT (×1)	ROT Total (×30)	REF	EXT	JDB	SBD	System Total
EPM240T100I5N — Intel MAX II CPLD (TQFP-100)	—	—	—	1	6	—	—	—	—	—	—	6
EPM570T100I5N — Intel MAX II CPLD (TQFP-100; 570 LEs; drop-in for EPM240; used on Stator and Rotor boards)	—	—	1	—	—	1	30	—	—	—	—	31
INA219AIDR — Zero-Drift Power Monitor (SOIC-8)	1	—	1	—	—	—	—	—	—	—	—	2
PCA9534APWR — I²C GPIO Expander 8-bit (TSSOP-16)	1	—	—	—	—	—	—	—	—	—	—	1
FDC2114RGHR — 4-ch Capacitive Sensor IC, U2 Track A (bits[5:3] N=64; bits[3:0] N=26), Board A, addr 0x2A (16-VQFN)	—	—	—	—	—	1	30	—	—	—	—	30
FDC2114RGHR — 4-ch Capacitive Sensor IC, U3 Track B (bits[2:0] N=64 only; NOT POPULATED for N=26), Board B, addr 0x2B (16-VQFN)	—	—	—	—	—	1	30	—	—	—	—	30
FDC2114RGHR — 4-ch Capacitive Sensor IC, U4 STGC bit[4] (N=26 only; NOT POPULATED for N=64), Board A, addr 0x2B (16-VQFN)	—	—	—	—	—	1	TBD	—	—	—	—	TBD (N=26 builds only)
SN74LVC2G125DCUR — Dual 3-State Buffer (VSSOP-8)	—	—	—	—	—	—	—	—	1	1	—	2
SN74LVC1G14DBVRQ1 — Single Schmitt Inverter (SOT-23-5)	2	—	—	—	—	—	—	—	—	—	—	2
FT232HL-REEL — USB 2.0 to MPSSE Bridge (QFN-56)	—	—	—	—	—	—	—	—	—	1	—	1
CM5 — Raspberry Pi Compute Module 5	—	1	—	—	—	—	—	—	—	—	—	1
TPS75733KTTRG3 — 3.3 V LDO Regulator (TO-263 KTT 5-pin)	1	—	—	—	—	—	—	—	—	—	—	1
TPS259804ONRGER — eFuse / Hot-Swap Controller (VQFN-24)	1	—	—	—	—	—	—	—	—	—	—	1
LMQ61460AFSQRJRRQ1 — 5 V Synchronous Buck Converter (VQFN-HR RJR 14-pin 4×3.5mm)	2	—	—	—	—	—	—	—	—	—	—	2
LTC3350EUHF#PBF — Supercapacitor Manager (QFN-38)	1	—	—	—	—	—	—	—	—	—	—	1
TPS25751DREFR — USB PD 3.1 DRP Controller (WQFN-38)	1	—	—	—	—	—	—	—	—	—	—	1
STUSB4500LQTR — USB-C Sink Controller (QFN-24)	1	—	—	—	—	—	—	—	—	—	—	1
LM74700QDBVRQ1 — Ideal-Diode OR-ing Controller (SOT-23-6)	3	—	—	—	—	—	—	—	—	—	—	3
MCP121T-450E/LB — 4.5 V Voltage Supervisor (SC70-3)	1	—	—	—	—	—	—	—	—	—	—	1
TPS2372-4RGWR — PoE PD Interface Type 4 (VQFN-20)	—	1	—	—	—	—	—	—	—	—	—	1
TPS23730RMTR — PoE ACF DC-DC Controller (WQFN-20)	—	1	—	—	—	—	—	—	—	—	—	1
MIC1555YM5-TR — CMOS Timer / LED Oscillator (SOT-23-5)	2	—	—	—	—	—	—	—	—	—	—	2
TPS2065C — USB Power Distribution Switch (SOT-23-5)	—	1	—	—	—	—	—	—	—	—	—	1
AP2331W — HDMI Current Limiter (SOT-23-5)	—	1	—	—	—	—	—	—	—	—	—	1
TPD4E05U06QDQARQ1 — 4-Channel ESD Array (U-DFN-10)	1	3	—	—	—	—	—	—	—	—	—	4
TPD1E10B06DYARQ1 — Single-Channel ESD (SOD-523)	1	—	—	—	—	—	—	—	—	—	—	1
TPD2E2U06DRLR — Dual-Channel SMBus ESD (SOT-553)	1	—	—	—	—	—	—	—	—	—	—	1
CSD17483F4T — 30 V 10 A N-ch OR-ing MOSFET (SON-8)	3	—	—	—	—	—	—	—	—	—	—	3
BSS138 — 50 V N-ch Logic-Level MOSFET (SOT-23)	7	—	—	—	—	—	—	—	—	—	6	13
TBD — Dual Schmitt inverter / buffer, 1.65-5.5V, 3.3V logic compatible (SW2 LED_nPWR / PWR_BUT conditioning)	1	—	—	—	—	—	—	—	—	—	—	1
TBD — Single D-type flip-flop with async clear, 1.65-5.5V, 3.3V logic compatible (SW2 shutdown latch)	1	—	—	—	—	—	—	—	—	—	—	1
TBD — Single 2-input AND gate, 1.65-5.5V, 3.3V logic compatible (SW2 red blink gate)	1	—	—	—	—	—	—	—	—	—	—	1
BAT54 — Schottky Diode (SOT-23)	2	1	—	—	—	—	—	—	—	—	—	3
MCP23017T-E/SO — I²C GPIO Expander 16-bit (SOIC-28)	—	—	3	—	—	—	—	—	—	—	3	6
PCA9685BS/3 — I²C 16-ch PWM Driver (SSOP-28)	—	—	1	—	—	—	—	—	—	—	—	1
J_DSI1 — DSI1 FPC 15-pin 1.0mm ZIF connector (Amphenol F52Q-1A7H1-11015)	—	1	—	—	—	—	—	—	—	—	—	1
0.1 µF X7R 0402 decoupling cap — common fitted population	15	1	9	8	48	8	240	—	1	4	4	322
0.1 µF X7R 0402 encoder input RC filter cap — encode-role population only	—	—	—	64	192	—	—	—	—	—	—	192
10 µF X7R 50 V 1206 bulk decoupling (CL31B106KBHNNNE)	—	5	5	5	30	5	150	5	5	—	—	200
22 µF X7R 25 V 1210 bulk cap (CL32B226KAJNNNE)	13	—	—	—	—	—	—	—	—	—	—	13
47 µF X7R 25 V 2220 buck output bulk cap (TDK CGA9N3X7R1E476M230KB)	4	—	—	—	—	—	—	—	—	—	—	4
4.7 µF X7R 1210 entry filter (CGA6P3X7R1H475K250AD)	—	—	—	—	—	—	—	—	—	1	—	1
10 µF 16 V X7R 1206 monostable timing cap (CC1206KKX7R8BB106)	1	—	—	—	—	—	—	—	—	—	—	1
1 µF X7R 50 V 0805 (C0805C105K5RACTU)	3	—	—	—	—	—	—	—	—	—	—	3
10 µF 25 V X7R 1206 LDO input cap (C1206C106K3RACTU)	1	—	—	—	—	—	—	—	—	—	—	1
10 nF X7R 50 V 0402 soft-start cap (CL05B103KB5NNNC)	—	1	—	—	—	—	—	—	—	—	—	1
10 nF 100 V X7R 0402 Bob Smith termination cap (C0402C103K1RACAUTO)	—	1	—	—	—	—	—	—	—	—	—	1
100 pF X7R 25 V 0402 SYNC SW-ringing LP filter (C0402C101K3RACAUTO)	1	—	—	—	—	—	—	—	—	—	—	1
22 nF X7R 25 V 0603 SYNC phase-delay cap (CL10B223KB8WPNC)	1	—	—	—	—	—	—	—	—	—	—	1
25 F / 2.7 V Supercapacitor (Abracon ADCR-T02R7SA256MB)	8	—	—	—	—	—	—	—	—	—	—	8
22 µF 25 V X7R 1210 5V_MAIN backup bulk cap C14/C15 (Samsung CL32B226KAJNNNE)	2	—	—	—	—	—	—	—	—	—	—	2
10 kΩ 1% 0603 pull resistor (ERJ-3EKF1002V / C191124)	6	2	16	—	—	—	—	—	—	—	13	37
10 kΩ 1% 0402 pull resistor — common fitted population (ERJ-2RKF1002X / C191123)	2	—	1	4	24	4	120	—	—	2	—	149
10 kΩ 1% 0402 encoder input pull-up — encode-role population only (ERJ-2RKF1002X / C191123)	—	—	—	64	192	—	—	—	—	—	—	192
75 Ω 1% 0603 series resistor (ERJ-3EKF75R0V / C105905)	—	—	9	—	—	—	—	—	—	—	—	9
75 Ω 1% 0402 resistor (ERJ-2RKF75R0X / C413061)	—	4	—	1	6	—	—	—	—	—	—	10
33 Ω 1% 0603 series resistor (ERJ-3EKF33R0V / C25819)	—	—	—	—	—	—	—	—	—	—	—	—
33 Ω 1% 0402 series resistor (ERJ-2RKF33R0X / C25808)	—	—	—	—	—	—	—	—	—	4	—	4
22 Ω 0603 1% JTAG end-of-chain damping (ERJ-3EKF2200V)	—	—	—	—	—	—	—	1	—	—	—	1
330 Ω 1% 0402 LED current-limit resistor (ERJ-2RKF3300X / C105872)	—	—	—	1	6	—	—	—	—	—	—	6
