4 layers144.3 × 143.8 mm
2 layers85.1 × 53.9 mm
- Size
- 85.1 × 53.9 mm
- Copper layers
- 2
- Thickness
- 0.2 mm
- Parts
- 44
- Nets
- 56
- Pads
- 162
- Tracks, vias
- 487, 139
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 25 Aug 2025
- Updated
- 2 Nov 2026
Overview
Patch is an open-source printed circuit board by esl-epfl, from the esl-epfl/HEEPidermis repository on GitHub. It is a 2-layer board of 85.1 × 53.9 mm with 44 parts on 56 nets, routed with 487 tracks and 139 vias.
It is built around the 74AHC1G08GW. Its parts include 10 resistors, 8 capacitors, 6 connectors, 4 diodes and 1 IC.
Main components
1README
hw/vendor/breakout-board/README.mdParts
44| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | LOGO | LOGO | G***, G***, G***, G***, G***, G***, G*** |
| 3 | 0R | Resistor_SMD:R_0603_1608Metric | R1, R2, R3 |
| 3 | 1u | Capacitor_SMD:C_0603_1608Metric | C4, C5, Crect1 |
| 3 | 330 | Resistor_SMD:R_0603_1608Metric | R6, R7, R9 |
| 3 | Conn_01x01 | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | J1, J3, J4 |
| 3 | LED | LED_SMD:LED_0603_1608Metric | D1, D2, D3 |
| 2 | 100k | Resistor_SMD:R_0603_1608Metric | R4, R8 |
| 2 | 10u | Capacitor_SMD:C_0603_1608Metric | C6, Ctune1 |
| 2 | Conn_Coaxial_Small | libs:4mm_snap_socket | E1, E2 |
| 2 | ~ | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 1 | 100n | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | Rchg1 |
| 1 | 264-5205-01 | Package_DFN_QFN:QFN-64-1EP_9x9mm_P0.5mm_EP3.4x3.4mm | HEEPidermis1 |
| 1 | 50 | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 74AHC1G08 | Package_TO_SOT_SMD:SOT-353_SC-70-5_Handsoldering | U1 |
| 1 | Battery_Cell | Battery:BatteryHolder_Seiko_MS621F | BT1 |
| 1 | Conn_01x03 | Connector_PinHeader_1.00mm:PinHeader_1x03_P1.00mm_Horizontal | J5 |
| 1 | Conn_01x16 | Connector_PinHeader_1.00mm:PinHeader_1x16_P1.00mm_Horizontal | J6 |
| 1 | Conn_Coaxial_Small | Connector_Coaxial:U.FL_Molex_MCRF_73412-0110_Vertical | J3 |
| 1 | D_Schottky | Diode_SMD:D_0603_1608Metric | D4 |
| 1 | NMOS | Package_TO_SOT_SMD:SOT-323_SC-70_Handsoldering | Q1 |
| 1 | NetTie_2 | libs:1MHz_coil_29x14 | NT1 |
| 1 | SW_SPST | Button_Switch_SMD:SW_SPST_FSMSM | SW1 |
Questions
How big is the Patch PCB?
It measures 85.1 × 53.9 mm and has 2 copper layers, 0.2 mm thick.
What parts does the Patch use?
44 parts, built around the 74AHC1G08GW. 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 Patch KiCad files?
From the esl-epfl/HEEPidermis repository on GitHub, at the commit this page was made from: the board is hw/vendor/patch-board/patch-backups/patch-2026-08-08_174749/patch.kicad_pcb and its schematic hw/vendor/breakout-board/heepidermis-bo.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Patch design in my own project?
Its repository states no licence, so its author keeps all rights: ask esl-epfl before reusing the design.
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