4 layers100 × 91.4 mm
4 layers40 × 36.8 mm
Usbserial
marmbrus/circuits- Size
- 40 × 36.8 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 33
- Pads
- 104
- Tracks, vias
- 146, 34
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Jul 2024
- Updated
- 6 Nov 2026
Overview
Usbserial is an open-source printed circuit board by marmbrus, from the marmbrus/circuits repository on GitHub. It is a 4-layer board of 40 × 36.8 mm with 27 parts on 33 nets, routed with 146 tracks and 34 vias.
It is built around the CH340C, TPS73733DCQR and USBLC6-2SC6, with the CC0603KRX7R9BB104, KT-0603R and MMBT3904 among its other parts. Its parts include 9 resistors, 8 capacitors, 3 ICs, 2 diodes and 2 transistors.
Main components
7
CH340C
SOP-16-20℃~+70℃ 2Mbps 3.3V、5V 50uA 7mA Transceiver USB 2.0 SOP-16 USB Converters ROHSWCH (Nanjing Qinheng Microelectronics)USB Converters
TPS73733DCQR
SOT-223-6-40℃~+125℃@(Tj) 1 1A 3.3V 400uA 5.5V 500mV@(1A) 58dB@(100Hz) 89.1uVrms Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-223-6 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
USBLC6-2SC6
SOT-23-60.35pF、0.8pF 100nA 150W@8/20us 15V 2 5V 6A@8/20us 6V ESD SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSUMWESD And Surge Protection (TVS/ESD)
CC0603KRX7R9BB104
0603100nF 50V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSYAGEOMultilayer Ceramic Capacitors MLCC - SMD/SMT
KT-0603R
0603-40℃~+85℃ 1.6mm x 0.8mm square LED 1.8V~2.4V 120° 20mA 300mcd 40mW 615nm~630nm 645nm Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
TYPE-C-31-M-12
SMD-30℃~+80℃ 1 10,000 cycles 16P 20V 5A 7.35mm Female Surface Mount, Right Angle Type-C SMD USB Connectors ROHSHRO ElectronicsUSB Connectors
README
readme.mdPlugins
Template Setup
Preferences -> Configure Paths...
- KICAD_USER_TEMPLATE_DIR=~/workspace/circuits/templates
Component Setup
easyeda2kicad
- github
easyeda2kicad --output ~/workspace/circuits/libraries/easyeda2kicad --full --lcsc_id=...
Schematics Editor -> Preferences -> Manage Symbol Libraries...
easyeda2kicad -> circuits/libraries/easyeda2kicad/easyeda2kicad.kicad_sym
PCB Editor -> Preferences -> Manage Footprint Libraries...
easyeda2kicad -> circuits/libraries/easyeda2kicad/easyeda2kicad.pretty
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100nF | Capacitor_SMD:C_0603_1608Metric | C401, C403, C404 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C101, C102, C103 |
| 2 | 12k | Resistor_SMD:R_0603_1608Metric | R404, R405 |
| 2 | 1k | Resistor_SMD:R_0603_1608Metric | R406, R407 |
| 2 | 470 | Resistor_SMD:R_0603_1608Metric | R402, R403 |
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R201, R202 |
| 2 | LED | LED_SMD:LED_0603_1608Metric | D401, D402 |
| 2 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q401, Q402 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R101 |
| 1 | 10nF | Capacitor_SMD:C_0603_1608Metric | C104 |
| 1 | 10uF | Capacitor_SMD:C_0603_1608Metric | C402 |
| 1 | CH340C | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U402 |
| 1 | Conn_01x06 | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J101 |
| 1 | Conn_02x02_Counter_Clockwise | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J102 |
| 1 | TPS73733DCQ_C5220270 | easyeda2kicad:SOT-223-6_L6.5-W3.5-P1.27-LS7.0-BR | U101 |
| 1 | TYPE-C-31-M-12 | easyeda2kicad:USB-C_SMD-TYPE-C-31-M-12 | USBC201 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U401 |
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Questions
How big is the Usbserial PCB?
It measures 40 × 36.8 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Usbserial use?
27 parts, built around the CH340C, TPS73733DCQR, USBLC6-2SC6 and CC0603KRX7R9BB104. 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 Usbserial KiCad files?
From the marmbrus/circuits repository on GitHub, at the commit this page was made from: the board is usbserial/usbserial.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Usbserial design in my own project?
Its repository states no licence, so its author keeps all rights: ask marmbrus before reusing the design.