330 Ω 1% 0603 Ethernet activity LED resistor (ERJ-3EKF3300V / C25803)	—	2	—	—	—	—	—	—	—	—	—	2
4.7 kΩ 1% 0603 I²C pull-up (ERJ-3EKF4701V / C192166)	2	—	—	—	—	—	—	—	—	—	—	2
100 Ω 1% 0603 differential termination (ERJ-3EKF1000V / C193336)	—	1	—	—	—	—	—	—	—	—	—	1
20 mΩ 1% 1206 current-sense shunt (ERJ-6ENF20R0V / C123465)	—	—	—	—	—	—	—	—	—	—	—	—
10 mΩ ±1% 5 A 2512 Kelvin shunt (CSS2H-2512R-R010ELF)	2	—	1	—	—	—	—	—	—	—	—	3
121 kΩ 1% 0603 PoE MPS current set (ERJ-3EKF1213V / C402905)	—	1	—	—	—	—	—	—	—	—	—	1
301 Ω 1% 0603 charge current set (ERJ-3EKF3010V / C403144)	1	—	—	—	—	—	—	—	—	—	—	1
274 kΩ 1% 0603 MIC1555 U15 monostable R28 (ERJ-3EKF2743V / C403126)	1	—	—	—	—	—	—	—	—	—	—	1
715 kΩ 1% 0603 MIC1555 timer R_B (ERJ-3EKF7153V / C403339)	1	—	—	—	—	—	—	—	—	—	—	1
232 kΩ 1% 0603 thick-film eFuse UVLO (ERJ-3EKF2323V / C403086)	1	—	—	—	—	—	—	—	—	—	—	1
28.7 kΩ 1% 0603 thick-film eFuse UVLO (ERJ-3EKF2872V / C403135)	1	—	—	—	—	—	—	—	—	—	—	1
210 Ω 0.1% 0603 thin-film eFuse ILIM (ERA-3VEB2100V / C1861624)	1	—	—	—	—	—	—	—	—	—	—	1
86.6 kΩ 1% 0603 thick-film SYNC FSET resistor (ERJ-3EKF8662V / C403381)	1	—	—	—	—	—	—	—	—	—	—	1
82.0 kΩ 1% 0402 thick-film SYNC phase-delay R_DLY (ERJ-2RKF8202X / C400641)	1	—	—	—	—	—	—	—	—	—	—	1
30.1 kΩ 0.1% 0603 thin-film supercap BACKUP R_TOP (ERA-3ARB3012V / C1728516 — see DEC-030)	1	—	—	—	—	—	—	—	—	—	—	1
10.0 kΩ 0.1% 0603 thin-film supercap BACKUP R_BOT (ERA-3ARB103V / C465746)	1	—	—	—	—	—	—	—	—	—	—	1
33.2 kΩ 1% 0402 thick-film LTC3350 RT freq-set (ERA-2AEB3322X / C2087909)	1	—	—	—	—	—	—	—	—	—	—	1
0 Ω 0603 bond / isolating resistor (ERJ-3GEY0R00V / C25807)	—	—	—	—	—	—	—	—	1	—	—	1
Ferrite bead 120 Ω @100 MHz 4.0 A 1206 (Laird HI1206P121R-10)	—	—	4	—	—	—	—	—	—	—	—	4
TE 1123684-7 10-pin 2.5mm BtB PM dock header	3	—	—	—	—	—	—	—	—	—	—	3
TE 1-1674231-1 10-pin 2.5mm BtB PM dock receptacle	—	3	—	—	—	—	—	—	—	—	—	3
Molex 2195620015 hybrid Stator dock plug	—	—	2	—	—	—	—	—	—	—	—	2
Molex 2195630015 hybrid Stator dock receptacle	—	2	—	—	—	—	—	—	—	—	—	2
ERM8-005 10-pin Samtec Male Header 0.8 mm (Rotor interface)	—	—	—	—	—	2	60	2	2	—	—	64
ERF8-005 10-pin Samtec Female Socket 0.8 mm (Rotor interface)	—	—	2	—	—	2	60	—	2	—	—	64
ERM8-010 20-pin Samtec Male Header 0.8 mm (ENC data)	—	—	—	—	—	1	30	1	1	—	—	32
ERF8-010 20-pin Samtec Female Socket 0.8 mm (ENC data)	—	—	1	—	—	1	30	—	1	—	—	32
Adam Tech PH1-07-UA — 1×7 2.54mm male pin header, Rotor Board A H_SW3 (Mouser 737-PH1-07-UA; DigiKey 2057-PH1-07-UA-ND; JLCPCB C3331618)	—	—	—	—	—	1	30	—	—	—	—	30
Adam Tech RS1-07-G — 1×7 2.54mm female socket, Rotor Board B H_SW3 (Mouser 737-RS1-07-G; DigiKey 2057-RS1-07-G-ND; JLCPCB C3321543)	—	—	—	—	—	1	30	—	—	—	—	30
Amphenol T821126A1S100CEU — 26-pin 2×13 shrouded box header, 2.54mm (RS-Online 832-3503; JLCPCB C3013501)	—	—	6	1	6	—	—	—	—	—	—	12
Adam Tech BHR-16-VUA — 16-pin 2×8 shrouded box header, 2.54mm (Mouser 737-BHR-16-VUA; DigiKey 2057-BHR-16-VUA-ND; JLCPCB C17692295)	—	—	1	—	—	—	—	1	2	—	—	4
Adam Tech PH1-05-UA — 1×5 2.54mm male pin header, JDB J1/Rotor H_PWR+H_JTAG(BrdB)+H_SENS(BrdA) (Mouser 737-PH1-05-UA; DigiKey 2057-PH1-05-UA-ND; JLCPCB C5374051)	—	—	—	—	—	3	90	—	—	1	—	91
Adam Tech RS1-05-G — 1×5 2.54mm female socket, CTL J_JDB_PWR/Rotor H_PWR+H_JTAG(BrdA)+H_SENS(BrdB) (Mouser 737-RS1-05-G; DigiKey 2057-RS1-05-G-ND; JLCPCB C3321119)	—	1	—	—	—	3	90	—	—	—	—	91
Adam Tech PH1-10-UA — 1×10 2.54mm male pin header, JDB J2 JTAG OUTPUT (Mouser 737-PH1-10-UA; DigiKey 2057-PH1-10-UA-ND; JLCPCB C3330527)	—	—	—	—	—	—	—	—	—	1	—	1
Adam Tech RS1-10-G — 1×10 2.54mm female socket, Controller J_JDB_JTAG (Mouser 737-RS1-10-G; DigiKey 2057-RS1-10-G-ND; JLCPCB C3320525)	—	1	—	—	—	—	—	—	—	—	—	1
USB 3.0 Type-A Dual-Stack (Molex 48406-0003)	—	1	—	—	—	—	—	—	—	—	—	1
HDMI Type-A Full-Size (TE 2007435-1)	—	1	—	—	—	—	—	—	—	—	—	1
USB-C SMT Receptacle 6-pos (GCT USB4135-GF-A)	1	—	—	—	—	—	—	—	—	—	—	1
RJ45 MagJack (Würth 7499111121A)	—	1	—	—	—	—	—	—	—	—	—	1
Battery Connector 5-pin Micro-Fit 3.0 (Molex 43650-0519)	1	—	—	—	—	—	—	—	—	—	—	1
12 MHz Crystal SMD(Abracon ABM8-12.000MHz-B2-T / C596894)	—	—	—	—	—	—	—	—	—	1	—	1
72°C SMD Thermal Cutoff (Bourns AC72ABD / C17468669)	1	—	—	—	—	—	—	—	—	—	—	1
CR2032 Coin Cell Holder (Keystone 3034TR)	—	1	—	—	—	—	—	—	—	—	—	1
Würth 9774040151R M2.5 × 4.0mm SMT Brass Standoff (CM5 mount)	—	4	—	—	—	—	—	—	—	—	—	4
PoE ACF Isolation Transformer (Coilcraft POE600F-12L)	—	1	—	—	—	—	—	—	—	—	—	1
EMI Common-Mode Choke (Würth WE-CMBNC 7448031002)	2	—	—	—	—	—	—	—	—	—	—	2
DM Filter Inductor 10 µH 15.5 A (Bourns SRP1265A-100M)	1	—	—	—	—	—	—	—	—	—	—	1
Power Module RGB Metal Power Switch (Adafruit 4660)	1	—	—	—	—	—	—	—	—	—	—	1
Power Module Momentary RGB Metal Pushbutton (Adafruit 3350)	1	—	—	—	—	—	—	—	—	—	—	1
Power Module 2.8 mm PCB Male Quick-Fit Tabs (Keystone 1211; SW1 + SW2 harnesses)	12	—	—	—	—	—	—	—	—	—	—	12
Settings Board SPDT Toggle Switch (E-Switch 200MSP1T2B4M2QE)	—	—	—	—	—	—	—	—	—	—	12	12
Settings Board Discrete RGB LED (Kingbright WP154A4SEJ3VBDZGW/CA)	—	—	—	—	—	—	—	—	—	—	12	12
Green SMD LED 0402 (Würth 150060VS75000 / C6848499)	—	—	—	1	6	—	—	—	—	—	—	6
6.35 mm PCB Blade Terminal (Keystone 1285-ST)	—	—	—	64	384	—	—	—	—	—	—	384
CTS 219-4LPST — 4-pos DIP switch, 2.54mm THT	—	—	—	—	—	—	—	—	—	—	—	0
CTS 219-6LPSTR — 6-pos DIP switch, 2.54mm THT	—	—	—	—	—	3	90	—	—	—	—	90

