4 layers59.7 × 30.5 mm
2 layers22.9 × 63.5 mm
Stm32u0
cyao1234/s321Ultra low powered mcu devboard - 1+ year on a 500mAh lipo. With on board e-ink connector so you can get ultra long battery life with displays.
- Size
- 22.9 × 63.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 63
- Nets
- 70
- Pads
- 314
- Tracks, vias
- 689, 150
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 19 Jun 2026
- Updated
- 17 Aug 2026
Overview
Stm32u0 is an open-source printed circuit board by cyao1234, from the cyao1234/s32 repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 22.9 × 63.5 mm with 63 parts on 70 nets, routed with 689 tracks and 150 vias.
It is built around the HE9073A33M5R, SRV05-4 and TP4057, with the MBR0530, AO3401A and DSK24 among its other parts. Its parts include 25 capacitors, 9 resistors, 5 ICs, 5 diodes and 4 connectors. It belongs with the STM32 boards of this library.
Main components
7
HE9073A33M5R
SOT-23-5-40℃~+85℃ 1 100mV 3.3V 300nA 500mA 70dB@(1kHz) 7V Fixed Over Current Protection、Over Temperature Protection、Enable、Short Circuit Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHEERMICRVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
SRV05-4
SOT-23-6L-55℃~+150℃ 15V 1pF 4A 5V 5uA 6V 80W ESD Four channels IEC 61000-4-2、IEC 61000-4-5 Unidirectional SOT-23-6L ESD and Surge Protection (TVS/ESD) ROHShongjiachengESD And Surge Protection (TVS/ESD)TP4057
SOT-23-6-40℃~+85℃ 1 25uA 4.24V 4V~6.5V Charging IC Lithium Battery Not supported SOT-23-6 Battery Management ROHSTECH PUBLICBattery Management
MBR0530
SOD-1231 Independent 30V 5.5A 500mA 550mV@500mA 80uA@30V SOD-123 Schottky Diodes ROHSJiangsu Changjing Electronics Technology (CJ)Schottky Diodes
AO3401A
SOT-231 P-Channel 14nC@10V 30V 47mΩ@10V、60mΩ@4.5V、85mΩ@2.5V 4A 55pF 645pF 80pF 900mV SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
DSK24
SOD-123FLSchottky Diodeshongjiacheng
SI1308EDL
SC-70-3-55℃~+150℃ 1 N-channel 1.4nC@10V 1.5A 1.5V 105pF 11pF 132mΩ@10V 23pF 30V 400mW N-Channel SOT-323 MOSFETs ROHSVishay IntertechnologyMOSFETs
README
README.mdstm32u0
Ultra low powered mcu devboard - 1+ year on a 500mAh lipo. With on board e-ink connector so you can get ultra long battery life with displays.
It works with all types of 24-pin E-ink screens. Programmed via stm32 utilities.
Has on-board battery charger and battery connector. Battery is also broken out via a pin. It is in feather form so compatible with all addons
Features:
- On-board e-ink connector
- Battery charging and decharging
- stm32u0
- adafruit feather form
- Small form factor with mounting holes
The PCB and schematic is also open source, availiable for everyone to see and learn from.
| Item | Price | Where |
|---|---|---|
| PCB & PCBA | $100 | jlc |
Parts
63| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 1uF | Capacitor_SMD:C_0402_1005Metric | C5, C6, C20, C21, C22, C23, C24, C25, C26, C30, C31, C37 |
| 5 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3, C4, C7 |
| 5 | LOGO | LOGO | G***, G***, G***, G***, G*** |
| 4 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C27, C29, C32, C33 |
| 3 | 1.5k | Resistor_SMD:R_0402_1005Metric | R1, R2, R7 |
| 3 | MBR0530 | Diode_SMD:D_SOD-123 | D1, D2, D3 |
| 2 | 100k | Resistor_SMD:R_0402_1005Metric | R3, R4 |
| 2 | 10pF | Capacitor_SMD:C_0402_1005Metric | C8, C10 |
| 2 | 22uF | Capacitor_SMD:C_0603_1608Metric | C9, C11 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R5, R6 |
| 2 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_Pad_Via | H3, H4 |
| 2 | SW_Push | PCM_ckl-switch:SW_Push_SPST_TSA016 | SW1, SW2 |
| 1 | 1M | Resistor_SMD:R_0402_1005Metric | R13 |
| 1 | 2.2R | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | 32.768kHz | Crystal:Crystal_SMD_2012-2Pin_2.0x1.2mm | Y1 |
| 1 | 47uH 500mA | Inductor_SMD:L_APV_ANR3015 | L2 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | Conn_01x16 | Connector_PinHeader_2.54mm:PinHeader_1x16_P2.54mm_Vertical | J1 |
| 1 | Conn_01x20 | Connector_PinHeader_2.54mm:PinHeader_1x20_P2.54mm_Vertical | J3 |
| 1 | Conn_Eink_1.9"_Generic | stm32:HCTL_HC-FPC-05-09-24RLTAG-1MP_P0.5mm_Horizontal | U2 |
| 1 | DSK24 | Diode_SMD:D_SOD-123F | D5 |
| 1 | Ext_Bat | Jumper:SolderJumper-2_P1.3mm_Bridged_RoundedPad1.0x1.5mm | JP1 |
| 1 | Fuse | Fuse:Fuse_0805_2012Metric | F1 |
| 1 | HE9073A33M5R | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | LED | LED_SMD:LED_0402_1005Metric | D4 |
| 1 | LiPo | stm32:HCTL_JST_PH_HC-PH-2AWT-B_2P | J6 |
| 1 | SRV05-4 | Package_TO_SOT_SMD:SOT-23-6 | U3 |
| 1 | STM32U073CCUx | Package_DFN_QFN:QFN-48-1EP_7x7mm_P0.5mm_EP5.6x5.6mm_ThermalVias | U1 |
| 1 | Si1308EDL | Package_TO_SOT_SMD:SOT-323_SC-70 | Q1 |
| 1 | TP4057 | Package_TO_SOT_SMD:TSOT-23-6 | U4 |
| 1 | USB_C_Receptacle_USB2.0_14P | PCM_ckl-connector:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J2 |
Questions
How big is the Stm32u0 PCB?
It measures 22.9 × 63.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Stm32u0 use?
63 parts, built around the HE9073A33M5R, SRV05-4, TP4057 and MBR0530. 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 Stm32u0 KiCad files?
From the cyao1234/s32 repository on GitHub, at the commit this page was made from: the board is hardware/stm32u0.kicad_pcb and its schematic hardware/stm32u0.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Stm32u0 design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 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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