4 layers16.9 × 119.4 mm
2 layers80 × 50 mm
Expander hw
AlmCoding/expander-hw1- Size
- 80 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 29
- Nets
- 60
- Pads
- 188
- Tracks, vias
- 305, 54
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 14 Mar 2024
- Updated
- 22 Nov 2025
Overview
Expander hw is an open-source printed circuit board by AlmCoding, from the AlmCoding/expander-hw repository on GitHub. It is a 2-layer board of 80 × 50 mm with 29 parts on 60 nets, routed with 305 tracks and 54 vias.
It is built around the SRDA3.3-4BTG and USBLC6-2SC6. Its parts include 9 capacitors, 8 resistors, 6 ICs, 3 connectors and 1 diode. It belongs with the STM32 boards of this library.
Main components
2
SRDA3.3-4BTG
SOIC-8-40℃~+125℃ 17.7V 1uA 3.3V 3.5V 30A@8/20us 600W IEC 61000-4-2、IEC 61000-4-5 TVS Unidirectional SOIC-8 ESD and Surge Protection (TVS/ESD) ROHSLittelfuseESD And Surge Protection (TVS/ESD)
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)
README
README.mdexpander-hw
Parts
29| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 5k1 | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4, R5, R6 |
| 5 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C3, C4, C9 |
| 4 | 10uF | Capacitor_SMD:C_0805_2012Metric | C5, C6, C7, C8 |
| 3 | SRDA3.3-4BTG | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4, U5, U6 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 2.2uH | Inductor_SMD:L_0805_2012Metric | L1 |
| 1 | 470 | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | AZ1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U3 |
| 1 | Conn_02x08_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J3 |
| 1 | Conn_ARM_JTAG_SWD_10 | Connector_PinHeader_1.27mm:PinHeader_2x05_P1.27mm_Vertical | J1 |
| 1 | ECS-2520MV-xxx-xx | Crystal:Crystal_SMD_TXC_7M-4Pin_3.2x2.5mm | X1 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | STM32U545RETxQ | Package_QFP:LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | USBLC6-2SC6 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_G-Switch_GT-USB-7010ASV | J2 |
Questions
How big is the Expander hw PCB?
It measures 80 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Expander hw use?
29 parts, built around the SRDA3.3-4BTG and USBLC6-2SC6. 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 Expander hw KiCad files?
From the AlmCoding/expander-hw repository on GitHub, at the commit this page was made from: the board is expander-hw.kicad_pcb and its schematic expander-hw.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Expander hw design in my own project?
Its repository states no licence, so its author keeps all rights: ask AlmCoding before reusing the design.
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