Off-board plugboard jack sockets and keyboard switches are assembly-level items rather than PCB-fitted board BOM lines. See §4a for their static counts: 64 jacks per plugboard pass (128 system total) and 40 switches per Keyboard Assembly (40 system total).

1. Critical Spares (MOQ Recommendations)

• Bourns AC72 TCO: Order 5 (MOQ) - (2x Spares).
• Abracon ADCR-T02R7SA256MB (25F/2.7V) Supercap: Order 12 — 8 required per build + 4 spare/test. Source via DigiKey (535-ADCR-T02R7SA256MB-ND) or Mouser (815-ADCRT02R7SA256MB). JLCPCB global sourcing only.
• TE 1123684-7 / 1-1674231-1 PM dock set: Order 8 total — 3 PM headers + 3 Controller receptacles + 2 spares / fit-check samples.
• Molex 2195620015 / 2195630015 Stator dock set: Order 6 total — 2 Stator plugs + 2 Controller receptacles + 2 spares / fit-check samples.
• Samtec ERM8 / ERF8 rotor-family connectors: Order per Rotor / Reflector / Extension quantities only. The Controller ↔ Power Module dock uses TE parts and the Controller ↔ Stator dock uses Molex hybrid parts.
• 0.1% Thin-Film Resistors: Order 50 (MOQ) - (High attrition risk).

2. Common Passives

• 0.1uF Decoupling: Samsung CL05B104KB5NNNC (0402).
• 10uF Bulk: Samsung CL31B106KBHNNNE (1206).
• 10k Pull-ups: Panasonic ERJ-3EKF1002V (0603).

3. Logic Passives (0603 1% Thick-Film unless otherwise noted)

• 4.7kΩ: 10 units (I2C-1 Telemetry Bus).
• 10kΩ: 10 units (Reset, Battery Presence pull-ups to 3V3_ENIG & ROTOR_EN pull-down to GND).
• 22Ω: 10 units (JTAG end-of-chain damping — Reflector R1 × 1; spares).
• 121kΩ: 5 units (TPS2372-4 RMPS — MPS current set, R13).
• 301Ω: 5 units (LTC3350 RICHARGE — charge current set, R11).
• 10mΩ / 5A (2512 Kelvin): 3 build + 3 spares (PM R12 LTC3350 RSENSE + PM R23 INA219 U12 + Stator R1 INA219 U2; Bourns CSS2H-2512R-R010ELF).

3a. EMI Filter Passives

Ref	Component	Part	Value	Package	Mouser Part #
L1	EMI Primary CMC (broadband CM)	Würth WE-CMBNC 7448031002	2mH, 10A, nanocrystalline	THT 24×17×25mm	710-7448031002
L2	EMI Secondary CMC (HF, >10MHz)	Würth WE-CMBNC 7448031002 (replaces discontinued Laird CM5022)	2mH, 10A, nanocrystalline	THT 24×17×25mm	710-7448031002
L3	EMI DM Pi-filter Inductor	Bourns SRP1265A-100M	10µH, 15.5A Isat, DCR 16.5mΩ	13.5×12.5×6.2mm SMT	652-SRP1265A-100M; alt: Farnell ~2741 in stock
C1-C4	Pi-filter bulk cap bank (C1/C2 at filter input, C3/C4 at filter output)	Samsung CL32B226KAJNNNE	22µF 25V X7R	1210	187-CL32B226KAJNNNE
C5-C8, C9-C12, C13-C15	Power-stage 22µF bulk caps (buck inputs, eFuse input/output, LDO output, backup bank)	Samsung CL32B226KAJNNNE	22µF 25V X7R	1210	187-CL32B226KAJNNNE
C16-C19	LMQ61460-Q1 buck output bulk caps	TDK CGA9N3X7R1E476M230KB	4× 47µF 25V X7R MLCC total (2 fitted at U2A OUT, 2 fitted at U2B OUT)	810-A9N3X7476M23KB	445-174773-1-ND
C20	LDO input cap (U7 VIN)	Kemet C1206C106K3RACTU	10µF 25V X7R	1206	80-C1206C106K3R
C21-C23	1µF caps (Pi-filter mid-frequency legs and U11 timer)	Kemet C0805C105K5RACTU	1µF 50V X7R	0805	80-C0805C105K5R
C24-C39	100nF caps (Pi-filter HF legs and IC VCC bypass network)	Samsung CL05B104KB5NNNC	100nF 50V X7R	0402	187-CL05B104KB5NNNC
C40	SYNC SW-ringing low-pass filter (C_F1)	Kemet C0402C101K3RACAUTO	100pF X7R 25V	0402	80-C0402C101K3RAUTO
C41	SYNC 180° phase delay capacitor (C_DLY)	Samsung CL10B223KB8WPNC	22nF X7R 25V	0603	187-CL10B223KB8WPNC
C42	U15 MIC1555 one-shot timing cap	Yageo CC1206KKX7R8BB106	10µF 16V X7R	1206	603-CC126KKX7R8BB106
CTL C24	Controller PoE front-end TPS23730 soft-start cap (U10 C_SS)	Samsung CL05B103KB5NNNC	10nF 50V X7R	0402	187-CL05B103KB5NNNC

Pi-filter performance summary (f_c = 7.5kHz):

• −52dB DM attenuation at 150kHz (EN 55032 Class B lower edge) ✓
• −57dB at 200kHz (TPS23730 ACF switching frequency) ✓
• −69dB at 400kHz (LMQ61460AFSQRJRRQ1 buck switching frequency) ✓

4. Board-to-Board Interconnects

• TE 1123684-7: Power Module dock header (J1/J2/J3 on PM side).
• TE 1-1674231-1: Controller-side mating receptacle for the PM dock (J1/J2/J3).
• Molex 2195620015: Stator-side hybrid dock plug (J11/J12).
• Molex 2195630015: Controller-side mating receptacle for the Stator hybrid dock (J4/J5).
• Samtec ERM8-010-05.0-S-DV-K-TR (Male, 20-pin): Rotor J3, Reflector J3, Extension J3. JLCPCB: C374877
• Intel EPM240T100I5N: 6 units (Encoder Module ×1 per board ×6 boards = 6). DigiKey: 544-2276-ND · Mouser: 989-EPM240T100I5N · JLCPCB: C40067.
• Intel EPM570T100I5N: 31 units (Stator ×1, Rotor ×1 per board ×30 boards = 30; total 31). Same TQFP-100 footprint as EPM240; 570 LEs required for startup-loaded cipher/reflector map registers. DigiKey: 544-2281-ND · Mouser: 989-EPM570T100I5N · JLCPCB: C27319.

