Bill of Materials
Hardware version
WTI400 v1.2 — In service — installed on test vessel
| Refs | Value | Qty | Description | Datasheet |
|---|---|---|---|---|
| U1 | LSM6DSLTR | 1 | ST 6DoF IMU, LGA-14, I²C/SPI, ±16 g / ±2000 dps | ST LSM6DSL |
| U2 | LMR51610XDBVR | 1 | TI 4–65 V / 1 A synchronous buck, SOT-23-6 | TI LMR51610 |
| U3 | ESP32-S3-WROOM-1-N16R8 | 1 | Espressif dual-core LX7 MCU, 16 MB flash, 8 MB PSRAM, Wi-Fi + BT5 LE | Espressif ESP32-S3-WROOM-1 |
| U4 | HT7833 | 1 | UMW 3.3 V LDO, SOT-89-3, 450 mA — developer variant only | UMW HT7833-A |
| U5 | SN65HVD234DR | 1 | TI CAN transceiver, 3.3 V, 1 Mbps, ISO 11898-2, SOIC-8 | TI SN65HVD234 |
| U6, U7, U8 | TLP2309 | 3 | Toshiba high-speed opto-isolator, SO-6, 3750–5000 Vrms | Toshiba TLP2309 |
| U9 | NUP2105LT1G | 1 | onsemi dual-line CAN TVS array, SOT-23, 24 V standoff | onsemi NUP2105L |
| U10, U11 | 74LVC1G17GW | 2 | Nexperia Schmitt-trigger buffer, 1.65–5.5 V, TSSOP-5 | Nexperia 74LVC1G17 |
| U12 | TLV9002IDR | 1 | TI dual RRIO op-amp, 1 MHz GBW, SOIC-8 | TI TLV9002 |
| U13 | LP2951-50DR | 1 | TI adjustable LDO, 100 mA, 30 V max, SOIC-8 | TI LP2951 |
| U14 | ZXTR2012FF | 1 | Diodes Inc. 12 V / 30 mA linear regulator, 100 V input, SOT-23F | Diodes ZXTR2012FF |
| Q1 | BC807-25 | 1 | JSMSEMI PNP BJT, 45 V / 500 mA, SOT-323 | Nexperia BC807 |
| Q2 | PMV240SPR | 1 | Nexperia P-MOSFET, 100 V / 1.2 A, SOT-23 | Nexperia PMV240SPR |
| Q3, Q8 | MMBTA56LT1G | 2 | onsemi PNP BJT, 80 V / 500 mA, SOT-23 | onsemi MMBTA56 |
| Q4, Q7 | BC847BS | 2 | Nexperia NPN dual BJT, SOT-363 | Nexperia BC847BS |
| Q5 | AO3407A | 1 | AOS P-MOSFET, 30 V / 4.2 A, SOT-23 | AOS AO3407A |
| Q6 | 2N7002 | 1 | Nexperia N-MOSFET, 60 V / 300 mA, SOT-23 | Nexperia 2N7002 |
| D1 | XL-3528RGBW-HM | 1 | XINGLIGHT SMD3528 common-anode RGB LED | LCSC C2843813 |
| D2, D14, D19 | PESD15VL1BA | 3 | Nexperia bidirectional TVS, 15 V, 200 W (8/20 µs), SOD-323 | Nexperia PESD15VL1BA |
| D3 | BZT52C7V5S | 1 | Diodes Inc. zener 7.5 V, 200 mW, SOD-323 | Diodes BZT52C |
| D4, D5, D7 | 1N5819WS | 3 | JSMSEMI Schottky, 40 V / 350 mA, SOD-323 | JSMSEMI 1N5819WS |
| D6, D17 | BAT54J | 2 | Nexperia Schottky, SOD-323F | Nexperia BAT54J |
| D8 | BZT52C15S | 1 | Diodes Inc. zener 15 V, 200 mW, SOD-323 | Diodes BZT52C |
| D9, D13 | SS34 | 2 | MSKSEMI Schottky, 40 V / 3 A, SMA | MSKSEMI SS34 |
| D10 | BZT52C3V6S | 1 | Vishay zener 3.6 V, 200 mW, SOD-323 | Vishay BZT52C |
