2 layers37 × 14 mm
2 layers52 × 20 mm
Uart to usb
kj-49/uart-to-usbUART to USB pcb
- Size
- 52 × 20 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 17
- Nets
- 63
- Pads
- 158
- Tracks, vias
- 121, 12
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 28 May 2026
- Updated
- 21 Jun 2026
Overview
Uart to usb is an open-source printed circuit board by kj-49, from the kj-49/uart-to-usb repository on GitHub. It is a 2-layer board of 52 × 20 mm with 17 parts on 63 nets, routed with 121 tracks and 12 vias.
It is built around the AP2112K-3.3 and FT4232HL. Its parts include 6 capacitors, 4 resistors, 2 ICs, 2 connectors and 1 switch. It belongs with the interfaces and adapters boards of this library.
Main components
2README
README.mdUART to USB
A simple chip that converts up to 3 UART lines to USB. Only supports one-way transmission from UART to USB.
Parts
17| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric | C2, C3 |
| 2 | 30pF | Capacitor_SMD:C_0805_2012Metric | C5, C6 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric | C4 |
| 1 | 10k | Resistor_SMD:R_0805_2012Metric | R4 |
| 1 | 10uF | Capacitor_SMD:C_0805_2012Metric | C1 |
| 1 | 12MHz | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | 12k 1% | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | AP2112K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | Conn_01x04_Pin | Connector_JST:JST_XH_S4B-XH-A_1x04_P2.50mm_Horizontal | J2 |
| 1 | FT4232H | Package_DFN_QFN:QFN-64-1EP_9x9mm_P0.5mm_EP7.5x7.5mm | U1 |
| 1 | LOGO | LOGO | G*** |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SW1 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
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Questions
How big is the Uart to usb PCB?
It measures 52 × 20 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Uart to usb use?
17 parts, built around the AP2112K-3.3 and FT4232HL. 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 Uart to usb KiCad files?
From the kj-49/uart-to-usb repository on GitHub, at the commit this page was made from: the board is FT4232HP/uart-to-usb.kicad_pcb and its schematic FT232HP/uart-to-usb.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Uart to usb design in my own project?
Its repository states no licence, so its author keeps all rights: ask kj-49 before reusing the design.