4a. Encoder Module — Plugboard Jacks, Keyboard Switches & PCB Spade Terminals

Ref	Component	Part / Description	Qty	Supplier	Supplier Ref / Notes
J1 (×64 per plugboard pass)	Stecker jack sockets	6.35mm (¼″) mono switched panel-mount jack — Tip + Switch: decode-role Encoder Module line; Sleeve: paired encode-role Encoder Module line. Already purchased.	64 per pass	SaiBuy.Ltd (eBay)	eBay item 334364197440 — £1.66/unit (sold in packs of 3 for £4.99). ebay.co.uk — SaiBuy.Ltd. See pseudo datasheet in design/Datasheets/SaiBuy_Ltd_6p35mm_Mono_Jack_Pseudo_Datasheet.md.
SW1-40	Keyboard switches	uxcell-style DPDT 6-pin momentary push button — Pole 1 electrically active: COM1+NO1 → key-press to CPLD. Pole 2 pins soldered for mechanical key anchoring only (no electrical connection). NC1 not connected. Keys connect to the KBD_ENC module only. Already purchased.	40 total	gadgetskingdom (eBay)	Sold in packs of 2. eBay item 365271584375. Listing title: "Momentary Push Button Switch DPDT 2 Pole 6 Pin 1 Position 2pcs". See pseudo datasheet in design/Datasheets/.
BT1-64	PCB blade terminals — generic 64-line Encoder Module I/O bank	Keystone 1285-ST — 6.35mm (0.250″) straight vertical PCB-mount male blade tab, through-hole. Used as either decode-role outputs or encode-role inputs depending on module role.	64 per module	Mouser / DigiKey / JLCPCB	Mouser: 534-1285-ST · DigiKey: 36-1285-ST-ND · JLCPCB: C5370868

Notes:

• Plugboard jacks (J1 ×64 per pass): mount in the plugboard panel. Each jack connects between one decode-role Encoder Module and one paired encode-role Encoder Module within the same pass.
• Keyboard switches (SW1-40): mount in the keyboard panel. The physical HID layout uses 40 switches total: 38 printable positions ([a-z0-9+=]) plus Left Shift and Right Shift. These wire only to the KBD_ENC module.
• Total PCB blade terminals: 64 per Encoder Module, 384 system-wide — all Keystone 1285-ST.
• Stecker patch cables (plugboard) use 6.35mm mono jack plugs (TS) — not included in BOM; customer-supplied.

4b. Stator Board — Panel Switch Configuration Components

Ref	Component	Value	Package	Mouser Part #	DigiKey Part #	JLCPCB Part #	Conf
R16–R19	SW1[0:3] CPLD config input pull-down resistors (×4)	10kΩ 1% 0603	0603	667-ERJ-3EKF1002V	P10.0KHCT-ND	C191124	🔒
R20	STATOR_CFG_RDY input pull-down (×1)	10kΩ 1% 0603	0603	667-ERJ-3EKF1002V	P10.0KHCT-ND	C191124	🔒
R21–R26	SW2[0:5] CPLD config input pull-down resistors (×6)	10kΩ 1% 0603	0603	667-ERJ-3EKF1002V	P10.0KHCT-ND	C191124	🔒

Pull-down resistors R16–R26 are retained on the Stator CPLD config input pins as power-up safe defaults (hold all inputs LOW when U_EXP4 is uninitialised). Physical switches SW1 and SW2 have been removed and relocated to the Settings Board. See Settings_Board/Design_Spec.md for the full switch specifications and Stator/Design_Spec.md §3 Panel Switch Configuration for the configuration tables.

4c. Stator Board — Virtual Keyboard / Key Injection Components

Ref	Component	Value	Package	Mouser Part #	DigiKey Part #	JLCPCB Part #	Conf
U_EXP1, U_EXP2	MCP23017 I²C GPIO Expander (×2)	MCP23017T-E/SO	SOIC-28	579-MCP23017T-E/SO	MCP23017T-E/SOCT-ND	C47023	🔒
U_EXP4	MCP23017 I²C GPIO Expander (CPLD config output driver)	MCP23017T-E/SO @ 0x22	SOIC-28	579-MCP23017T-E/SO	MCP23017T-E/SOCT-ND	C47023	🔒
U_EXP3	PCA9685 I²C PWM Driver	PCA9685BS/3	SSOP-28	771-PCA9685BS3118	PCA9685BS/3,118CT-ND	C18805	🔒
J_SERVO	Servo connector (3-pin JST PH 2.0mm)	JST B3B-PH-K-S(LF)(SN)	THT	306-B3BPHKSLFSNP	455-1705-ND	C131339	🔒
J_CFG	Settings Board I²C connector (6-pin JST PH 2.0mm)	JST B6B-PH-K-S(LF)(SN)	THT	306-B6B-PH-K-SLFSN	455-1708-ND	C131342	🔒
SW3	SERVO_HOME homing switch (SPST NO momentary, PCB-mount)	Omron SS-01GL13	THT	653-SS-01GL13	SS-01GL13-ND	—	🔒

U_EXP1 @ 0x20: ENC_IN/ENC_OUT monitoring. U_EXP2 @ 0x21: virtual keypress injection, SOURCE_SEL, SYS_RESET_N, servo control. U_EXP4 @ 0x22: CPLD config output driver (SW1[0:3] + SW2[0:5] + STATOR_CFG_RDY). U_EXP3 @ 0x60: servo PWM (Ch0 = 50Hz). J_CFG (6-pin JST PH) connects to Settings Board J_I2C and carries 3V3_ENIG, 5V_MAIN (used as the Settings indicator rail), 2× GND, SDA, SCL.

Note: The servo motor itself (Miuzei Metal Gearbox 90) is a purchased item (Amazon, already purchased). It is not in the electronic BOM.

4d. Settings Board

The Settings Board replaces the Stator DIP switches with user-accessible panel-mount toggle switches plus discrete RGB indicator LEDs. See Settings_Board/Design_Spec.md for the full design specification.

