6 layers190 × 140 mm
4 layers68 × 16 mm
USB UART
grkacprzak/USB-UARTindustrial grade USB-UART converter
- Size
- 68 × 16 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 46
- Nets
- 37
- Pads
- 179
- Tracks, vias
- 300, 72
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 23 May 2025
- Updated
- 23 May 2025
Overview
USB UART is an open-source printed circuit board by grkacprzak, from the grkacprzak/USB-UART repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 68 × 16 mm with 46 parts on 37 nets, routed with 300 tracks and 72 vias.
It is built around the MAX232N, FT230XQ-R and SN74LVC2T45DCURE4. Its parts include 17 diodes, 10 capacitors, 5 ICs, 4 resistors and 4 connectors. It belongs with the interfaces and adapters boards of this library.
Main components
3
MAX232N
PDIP-160℃~+70℃ 120Kbps 2 2 4.5V~5.5V Transceiver PDIP-16 RS232 ICs ROHSTexas InstrumentsRS232 ICs
FT230XQ-R
QFN-16-EP(4x4)-40℃~+85℃ 125uA 3.3V~5V 8mA USB 2.0 USB to UART QFN-16-EP(4x4) USB Converters ROHSFTDIUSB Converters
SN74LVC2T45DCURE4
VSSOP-832mA 32mA Level translator Power-off protection、Output enable high-impedance VSSOP-8 Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level Shifters
README
README.mdUSB-UART
industrial grade USB to UART converter
Parts
46| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | D_Zener | Diode_SMD:D_SOD-523 | D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17 |
| 7 | C | Capacitor_SMD:C_0402_1005Metric | C2, C5, C6, C7, C8, C9, C10 |
| 2 | 0R | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 4k7 | Resistor_SMD:R_0402_1005Metric | R5, R6 |
| 2 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J3, J4 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D1, D2 |
| 2 | SN74LVC2T45DCUR | Package_SO:VSSOP-8_2.3x2mm_P0.5mm | U3, U4 |
| 1 | 100n | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 1u | Capacitor_SMD:C_0402_1005Metric | C3 |
| 1 | 4u7 | Capacitor_SMD:C_0402_1005Metric | C1 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Horizontal | J2 |
| 1 | FT230XQ | Package_DFN_QFN:QFN-16-1EP_4x4mm_P0.65mm_EP2.1x2.1mm | U2 |
| 1 | FerriteBead | Inductor_SMD:L_0402_1005Metric | FB1 |
| 1 | MAX232 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U5 |
| 1 | USB_C_Receptacle_USB2.0_16P | all_gk_fp_Ki8:USB_C_Receptacle_Wuerth_629722000214 | J1 |
| 1 | WE-TVS-82400152 | Package_TO_SOT_SMD:SOT-563 | U1 |
The 41 most common of 46 parts.
Questions
How big is the USB UART PCB?
It measures 68 × 16 mm and has 4 copper layers, 1.6 mm thick.
What parts does the USB UART use?
46 parts, built around the MAX232N, FT230XQ-R and SN74LVC2T45DCURE4. 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 USB UART KiCad files?
From the grkacprzak/USB-UART repository on GitHub, at the commit this page was made from: the board is USB-UART.kicad_pcb and its schematic USB-UART.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the USB UART 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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