| D11 | SM8S36CA | 1 | FUXINSEMI bidirectional TVS, 36 V, 6.6 kW (8/20 µs), DO-218AB | SMC SM8S36CA |
| D12 | BAT54S | 1 | Nexperia dual series Schottky, 30 V, SOT-23 | Nexperia BAT54S |
| D15 | SMCJ36CA | 1 | Littelfuse bidirectional TVS, 36 V, DO-214AB | Littelfuse SMCJ36CA |
| D16 | RBR3MM60BTR | 1 | ROHM Schottky, 60 V / 3 A, SOD-123FL | ROHM RBR3MM60BTR |
| D18, D20, D21, D22 | SD09C-7 | 4 | Diodes Inc. bidirectional TVS, 9 V, 400 W (8/20 µs), SOD-323F | Diodes SD09C |
| F1 | BSMD1812-050 | 1 | BHFUSE resettable PTC fuse, 500 mA hold, 60 V, 1812 | LCSC C883142 |
| L1 | FNR5040S220MT | 1 | Shielded power inductor, 22 µH, 1.6 A, 5×5 mm | LCSC C167971 |
| L2 | FHD4012S-4R7MT | 1 | Power inductor, 4.7 µH, 2.1 A, 4×4 mm | cjiang FHD4012S |
| L3 | FHD4012S-1R0MT | 1 | Power inductor, 1 µH, 3.5 A, 4×4 mm | cjiang FHD4012S |
| L4, L5, L6 | LQM18FN1R0M00D | 3 | Murata RF choke, 1 µH, 150 mA, 0603 | Murata LQM18FN1R0M00D |
| L7 | LQM18FN100M00D | 1 | Murata RF choke, 10 µH, 50 mA, 0603 | Murata LQM18FN100M00D |
| FB1, FB2, FB3 | BLM31KN601SN1L | 3 | Murata ferrite bead, 600 Ω @ 100 MHz, 1206 | Murata BLM31KN601SN1L |
| FL1 | ACT45B-510-2P-TL003 | 1 | TDK common-mode choke, 51 µH, 2800 Ω @ 10 MHz, 0.2 A, AEC-Q200 | TDK ACT45B-510-2P |
| FL2 | SMCM7060-132T | 1 | SXN common-mode filter, 1.3 kΩ @ 100 MHz, 2-winding | LCSC C381616 |
| C33, C41, C42 | 22 µF / 100 V | 3 | 2220 X7R MLCC | PSA FS55X225K251EGG |
| C2, C14, C15 | 10 µF / 50 V | 3 | 1210 X7R MLCC | Murata GRM32ER71H106KA12L |
| C1, C16, C52, C54 | 10 µF / 25 V | 4 | 0805 X7R MLCC | Murata GRM21BZ71E106KE15L |
| C36, C37 | 4.7 µF / 100 V | 2 | 1206 X7R MLCC | Murata GRM31CR72A475KA73L |
| C51 | 4.7 µF / 25 V | 1 | 0805 X7R MLCC | Murata GRM21BZ71E475KE15L |
| C39, C58 | 1 µF / 100 V | 2 | 1206 X7R MLCC | — |
| C5, C7, C38 | 1 µF / 25 V | 3 | 0603 X7R MLCC | Murata GCM188R71E105KA64D |
| C32, C34 | 100 nF / 100 V | 2 | 0603 X7R MLCC | — |
| C4, C10, C11, C17, C19, C20, C22, C23, C28, C30, C31, C35, C40, C43, C53, C55 | 100 nF / 50 V | 16 | 0603 X7R MLCC | Murata GCM188R71H104KA57D |
| C6, C12 | 100 nF / 50 V | 2 | 0603 X7R MLCC (motion sensor VDDIO) | Murata GCM188R71H104KA57D |
| C3 | 100 nF / 50 V | 1 | 0603 X7R MLCC (mid-freq VCC bypass) | Murata GCM188R71H104KA57D |
| C8, C13 | 100 pF / 50 V | 2 | 0603 C0G MLCC | Murata GRM1885C1H101JA01D |
| C24, C25, C26, C27 | 15 pF / 100 V | 4 | 0603 C0G MLCC (CAN CMC filter) | — |