Ref	Component	Value	Package	Mouser Part #	DigiKey Part #	JLCPCB Part #	Conf
U_EXP_SW_IN	MCP23017 I²C GPIO Expander (switch input reader)	MCP23017T-E/SO @ 0x23	SOIC-28	579-MCP23017T-E/SO	MCP23017T-E/SOCT-ND	C47023	🔒
U_LED_B1	MCP23017 I²C GPIO Expander (Bank 1 LED controller)	MCP23017T-E/SO @ 0x24	SOIC-28	579-MCP23017T-E/SO	MCP23017T-E/SOCT-ND	C47023	🔒
U_LED_B2	MCP23017 I²C GPIO Expander (Bank 2 LED controller)	MCP23017T-E/SO @ 0x25	SOIC-28	579-MCP23017T-E/SO	MCP23017T-E/SOCT-ND	C47023	🔒
SW_B1_EN, SW_B1[0:3]	Bank 1 configuration toggle switches (×5: bank enable + routing bits 0–3)	E-Switch 200MSP1T2B4M2QE — SPDT latching sub-mini toggle, T2 actuator, B4 bushing, M2 termination, Q silver contacts, epoxy sealed	Panel-mount THT toggle	612-200MSP1T2B4M2QE	EG5525-ND	C5491263	✅
SW_B2_EN, SW_B2[0:5]	Bank 2 configuration toggle switches (×7: bank enable + reflector bits 0–5)	E-Switch 200MSP1T2B4M2QE — same part as Bank 1	Panel-mount THT toggle	612-200MSP1T2B4M2QE	EG5525-ND	C5491263	✅
LED_B1_EN, LED_B1[0:3]	Bank 1 discrete RGB indicator LEDs (×5)	Kingbright WP154A4SEJ3VBDZGW/CA — 5mm common-anode RGB THT LED	THT 5mm LED	604-WP154A43VBDZGWCA	754-2029-ND	C7151795	✅
LED_B2_EN, LED_B2[0:5]	Bank 2 discrete RGB indicator LEDs (×7)	Kingbright WP154A4SEJ3VBDZGW/CA — same part as Bank 1	THT 5mm LED	604-WP154A43VBDZGWCA	754-2029-ND	C7151795	✅
SW_CFG_APPLY	CFG_APPLY momentary pushbutton	Omron B3F-1070 — SPST NO through-hole tactile switch; board-mounted and mechanically actuated through enclosure	THT tactile	653-B3F-1070	SW406-ND	C726011	✅
J_I2C	I²C ribbon cable connector to Stator J_CFG	JST B6B-PH-K-S(LF)(SN) — 6-pin JST PH 2.0mm	THT	306-B6B-PH-K-SLFSN	455-1708-ND	C131342	🔒
Q_BNK1_R, Q_BNK1_G, Q_BNK1_B, Q_BNK2_R, Q_BNK2_G, Q_BNK2_B	Low-side colour-rail sink MOSFETs (×6 total; 3 per bank for RGB)	BSS138	SOT-23	512-BSS138	BSS138CT-ND	C52895	🔒
R_SW1–R_SW12	Switch input pull-down resistors (×12: 5 Bank 1 + 7 Bank 2)	10kΩ 1%	0603	667-ERJ-3EKF1002V	P10.0KHCT-ND	C191124	🔒
R_CA1	CFG_APPLY pull-up resistor	10kΩ 1%	0603	667-ERJ-3EKF1002V	P10.0KHCT-ND	C191124	🔒
R_LED_R1–R_LED_R12	Per-switch red LED series resistors (×12)	150Ω 1% — 5V operation @ 20mA nominal (Vf_red ≈ 2.0V)	0603	667-ERJ-3EKF1500V	P150HCT-ND	C400650	🔒
R_LED_G1–R_LED_G12	Per-switch green LED series resistors (×12)	100Ω 1% — 5V operation @ 20mA nominal (Vf_green ≈ 3.0V)	0603	667-ERJ-3EKF1000V	P100HCT-ND	C193336	🔒
R_LED_B1–R_LED_B12	Per-switch blue LED series resistors (×12)	100Ω 1% — 5V operation @ 20mA nominal (Vf_blue ≈ 3.0V)	0603	667-ERJ-3EKF1000V	P100HCT-ND	C193336	🔒
R_GATE1–R_GATE6	MOSFET gate resistors (×6; 1 per MOSFET)	1kΩ 1%	0402	667-ERJ-2RKF1001X	P1.00KLCT-ND	C242161	🔒
C_CA1	CFG_APPLY debounce capacitor	100nF X7R 50V	0402	187-CL05B104KB5NNNC	1276-1009-1-ND	C1525	🔒
C_U_EXP_SW_IN	VCC decoupling cap for U_EXP_SW_IN (MCP23017 @ 0x23)	100nF X7R 50V	0402	187-CL05B104KB5NNNC	1276-1009-1-ND	C1525	🔒
C_U_LED_B1	VCC decoupling cap for U_LED_B1 (MCP23017 @ 0x24)	100nF X7R 50V	0402	187-CL05B104KB5NNNC	1276-1009-1-ND	C1525	🔒
C_U_LED_B2	VCC decoupling cap for U_LED_B2 (MCP23017 @ 0x25)	100nF X7R 50V	0402	187-CL05B104KB5NNNC	1276-1009-1-ND	C1525	🔒

U_EXP_SW_IN @ 0x23: reads all 12 switch states + CFG_APPLY. U_LED_B1 @ 0x24 and U_LED_B2 @ 0x25: drive per-bit LED anodes and per-bank RGB colour-rail MOSFET sinks. All three share the Stator I²C-1 bus via the J_I2C → J_CFG ribbon cable. LEDs operate at 5V @ 20mA with 150Ω red and 100Ω green/blue series resistors. 5V_MAIN is routed from the Controller via the J4 high-current dock through the Stator to the Settings Board.

5. Controller Specifics

• CM5 Module: Raspberry Pi Compute Module 5, end-user selected multi-variant option. Any non-Lite CM5 with at least 4GB RAM and 8GB eMMC is acceptable; on-board Wi-Fi may be fitted or omitted.
• Stacked USB 3.0: Molex 48406-0003 (THT Right-Angle).
• Full HDMI: TE Connectivity 2007435-1 (THT Type-A).

5.1. Controller User I/O Protection

• TPS2065CDBVR: USB Power Distribution Switch (SOT-23-5) (1.6A Limit).
• AP2331W-7: HDMI Current Limiter (SOT-23-5) (50mA Limit).
• TPD4E05U06QDQARQ1: 4-channel ESD array, U-DFN-10. DigiKey: 296-40696-1-ND; Mouser: 595-PD4E05U06QDQARQ1; JLCPCB: C81353.

Controller Board — Power Entry Decoupling

Note: C1-C5 and C7-C11 use the common 10uF 1206 bulk capacitor defined in §2 Common Passives — not duplicated by supplier row here.

Ref	Description	Qty	Placement rule
C1-C5	5V_MAIN bulk entry decoupling bank	5	Symmetrical star/spoke entry bank at J1 5V_MAIN
C7-C11	3V3_ENIG bulk entry decoupling bank	5	Symmetrical star/spoke entry bank at J1 3V3_ENIG

Controller Board — RTC Battery Circuit

Note: C6 (100nF X7R 0402, Samsung CL05B104KB5NNNC) uses the common 100nF 0402 passive from §2 Common Passives — not duplicated here.

Ref	Component	Description	Qty	Supplier	Part Number
BT1	Keystone 3034TR	CR2032 THT horizontal coin cell holder — RTC backup battery for CM5 MXL7704 PMIC (TR = tape-reel packaging)	1	Mouser: 534-3034TR / DigiKey: 36-3034CT-ND / JLCPCB: C5213768	Keystone 3034TR
D1 (CTRL)	BAT54	SOT-23 Schottky — VBAT (Pin 76) charge blocking diode (prevents PMIC from charging CR2032)	1	Mouser: 637-BAT54 / DigiKey: 4878-BAT54CT-ND / JLCPCB: C49435667	BAT54
—	Renata CR2032	CR2032 3V coin cell (not fitted at PCB assembly — installed at commissioning)	1	Mouser: 614-CR2032 / DigiKey: P189-ND	Renata CR2032

Controller Board — Connectors & Headers

Ref	Component	Description	Mouser Part #	DigiKey Part #	JLCPCB Part #	Conf
J_DSI1	DSI1 FPC connector (15-pin 1.0mm ZIF)	Amphenol F52Q-1A7H1-11015 — DSI1 4-lane FPC/ZIF connector for optional lid-mounted touchscreen; connector is fixed even though the display add-on remains deferred; 100 Ω differential, route on L3	649-F52Q-1A7H1-11015	609-F52Q-1A7H1-11015CT-ND	C3169095	✅
J_FAN	JST SH 4-pin 1.0mm fan header	JST SM04B-SRSS-TB(LF)(SN) — 5V PWM fan connector (Pin 1 = 5V_MAIN, Pin 2 = GND, Pin 3 = TACH, Pin 4 = PWM)	306-SM04BSRSSTBLFSN	455-SM04B-SRSS-TBCT-ND	C160404	🔒

6. Backplane & Extension Components

• 16-pin Inter-Board Link (Adam Tech BHR-16-VUA, 2×8, 2.54mm): Used for J10 (Extension/Reflector link) on Stator, Extension (J7/J8), and Reflector (J4). Correct connector for TTD_RETURN path.
• See individual board BOMs: Rotor/Board_Layout.md, Stator/Board_Layout.md, Extension/Board_Layout.md, Reflector/Board_Layout.md for authoritative connector part numbers.
• Copper Shielding Tape: 50mm (2.0") Conductive Adhesive (Manual cable wrap).

