2 layers46 × 38 mm
2 layers47 × 41 mm
Obd2laa
patrykbajos/obd2laaOBD2 to Logic Analyzer interface
- Size
- 47 × 41 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 24
- Pads
- 62
- Tracks, vias
- 74, 9
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 Feb 2026
- Updated
- 23 Feb 2026
Overview
Obd2laa is an open-source printed circuit board by patrykbajos, from the patrykbajos/obd2laa repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 47 × 41 mm with 13 parts on 24 nets, routed with 74 tracks and 9 vias.
It is built around the LP2985-50DBV and PESD2CAN. Its parts include 3 capacitors, 3 resistors, 3 ICs, 3 connectors and 1 diode. It belongs with the interfaces and adapters and sensors and measurement boards of this library.
Main components
2
LP2985-50DBV
SOT-23-5-40℃~+125℃@(Tj) 1 150mA 16V 30uVrms 45dB@(1kHz) 580mV@(150mA) 5V Fixed Over Current Protection、Over Temperature Protection、Enable、Short Circuit Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
PESD2CAN
SOT-23-55℃~+150℃ 1nA 2 230W@8/20us 24V 25pF 28V 41V 5A@8/20us Bidirectional ESD IEC 61000-4-2、IEC 61000-4-5 SOT-23 ESD and Surge Protection (TVS/ESD) ROHSNexperiaESD And Surge Protection (TVS/ESD)
README
README.mdobd2laa
OBD2 to logic analyzer interface through 10-pin IDC connector
Hardware
- MCP2542FD (SOIC-8) --- CAN FD transceiver
- L9637 (SOIC-8) --- K-Line / ISO-9141 transceiver
- LP2985-5.0 --- 5V LDO
- PESD2CAN (SOT-23)
Plug
Compatible with cheap plug with soldered small 8-pin PCB to OBD pins.
| Description | Plug Pin | OBDII Pin |
|---|---|---|
| J1850- | 1 | 10 |
| J1850+ | 2 | 2 |
| K-line | 3 | 7 |
| L-line | 4 | 15 |
| VBAT | 5 | 16 |
| GND | 6 | 4 5 |
| CANL | 7 | 14 |
| CANH | 8 | 6 |
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 10k | Resistor_SMD:R_0805_2012Metric | R1, R2, R6 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 1u | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 2.2u | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | IN | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Horizontal | J3 |
| 1 | L9637 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | LA | Connector_IDC:IDC-Header_2x05_P2.54mm_Horizontal | J2 |
| 1 | LP2985-5.0 | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | MCP2542FDxMF | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U2 |
| 1 | OUT | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Horizontal | J1 |
| 1 | PESD2CAN | Package_TO_SOT_SMD:SOT-23 | D1 |
Questions
How big is the Obd2laa PCB?
It measures 47 × 41 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Obd2laa use?
13 parts, built around the LP2985-50DBV and PESD2CAN. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Obd2laa KiCad files?
From the patrykbajos/obd2laa repository on GitHub, at the commit this page was made from: the board is obd2laa.kicad_pcb and its schematic obd2laa.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Obd2laa design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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