2 layers68 × 78 mm
2 layers16 × 21.5 mm
Efm8bb-20qfn
nppc/DevBoardsGeneric PCBs for different controllers
- Size
- 16 × 21.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 18
- Nets
- 21
- Pads
- 101
- Tracks, vias
- 278, 22
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 21 Sep 2025
- Updated
- 21 Sep 2025
Overview
Efm8bb-20qfn is an open-source printed circuit board by nppc, from the nppc/DevBoards repository on GitHub. It is a 2-layer board of 16 × 21.5 mm with 18 parts on 21 nets, routed with 278 tracks and 22 vias.
Its parts include 8 capacitors, 5 connectors, 2 resistors and 2 ICs. It belongs with the Silicon Labs (EFR32, EFM) boards of this library.
Parts
18| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100n | Capacitors_SMD:C_0603 | C4, C6, C8 |
| 2 | 10k | Resistors_SMD:R_0603 | R1, R3 |
| 2 | 2uf | Capacitors_SMD:C_0603 | C1, C2 |
| 2 | 4.7uf | Capacitors_SMD:C_0603 | C5, C7 |
| 2 | Conn_01x08 | Pin_Headers:Pin_Header_Straight_1x08_Pitch2.54mm | J1, J2 |
| 1 | 1uf | Capacitors_SMD:C_0603 | C3 |
| 1 | C2 | Connectors_Molex:Molex_PicoBlade_53047-0410_04x1.25mm_Straight | J6 |
| 1 | Conn_01x02 | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J3 |
| 1 | Conn_02x10_Counter_Clockwise | Housings_SSOP:TSSOP-20_4.4x6.5mm_Pitch0.65mm | J4 |
| 1 | EFM8BB51_20pin | KiCadCustomLibs:QFN20_small | U2 |
| 1 | Jumper_NC_Small | KiCadCustomLibs:Jumper_micro | JP1 |
| 1 | MIC550X-DFN | Housings_DFN_QFN:UDFN-4_1x1mm_Pitch0.65mm | U1 |
Questions
How big is the Efm8bb-20qfn PCB?
It measures 16 × 21.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Efm8bb-20qfn use?
18 parts. 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 Efm8bb-20qfn KiCad files?
From the nppc/DevBoards repository on GitHub, at the commit this page was made from: the board is Silabs/SiLabsDevBoards/efm8bb-20qfn/efm8bb-20qfn.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Efm8bb-20qfn design in my own project?
Its repository states no licence, so its author keeps all rights: ask nppc before reusing the design.
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