7. Power & Telemetry Sensors

• INA219AIDR: 2 units — PM U12 @ I²C 0x40 (5V_MAIN current monitoring); Stator U2 @ I²C 0x45 (rotor telemetry).
• PCA9534APWR: 1 unit — PM U16 @ I²C 0x3F (status / SW1 RGB expander).
• SW2 hardware indicator logic: add 1× dual Schmitt inverter / buffer, 1× single D-type flip-flop with async clear, and 1× single 2-input AND gate. All must run from 3.3V logic and fit small-outline assembly packages.
• 20mΩ 1206 Shunt (ERJ-6ENF20R0V): 0 units — retired from Stator; replaced by CSS2H-2512R-R010ELF.
• 10mΩ 2512 Kelvin Shunt (CSS2H-2512R-R010ELF): 3 build + 3 spares — PM R12 (LTC3350 RSENSE) + PM R23 (INA219 U12, 0x40) + Stator R1 (INA219 U2, 0x45).

8. Controller Ethernet / PoE Auxiliary Subsystem

Ref	Component	Part Number	Value / Notes	Supplier	Supplier Part #	Unit Price (1-off)	Unit Price (volume)
U9	PoE PD Interface (Type 4)	TPS2372-4RGWR	TI VQFN-20; 802.3bt Type 4, external hotswap, up to 90W	Mouser	595-TPS2372-4RGWR	~£3.50	~£2.00
U10	PoE ACF DC-DC Controller	TPS23730RMTR	TI WQFN-20; ACF topology; PSR mode; 12V output set by POE600F-12L turns ratio; VS pin to aux winding	Mouser	595-TPS23730RMTR	~£3.50	~£2.00
T2	PoE ACF Isolation Transformer	Coilcraft POE600F-12L	60W; 12V out; 36–72V in; 200kHz; ACF topology; ≥1500Vrms; SMT; RoHS. Base functional MPN; D suffix is packaging-only for pick-and-place.	Coilcraft Direct / consignment	POE600F-12L	£3.54	~£1.86
R13	TPS2372-4 RMPS (MPS current set)	121kΩ 1% Thick-Film	121kΩ E96; IMPS = VIMPS/RMPS = 1.205V/121kΩ = 9.96mA (Type 4 MPS auto-stretch)	Mouser	667-ERJ-3EKF1213V	~£0.10	~£0.03

Notes:

• T2 is a Coilcraft-only consignment part — order direct from coilcraft.com. The functional base MPN is POE600F-12L; POE600F-12LD denotes packaging only.
• TPS23730 operates in PSR (Primary-Side Regulation) mode using the auxiliary winding of the POE600F-12L. No external TL431 or optocoupler required.
• TPS2372-4 uses Autoclass for automatic 4-event IEEE 802.3bt Type 4 classification; no external RCLASS resistor required. R13 (RMPS) programs MPS pulse current only.
• OR-ing priority: TPS2372-4 /PG signal drives LM74700-Q1 enable on the USB-C path to enforce PoE source priority.

9. Power / Dock IC & Connector BOM (Multi-Distributor)

Legend: ✓ = confirmed from distributor search · ~ = derived from manufacturer prefix convention · ⚠️ = part number issue flagged · — = not stocked / THT not assembled · 🔒 = owner-confirmed; do not change without owner approval

Designator	Part	Package	Mouser #	DigiKey #	JLCPCB #	Notes
U3	LTC3350EUHF#PBF	QFN-38 5×7	584-LTC3350EUHF#PBF ✓	505-LTC3350EUHF#PBF-ND ✓	C580711	🔒 ~4.5k in stock Mouser (tube). DigiKey 505-prefix confirmed. JLCPCB C580711 confirmed.
U5	STUSB4500LQTR	QFN-24 4×4	511-STUSB4500LQTR	497-STUSB4500LQCT-ND	C506650	🔒 Primary PN: STUSB4500LQTR (lower Iq ~160µA). JLCPCB C506650 confirmed L-variant in stock. If OOS, use STUSB4500QTR as alternative (non-L variant, ~210µA Iq, pin-compatible).
U6	LM74700-Q1DCKR → LM74700QDBVRQ1	SOT-23-6 (DBV)	595-LM74700QDBVRQ1	296-LM74700QDBVRQ1CT-ND ✓	C2941042	🔒 LM74700QDBVRQ1 (DBV=SOT-23-6 package, not DCK/SC70). DigiKey 35k+ in stock. Alt T&R Mouser PN: 595-LM74700QDBVTQ1 (pin-compatible).
U8	MCP121T-450E/LB	SC70-3	579-MCP121T-450E/LB	MCP121T-450E/LBCT-ND ✓	C625189	🔒 DigiKey 2.3k in stock @ $0.53/1. SC70-3 = compact 3-pin package. Microchip prefix 579-.
U1	TPS259804ONRGER	VQFN-24 (RGE)	595-TPS259804ONRGER	296-TPS259804ONRGERCT-ND	C2878936	🔒 16.9V silicon-fixed OVLO variant. OVLO set in silicon — no external R. R3 repurposed as R_ILIM (210 Ω). PNs confirmed.
U2A/U2B	LMQ61460AFSQRJRRQ1	VQFN-HR (RJR) 14-pin 4×3.5mm	595-Q61460AFSQRJRRQ1	296-LMQ61460AFSQRJRRQ1CT-ND	C1518767	🔒 AEC-Q100 automotive-qualified (Q1), VQFN-HR RJR 14-pin 4×3.5mm. ✓
U4	TPS25751DREFR	WQFN-38 6×4mm	595-TPS25751DREFR	296-TPS25751DREFRCT-ND	C30169739	🔒 ✅ Replaces NRND TPS25750DRCR (see DEC-012). PD3.1 certified (USB-IF TID#10306). Package: WQFN-38 6×4mm (note: different from TPS25750 QFN-28).
U7	TPS75733KTTRG3	TO-263 (KTT) 5-pin 10.16×15.24mm	595-TPS75733KTTRG3	296-50559-1-ND	C3749924	🔒 Fixed 3.3V, TO-263 KTT 5-pin. Active-LOW EN (EN LOW = enabled). ✓
U16	PCA9534APWR	TSSOP-16	595-PCA9534APWR	296-21760-1-ND	C2871127	🔒 PM-local 8-bit I²C GPIO expander at 0x3F. Inputs: POE_STAT, SYS_FAULT, BATT_PRES_N, USB_STAT. Outputs: SW_LED_R/G/B, SW_LED_CTRL.
U17	SN74LVC2G14DBVR	SOT-23-6	595-SN74LVC2G14DBVR	296-13010-1-ND	C12401	PM SW2 hardware signal conditioner. Dual Schmitt-trigger inverter, 1.65–5.5V supply, push-pull outputs, 5.5V-tolerant inputs.
U18	SN74LVC1G175DBVR	SOT-23-6	595-SN74LVC1G175DBVR	296-17617-1-ND	C128412	PM SW2 shutdown latch. Single D-type flip-flop with asynchronous clear, 1.65–5.5V supply, push-pull Q output, 5.5V-tolerant inputs.
U19	SN74LVC1G08DBVR	SOT-23-5	595-SN74LVC1G08DBVR	296-11601-1-ND	C7666	PM SW2 red blink gate. Single 2-input positive AND gate, 1.65–5.5V supply, push-pull output, 5.5V-tolerant inputs.
U9	TPS2372-4RGWR	VQFN-20	595-TPS2372-4RGWR (provided)	296-52795-1-ND ✓	C470955	🔒 DigiKey stock verified. $3.09/1. VQFN-20 per TI.
U10	TPS23730RMTR	WQFN-20	595-TPS23730RMTR ✓	296-TPS23730RMCT-ND ✓	C3189530	🔒 ACF PoE+ DC-DC controller; PSR mode; 12V output; WQFN-20 package. ✅ Resolved (see §9.0 item 2).
D2	TPD2E2U06DRLR	SOT-553 (DRL)	595-TPD2E2U06DRLR ✓	296-38361-1-ND ✓	C1972959	🔒 DigiKey 1.4k in stock @ $0.41/1. Dual-channel SMBus ESD, 5.5V. Part confirmed to exist. Farnell stocked (3116500).
Ethernet / PoE entry connector (Controller)	Würth 7499111121A	THT RJ45	710-7499111121A ✓	1297-1070-5-ND ✓	C5523983	🔒 Controller-owned Ethernet / PoE entry connector. Mouser ~191, DigiKey ~879 in stock. ~$8.41/1 (Mouser), ~$8.41/1 (DigiKey). Farnell out of stock. JLCPCB C5523983 — hand-place or pre-fit.
J3	Molex 0436500519 (43650-0519)	THT Micro-Fit 3.0	538-43650-0519	WM14587-ND	C563849	🔒 Full Molex PN: 0436500519; short form 43650-0519. 5-circuit, 1-row, gold contacts, board lock, 3mm pitch. Farnell ~1143 in stock. JLCPCB C563849 confirmed.
J4	GCT USB4135-GF-A	SMT vertical 8.94×3.5mm	640-USB4135-GF-A	2073-USB4135-GF-ACT-ND	C5438410	🔒 6-position USB Type-C receptacle (power only), 5A VBUS, CC1/CC2 included. Connects to STUSB4500 (U5) for 15V PD negotiation. JLCPCB C5438410.
Q1, Q2, Q3	TI CSD17483F4T (×3)	SON-8 3.3×3.3mm	595-CSD17483F4T	296-37781-1-ND	C2871105	🔒 N-ch MOSFET, 30V, 10A, 8.4mΩ. Driven by LM74700-Q1 controllers U6a/U6b/U6c for triple-input ideal-diode OR-ing (PoE / USB-C / Battery). One controller + one MOSFET per input path.
R14, R15	Panasonic ERA-3ARB series	0603 0.1% Thin-Film	See PN below	See PN below	—	🔒 R14 (ERA-3ARB3012V, Mouser 667-ERA-3ARB3012V, DigiKey 10-ERA-3ARB3012VCT-ND, JLCPCB C1728516). R15 (ERA-3ARB103V, Mouser 667-ERA-3ARB103V, DigiKey P10KBDCT-ND, JLCPCB C465746). BACKUP pin voltage divider for LTC3350 (U3). R14=30.1kΩ, R15=10.0kΩ. Sets BACKUP trigger at 4.812V (312mV above MCP121T 4.50V — see DEC-030).
R30	ERA-2AEB3322X 33.2kΩ 1% 0402	0402 1% Thick-Film	667-ERA-2AEB3322X	P33.2KDCCT-ND	C2087909	🔒 LTC3350 RT frequency-setting resistor — sets 400 kHz switching frequency (vs default 200 kHz with RT=INTVCC). Required for ≥4-cycle backup switchover window. See DEC-030.
U11	MIC1555YM5-TR	SOT-23-5	998-MIC1555YM5TR	576-2576-1-ND	C145373	🔒 CMOS timer IC (Microchip). 1Hz hardware status LED oscillator. R16=10kΩ (ERJ-3EKF series), R17=715kΩ (ERJ-3EKF7153V, Mouser 667-ERJ-3EKF7153V), C23=1µF (same Kemet C0805C105K5RACTU as C21/C22).
U15	MIC1555YM5-TR	SOT-23-5	998-MIC1555YM5TR	576-2576-1-ND	C145373	🔒 CMOS timer IC (Microchip). Monostable one-shot for hardware PWR_BUT shutdown. t=1.1×R28×C42=3.01s. R28=274kΩ (ERJ-3EKF2743V), C42=10µF 16V X7R (CC1206KKX7R8BB106), C38=100nF bypass cap.
R18–R21	RJ45 Bob Smith termination resistors (×4) — 75Ω ±1% 0402	0402	667-ERJ-2RKF75R0X	P75.0LCT-ND	C413061	🔒
CTL C25	RJ45 Bob Smith termination capacitor — 10nF 100V X7R 0402 (⚠️ Y1-class 0402 is rare; 100V X7R acceptable proxy for EMC transient margin — Ethernet ESD discharge path to chassis)	0402	80-C0402C103K1RAUTO	399-C0402C103K1RACAUTOCT-ND	C19862710	🔒