| C44, C45 | 1 nF / 50 V | 2 | 0603 C0G MLCC (wind ADC anti-alias) | — |
| C46, C56 | 15 pF / 50 V | 2 | 0603 C0G MLCC | — |
| C50, C49 | 100 pF / 50 V | 2 | 0603 C0G MLCC (legacy RX LC filter) | — |
| C48 | 100 pF / 50 V | 1 | 0603 C0G MLCC (LP2951 feedforward CFF) | — |
| C9 | 1 pF / 100 V | 1 | 0603 C0G MLCC (VCC FB feedforward) | — |
| C47 | 2.2 nF / 50 V | 1 | 0603 C0G MLCC (legacy TX rise-time RC) | Murata GRM1881X0J223JA01 |
| C57 | 1 nF / 50 V | 1 | 0603 C0G MLCC (wind shield HF bypass) | — |
| C10 (SW snubber), C29 (CAN diff) | 100 nF / 50 V or 100 pF / 50 V | — | DNP — see circuit docs for conditions | — |
| R1 | 32 kΩ | 1 | 0603 thin-film ±0.1 % (VCC feedback lower) | Yageo Thin Film |
| R2, R42, R55, R65, R74 | 100 kΩ | 5 | 0603 thick-film ±1 % | Yageo RC Series |
| R3, R4, R9, R15, R16, R18, R20, R31, R41 | 10 kΩ | 9 | 0603 thick-film ±1 % | Yageo RC Series |
| R5, R7, R8 | 10 kΩ | 3 | 0603 thick-film ±1 % (LED drive / pull-ups) | Yageo RC Series |
| R19 | 2.2 kΩ | 1 | 0603 thick-film ±1 % (legacy RX pull-up) | Yageo RC Series |
| R6 | 68 kΩ | 1 | 0603 thick-film ±1 % (Q1 base bias) | Yageo RC Series |
| R10, R11 | 220 Ω | 2 | 0603 thick-film ±1 % (blue/green LED) | Yageo RC Series |
| R12 | 680 Ω | 1 | 0603 thick-film ±1 % (red LED, Q1 path) | Yageo RC Series |
| R14 | 47 Ω | 1 | 0603 thick-film ±1 % (SN65HVD234 RXD damping) | Yageo RC Series |
| R17 | 10 kΩ | 1 | 0603 thick-film ±1 % (SN65HVD234 Rs slope) | Yageo RC Series |
| R21, R23 | 390 Ω | 2 | 0603 thick-film ±1 % (legacy TX/EN opto LED limit) | Yageo RC Series |
| R22 | 100 kΩ | 1 | 0603 thick-film ±1 % (legacy TX opto output VST pull-up) | Yageo RC Series |
| R24 | 0 Ω (DNP) | 1 | 0603 zero-ohm — production variant only | Yageo RC Series |
| R25 | 4.7 Ω | 1 | 0603 thick-film ±1 % (OVP collector series) | Yageo RC Series |
| R26, R34 | 22 kΩ | 2 | 0603 thick-film ±1 % | Yageo RC Series |
| R27 | 68 kΩ | 1 | 0603 thick-film ±1 % (OVP divider lower) | Yageo RC Series |
| R28 | 2.4 kΩ | 1 | 0603 thick-film ±1 % (OVP divider upper) | Yageo RC Series |
| R29, R33 | 22 kΩ | 2 | 0603 thick-film ±1 % (legacy RX/TX ST_SIG pull-up to VST) | Yageo RC Series |
| R30 | 2.2 kΩ | 1 | 0603 thick-film ±1 % (legacy RX opto LED limit) | Yageo RC Series |
| R32 | 390 Ω | 1 | 0603 thick-film ±1 % (legacy TX EN secondary) | Yageo RC Series |
| R35, R68 | 39 kΩ | 2 | 0603 thick-film ±1 % | Yageo RC Series |
