10 layers180 × 100 mm
Jetson agx thor baseboard
antmicro/jetson-agx-thor-baseboard
Open hardware baseboard for Nvidia Jetson Thor AGX T5000 System on Module
1,213 parts48Apache-2.0
4 layers42.3 × 60.2 mm
MicroSD Switch Reader
will127534/microSD-Switcher-Reader25A simple USB3.0 uSD card reader with a SD card switch for SBCs
- Size
- 42.3 × 60.2 mm
- Copper layers
- 4
- Thickness
- 0.8 mm
- Parts
- 81
- Nets
- 106
- Pads
- 353
- Tracks, vias
- 998, 198
- Pours
- 14
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 5 Jul 2026
- Updated
- 5 Jul 2026
Overview
MicroSD Switch Reader is an open-source printed circuit board by will127534, from the will127534/microSD-Switcher-Reader repository on GitHub, published under the MIT licence. It is a 4-layer board of 42.3 × 60.2 mm with 81 parts on 106 nets, routed with 998 tracks and 198 vias.
It is built around the HD3SS3220IRNHR, LP5912-1.8DRV and BSS214NW-TP. Its parts include 26 capacitors, 19 resistors, 9 ICs, 6 diodes and 6 connectors.
Main components
3
HD3SS3220IRNHR
WQFN-30-EP(2.5x4.5)-40℃~+85℃ 10Gbps 2 4.5V、5.5V 5uA 900uA USB 3.1 WQFN-30-EP(2.5x4.5) USB Converters ROHSTexas InstrumentsUSB Converters
LP5912-1.8DRV
WSON-6-EP(2x2)-40℃~+125℃@(Tj) 1 1.8V 12uVrms 250mV@(500mA) 30uA 500mA 6.5V 75dB@(1kHz) Fixed PG Pin、Over Current Protection、Over Temperature Protection、Soft Start Positive WSON-6-EP(2x2) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BSS214NW-TP
SOT-323MOSFETsTECH PUBLIC
README
README.mdmicroSD-Switcher-Reader: A simple USB3.0 uSD card reader with a SD card switch for SBCs
Introduction
Basically I want some hardware that I can have agents to load images on RPI and test it all from software cmd to have it build/test RPI images for me. There has been some design out there but most of them are USB2.0 which is kinda slow so I wanna build one using USB3 SD reader, and additionally because I'm targeting RPI here, I also whould like to have USB to UART along with a GPIO to power switch on and off the RPI5.
So I have the board with GL3224 (USB3 SD card reader) and MCP2221A (USB2 to GPIO/UART/I2C), and because USB3 connector has both USB3 and USB2 signal, I have it connected to the two ICs so no USB hub needed for the two.
The board has been tested with RPI5 and GL3224 has been tested with 100 Megabytes/sec read/write speed.
Also thanks to https://github.com/NVNTLabs/switch2-SDEX2M2 from NVNTLabs for the microSD card PCB library. (It is a neet MicroSD Express to M.2 adaptor board for Switch2)
Notes
- Gerber and CPL and BOM file for JLCPCB is under /Gerber
- Interactive BOM (provided by InteractiveHtmlBom)
- Source Code for MCP2221A under /software
Support
For questions, issues, or suggestions, please open an issue in the GitHub repository
Schematic
PCB
Parts
81| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C4, C10, C11, C12, C13, C14, C15, C16, C17, C20, C21, C22, C24, C25, C26 +5 |
| 7 | 10K | Resistor_SMD:R_0402_1005Metric | R1, R8, R11, R12, R13, R16, R17 |
| 6 | 470R | Resistor_SMD:R_0402_1005Metric | R2, R6, R7, R9, R10, R19 |
| 6 | LED | LED_SMD:LED_0603_1608Metric | D1, D2, D3, D4, D5, D6 |
| 6 | TestPoint | TestPoint:TestPoint_Pad_D1.0mm | TP1, TP2, TP3, TP4, TP5, TP6 |
| 5 | BSS214NW | Package_TO_SOT_SMD:SOT-323_SC-70 | Q1, Q2, Q3, Q4, Q5 |
| 3 | 1K | Resistor_SMD:R_0402_1005Metric | R3, R4, R18 |
| 3 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3 |
| 2 | 12pF | Capacitor_SMD:C_0402_1005Metric | C2, C3 |
| 2 | 1uF | Capacitor_SMD:C_0402_1005Metric | C18, C19 |
| 2 | SiP32431DR3 | Package_TO_SOT_SMD:SOT-363_SC-70-6 | U5, U9 |
| 2 | TMUX1574DYYR | footprints:DYY0016A_TEX | U1, U7 |
| 1 | 200K | Resistor_SMD:R_0402_1005Metric | R15 |
| 1 | 25CSM04xxSN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U4 |
| 1 | 25Mhz | Crystal:Crystal_SMD_2520-4Pin_2.5x2.0mm | Y1 |
| 1 | 680R | Resistor_SMD:R_0402_1005Metric | R5 |
| 1 | 900K | Resistor_SMD:R_0402_1005Metric | R14 |
| 1 | Conn_01x02_MountingPin | Connector_Molex:Molex_PicoBlade_53261-0271_1x02-1MP_P1.25mm_Horizontal | J6 |
| 1 | Conn_01x03_MountingPin | Connector_JST:JST_SH_SM03B-SRSS-TB_1x03-1MP_P1.00mm_Horizontal | J4 |
| 1 | Conn_01x04_Shielded | Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal | J1 |
| 1 | DNP | Capacitor_SMD:C_0603_1608Metric | C23 |
| 1 | GL3224-QFN32 | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.1x3.1mm | U3 |
| 1 | HD3SS3220IRNHR | footprints:HD3SS3220IRNHR | IC1 |
| 1 | LP5912-1.8DRV | Package_SON:WSON-6-1EP_2x2mm_P0.65mm_EP1x1.6mm_ThermalVias | U6 |
| 1 | MCP2221AxML | Package_DFN_QFN:QFN-16-1EP_4x4mm_P0.65mm_EP2.5x2.5mm | U2 |
| 1 | Micro_SD_Card | Connector_Card:microSD_HC_Hirose_DM3D-SF | J3 |
| 1 | Micro_SD_Card | m1cha:usdex-male-open_bottom | J2 |
| 1 | USB_C_Receptacle | Connector_USB:USB_C_Receptacle_Amphenol_12401610E4-2A | J5 |
Questions
How big is the MicroSD Switch Reader PCB?
It measures 42.3 × 60.2 mm and has 4 copper layers, 0.8 mm thick.
What parts does the MicroSD Switch Reader use?
81 parts, built around the HD3SS3220IRNHR, LP5912-1.8DRV and BSS214NW-TP. 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 MicroSD Switch Reader KiCad files?
From the will127534/microSD-Switcher-Reader repository on GitHub, at the commit this page was made from: the board is microSD_Switch_Reader.kicad_pcb and its schematic microSD_Switch_Reader.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MicroSD Switch Reader 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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