9.0. Part Number Issues Requiring Action

1. U6 — Replace LM74700-Q1DCKR with LM74700QDBVRQ1 everywhere in schematics and BOM. The DCK (SC70) package does not exist for this part; DBV (SOT-23-6) is the correct package.
2. U10 — ✅ Resolved: TPS23730 correct package is RMTR (WQFN-20) — MPN updated to TPS23730RMTR in BOM and Design_Spec.
3. U1 — Updated to TPS259804ONRGER (16.9V silicon-fixed OVLO VQFN-24 variant). Mouser/DigiKey/JLCPCB PNs confirmed. R3 repurposed as R_ILIM = 210 Ω (ERA-3VEB2100V, 0.1% thin-film).
4. U4 — Replaced with TPS25751DREFR (WQFN-38 6×4mm). See DEC-012. Package differs from TPS25750 QFN-28; KiCad symbol/footprint to be created at schematic capture.

10. Suppliers

Reference information for placing orders with key component suppliers.

#	Supplier	Role	Website	Notes
S01	Mouser Electronics	Global distributor (primary)	mouser.co.uk	Free next-day delivery on orders over £50. Wide TI/ADI/Microchip stock. Use part numbers from Mouser Part # column in board BOM tables.
S02	Farnell	Global distributor (secondary UK)	uk.farnell.com	Same-day dispatch for most stock lines. Good for Samtec, Würth, Bourns, Coilcraft.
S03	DigiKey	Global distributor (USA-based, fast to UK)	digikey.co.uk	Good for ADI (LTC3350), TI (low-MOQ), STMicroelectronics (STUSB4500).
S04	Coilcraft	Transformer / inductor manufacturer	coilcraft.com	Order T2 (POE600F-12L; D suffix = packaging only) direct from Coilcraft. Treat as a consignment part. Minimum order 1 unit. Sample requests available. UK-friendly shipping.
S05	Texas Instruments	IC manufacturer (TI store)	ti.com/store	For TI parts (TPS2372-4, TPS23730, TPS25980, LMQ61460AFSQRJRRQ1, LM74700-Q1, TPS25751DREFR, TPS75733). Samples available via ti.com.
S06	Analog Devices (ADI)	IC manufacturer	analog.com	For LTC3350 supercap manager. Samples available.
S07	STMicroelectronics	IC manufacturer	st.com	For STUSB4500 USB-C sink controller. Samples and eval kits available.
S08	Samtec	Connector manufacturer	samtec.com	For ERF8/ERM8 rotor-family BtB connectors only (Rotor / Reflector / Extension interfaces). Order direct or via Farnell/Mouser.
S09	Würth Elektronik	Passive / connector manufacturer	we-online.com	For RJ45 MagJack (7499111121A), EMI chokes (WE-CMBNC). Order via Farnell, Mouser, or direct.
S10	Molex	Connector manufacturer	molex.com	For battery connector (43650-0519 Micro-Fit 3.0, 5-pin vertical THT). Order via Mouser or DigiKey.
S11	Abracon	Passive component manufacturer	abracon.com	For ADCR-T02R7SA256MB 25F/2.7V supercaps. Available from DigiKey (935 in stock) and Mouser. JLCPCB global sourcing only.
S12	JLCPCB	PCB fabrication & SMT assembly	jlcpcb.com	Primary PCB manufacturer. Use JLCPCB Part # column for SMT assembly BOM upload. Stackup: JLC04161H-7628 (4-layer, 2oz) for JDB, Stator, Encoder, Rotor, Reflector, Extension; JLC06161H-2116 (6-layer, 2oz) for Power Module and Controller.
S13	Newark (Avnet)	Global distributor (UK stock)	newark.com	Good for Würth passives with immediate UK stock. Note: WE-CMBNC 7448031002 is not stocked by Newark/Avnet — use Mouser (710-7448031002), DigiKey (732-5584-ND), or JLCPCB (C1519839). Same-group as Farnell/element14.

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11. Datasheet Links

Product page links for all major components for design review and procurement verification.