| R36, R38 | 1 MΩ | 2 | 0603 thick-film ±1 % (legacy TX high-Z bias) | Yageo RC Series |
| R37 | 30.9 kΩ | 1 | 0603 thick-film ±1 % (legacy TX gate driver) | Yageo RC Series |
| R39 | 220 mΩ | 1 | 0603 thick-film ±1 % (CAN LC input damping) | Yageo RC Series |
| R40 | 39 kΩ | 1 | 0603 thick-film ±1 % (button debounce R) | Yageo RC Series |
| R43 | 100 mΩ | 1 | 0603 thick-film ±1 % (CAN bulk ESR damping) | Yageo RC Series |
| R44, R45, R46 | 39 kΩ | 3 | 0603 thick-film ±1 % (legacy TX bias/timing) | Yageo RC Series |
| R47, R54 | 22 kΩ | 2 | 0603 thick-film ±1 % (U12 bias divider upper) | Yageo RC Series |
| R48, R53 | 68 kΩ | 2 | 0603 thick-film ±1 % (U12 bias divider lower) | Yageo RC Series |
| R49, R52 | 56 kΩ | 2 | 0603 thick-film ±1 % (U12 Rg gain) | Yageo RC Series |
| R50, R51 | 62 kΩ | 2 | 0603 thick-film ±1 % (U12 Rf feedback) | Yageo RC Series |
| R56, R70 | 2.2 kΩ | 2 | 0603 thick-film ±1 % (legacy TX output stage) | Yageo RC Series |
| R57 | 10 Ω | 1 | 0603 thick-film ±1 % (legacy TX series) | Yageo RC Series |
| R58, R59, R60, R61 | 56 kΩ | 4 | 0603 thick-film ±1 % (U12 input attenuator/shunt) | Yageo RC Series |
| R62 | 100 kΩ | 1 | 0603 thick-film ±1 % (wind speed divider lower) | Yageo RC Series |
| R63 | 150 kΩ | 1 | 0603 thick-film ±1 % (wind speed divider upper) | Yageo RC Series |
| R64 | 330 Ω | 1 | 0603 thick-film ±1 % (U11 input current limit) | Yageo RC Series |
| R66 | 1 kΩ | 1 | 0603 thick-film ±1 % (legacy TX driver bias) | Yageo RC Series |
| R67 | 390 Ω | 1 | 0603 thick-film ±1 % (Q6 gate drive) | Yageo RC Series |
| R69 | 47 Ω | 1 | 1210 thick-film ±1 %, 500 mW (legacy RX LDO_VIN pulse damping) | Yageo RC Series |
| R71 | 12 kΩ | 1 | 0603 thick-film ±1 % (legacy TX rise-time RC discharge) | Yageo RC Series |
| R72 | 120 kΩ | 1 | 0603 thick-film ±1 % (LP2951 upper feedback) | Yageo RC Series |
| R73 | 39 kΩ | 1 | 0603 thick-film ±1 % (legacy TX feedback bias) | Yageo RC Series |
| R75 | 1 MΩ | 1 | 0603 thick-film ±1 % (wind shield DC bleed) | Yageo RC Series |
| R76 | 22 kΩ | 1 | 0603 thick-film ±1 % (WIND_SPD P-line pull-up to WIND_8V) | Yageo RC Series |
| R77 | 6.2 kΩ | 1 | 0603 thick-film ±1 % (LP2951 lower feedback shunt, B&G) | Yageo RC Series |
| R78 | 20 kΩ | 1 | 0603 thick-film ±1 % (LP2951 lower feedback main) | Yageo RC Series |
| R79 | 0 Ω (DNP) | 1 | 0805 zero-ohm — factory voltage select link | — |
| SW1 | Tactile 6×6×12 mm | 1 | SPST N.O., 50 mA / 12 V, SMD | — |