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2 layers21.6 × 13 mmBec adapter, the printed circuit board in 3D

A friend gave me some spare MatekSys Micro BEC Modules which I thought were handy to have due to their small package.

Size
21.6 × 13 mm
Copper layers
2
Thickness
1.6 mm
Parts
2
Nets
4
Pads
8
Tracks, vias
12, 0
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
10 Aug 2025
Updated
10 Aug 2025

Overview

Bec adapter is an open-source printed circuit board by picafe, from the picafe/bec-adapter repository on GitHub, published under the MIT licence. It is a 2-layer board of 21.6 × 13 mm with 2 parts on 4 nets, routed with 12 tracks and 0 vias.

Its parts include 1 IC and 1 connector. It belongs with the interfaces and adapters boards of this library.

README

README.md

A friend gave me some spare MatekSys Micro BEC Modules which I thought were handy to have due to their small package.
However, with the only connection method being the castellated edges, I wasn't able to solder wires or connectors to it easily.
The product images were also slightly misleading as they use a HASL finish rather then ENIG. This is just a basic breakout PCB that can be used to attach wires or even a 2.54mm XH JST to the board.
I recommend ordering from OSHPark (as I did) as you can get 3 high-quality PCBs shipped internationally for $2.14 USD. It is cheaper than ordering though JLCPCB/PCBWay.

Images: top-down view of two of the breakout boards, with the one on the right being soldered angled view of two of the breakout boards, with the one on the right being soldered

Parts

2
QtyValueFootprintReferences
1Conn_01x04_PinConnector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_VerticalJ1
1~custom:mateksys micro becU1

Questions

How big is the Bec adapter PCB?

It measures 21.6 × 13 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Bec adapter use?

2 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 Bec adapter KiCad files?

From the picafe/bec-adapter repository on GitHub, at the commit this page was made from: the board is bec_adapter.kicad_pcb and its schematic bec_adapter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Bec adapter design in my own project?

Its repository publishes it under the MIT 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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