Ref	Part / Description	Manufacturer	Local Datasheet
U1	TPS259804ONRGER — eFuse 16.9V silicon-fixed OVLO	Texas Instruments	TPS25980-datasheet.pdf
U2A, U2B	LMQ61460AFSQRJRRQ1 — 6A Sync Buck (AEC-Q100)	Texas Instruments	lmq61460-q1-datasheet.pdf
U3	LTC3350EUHF#PBF — Supercap Manager / Charger / Backup	Analog Devices	ltc3350-datasheet.pdf
U4	TPS25751DREFR — USB PD 3.1 DRP Controller	Texas Instruments	tps25751-datasheet.pdf
U5	STUSB4500LQTR — USB-C Sink PD Controller	STMicroelectronics	stusb4500l-datasheet.pdf
U6	LM74700QDBVRQ1 — Ideal-Diode OR-ing Controller	Texas Instruments	lm74700-q1-datasheet.pdf
U7	TPS75733KTTRG3 — 3.3V 3A LDO (3V3_ENIG)	Texas Instruments	tps757-datasheet.pdf
U8	MCP121T-450E/LB — 4.50V Voltage Supervisor	Microchip Technology	MCP121-datasheet.pdf
U9	TPS2372-4RGWR — IEEE 802.3bt PoE PD Controller	Texas Instruments	tps2372-datasheet.pdf
U10	TPS23730RMTR — ACF PoE+ DC/DC Controller	Texas Instruments	tps23730-datasheet.pdf
U11, U15	MIC1555YM5-TR — CMOS Timer / LED Oscillator	Microchip Technology	MIC1555-datasheet.pdf
U12 (PM), U2 (STA)	INA219AIDR — Zero-Drift Power Monitor	Texas Instruments	INA219-datasheet.pdf
U16 (PM)	PCA9534APWR — 8-bit I²C GPIO Expander	Texas Instruments	pca9534a-datasheet.pdf
U13, U14	SN74LVC1G14DBVRQ1 — Single Schmitt Inverter	Texas Instruments	sn74lvc1g14-q1-datasheet.pdf
U2 (CTL)	TPS2065CDBVR — USB Power Switch 1.6A	Texas Instruments	tps2065c-datasheet.pdf
U3 (CTL)	AP2331W-7 — HDMI Current Limiter	Diodes Inc.	AP2331-datasheet.pdf
D3 (PM); U4-U6 (CTL)	TPD4E05U06QDQARQ1 — 4-Channel ESD Array	Texas Instruments	tpd4e05u06-q1-datasheet.pdf
D2	TPD2E2U06DRLR — Dual 5.5V SMBus ESD	Texas Instruments	tpd2e2u06-datasheet.pdf
D1	TPD1E10B06DYARQ1 — Single-ch 10V TVS ESD, SOD-523	Texas Instruments	tpd1e10b06-q1-datasheet.pdf
C25 (CTL), C40 (PM)	C0402C103K1RACAUTO / C0402C101K3RACAUTO — KEMET automotive X7R MLCC family	KEMET	KEM_C1023_X7R_AUTO_SMD-datasheet.pdf
U1 (EXT), U5 (JDB)	SN74LVC2G125DCUR — Dual 3-State Buffer	Texas Instruments	sn74lvc2g125-datasheet.pdf
U1 (JDB)	FT232HL-REEL — USB 2.0 MPSSE Bridge	FTDI	FT232H-datasheet.pdf
U1 (ENC)	EPM240T100I5N — Intel MAX II CPLD 240 LE	Intel (Altera)	Intel_max2_cpld-handbook.pdf
U1 (STA/ROT)	EPM570T100I5N — Intel MAX II CPLD 570 LE	Intel (Altera)	Intel_max2_cpld-handbook.pdf
U2/U3/U4 (ROT)	FDC2114RGHR — 4-ch Capacitive Sensor IC ⚠️ MOQ 4500 at distributors; MOQ 2 at JLCPCB	Texas Instruments	fdc2112-datasheet.pdf (FDC2x1x family datasheet covering FDC2114)
U1 (CTL)	CM5 — Raspberry Pi Compute Module 5	Raspberry Pi Ltd	RPi-cm5-datasheet.pdf
Q1–Q3	CSD17483F4T — N-ch MOSFET 30V/10A, SON-8	Texas Instruments	csd17483f4-datasheet.pdf
Q4, Q5	BSS138 — N-ch Logic MOSFET 50V, SOT-23	onsemi	BSS138-onsemi-datasheet.pdf
BAT54	BAT54 — Schottky Diode, SOT-23	Generic / multi-source	bat54-diotec-datasheet.pdf
T2	POE600F-12L — Active Clamp Flyback Transformer (D suffix = packaging only)	Coilcraft	coilcraft-poe600f-datasheet.pdf
L1, L2	WE-CMBNC 7448031002 — Nanocrystalline CMC	Würth Elektronik	WE-CMBNC-7448031002-datasheet.pdf
L3	SRP1265A-100M — 10µH 14A Power Inductor	Bourns	srp1265a-datasheet.pdf
R12 / R_SENSE	CSS2H-2512R-R010ELF — 10mΩ Kelvin Shunt	Bourns	bourns.com/CSS2H
F1	AC72ABD — 72C SMD Thermal Cutoff	Bourns	Bourns-AC72ABD-datasheet.pdf
J1/J2/J3 (PM)	1123684-7 — 10-pin 2.5mm board-to-board dock header	TE Connectivity	TE-1123684-7-datasheet.pdf
J3 (PM)	43650-0519 — Micro-Fit 3.0, 5-pin Vertical THT	Molex	Molex-PS-43650-datasheet.pdf
J4 (PM)	USB4135-GF-A — USB Type-C SMT Receptacle, 5A	GCT	usb4135-datasheet.pdf
J6 (CTL)	48406-0003 — USB 3.0 Type-A Dual-Stack	Molex	Molex-48406-0003-datasheet.pdf
J7 (CTL)	2007435-1 — HDMI Type-A Full-Size	TE Connectivity	TE-2007435-1-datasheet.pdf
J_DSI1 (CTL)	F52Q-1A7H1-11015 — 15-pin 1.0mm right-angle ZIF/FPC connector	Amphenol	amphenol_ffc_fpc_100mm_f52q_f52r-datasheet.pdf
J_CM5_A/B (CTL)	10164227-1004A1RLF — 100-pin B2B SO-DIMM Socket 4.0mm	Amphenol	Amphenol-10164227-1004A1RLF-datasheet.pdf
J1/J2/J3 (CTL)	1-1674231-1 — 10-pin 2.5mm board-to-board dock receptacle	TE Connectivity	TE-1-1674231-1-datasheet.pdf
J4/J5 (CTL) / J11/J12 (STA)	2195630015 / 2195620015 — EXTreme Guardian HD hybrid dock pair	Molex	Molex-2195630015-datasheet.pdf
J4/J5 (CTL)	2195630015 — EXTreme Guardian HD receptacle mechanical drawing	Molex	Molex-2195630015-drawings.pdf
J11/J12 (STA)	2195620015 — EXTreme Guardian HD plug mechanical drawing	Molex	Molex-2195620015-drawings.pdf
J4/J5 / J11/J12 family	EXTreme Guardian HD product family specification	Molex	Molex-ExtremeGuardianHD-2141130000-PS-000-specification.pdf
C_SC1–8 (PM)	ADCR-T02R7SA256MB — 25F 2.7V Supercapacitor, THT Radial Can	Abracon	ADCR-T02R7S-datasheet.pdf
SW1/SW2/SW3 (ROT)	219-6LPSTR — 6-position DIP switch, 2.54mm THT	CTS	CTS-Switches-DIP-219-Series-Datasheet.pdf
J4–J9 (STA), J2 (ENC)	T821126A1S100CEU — 26-pin 2×13 shrouded box header, 2.54mm	Amphenol	TBD — datasheet to be added
J10 (STA), J4 (REF), J7/J8 (EXT)	BHR-16-VUA — 16-pin 2×8 shrouded box header, 2.54mm	Adam Tech	bhr-xx-vua-data-sheet.pdf
J1 (JDB)	PH1-05-UA — 1×5 2.54mm male pin header	Adam Tech	ph1-xx-ua-data-sheet.pdf
J2 (JDB)	PH1-10-UA — 1×10 2.54mm male pin header	Adam Tech	ph1-xx-ua-data-sheet.pdf
J_JDB_PWR (CTL)	RS1-05-G — 1×5 2.54mm female socket	Adam Tech	rs1-xx-g-datasheet.pdf
J_JDB_JTAG (CTL)	RS1-10-G — 1×10 2.54mm female socket	Adam Tech	rs1-xx-g-datasheet.pdf
H_SW3 Board A (ROT)	PH1-07-UA — 1×7 2.54mm male pin header	Adam Tech	ph1-xx-ua-data-sheet.pdf
H_SW3 Board B (ROT)	RS1-07-G — 1×7 2.54mm female socket	Adam Tech	rs1-xx-g-datasheet.pdf
SW1-40 (ENC/HID)	uxcell-style DPDT 6-pin momentary push button switch	gadgetskingdom (eBay)	Gadgetskingdom_DPDT_Keyboard_Switch_Pseudo_Datasheet.md