6 layers160 × 136 mm
Serie
npgo22/Serie
The board itself is based around an STM32H723, the fastest microcontroller supported by Klipper at the moment.
549 parts
4 layers55.9 × 83.8 mm
Stm32g474board
halherta/stm32g474boardEmbLynx Development board for the stm32G474RE microcontroller
- Size
- 55.9 × 83.8 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 83
- Pads
- 283
- Tracks, vias
- 707, 220
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 12 Aug 2026
- Updated
- 12 Aug 2026
Overview
Stm32g474board is an open-source printed circuit board by halherta, from the halherta/stm32g474board repository on GitHub, published under the MIT licence. It is a 4-layer board of 55.9 × 83.8 mm with 70 parts on 83 nets, routed with 707 tracks and 220 vias.
It is built around the AP63205WU, AP7361C-33E and USBLC6-2SC6, with the PMEG3010BER, AO3401A and BAT54C among its other parts. Its parts include 24 capacitors, 12 resistors, 9 connectors, 6 diodes and 4 ICs. It belongs with the microcontroller boards boards and the STM32 boards of this library.
Main components
6
AP63205WU
TSOT-23-6-40℃~+85℃@(TA) 1 1.1MHz 22uA 2A 3.8V~32V 5V Buck Built-in Fixed Overcurrent Protection、Light load efficient mode、Cycle-by-cycle current limiting、Hiccup current limiting、EMI optimization (spread spectrum) Step-down type Yes TSOT-23-6 DC-DC Converters ROHSDiodes IncorporatedDC-DC Converters
AP7361C-33E
SOT-223-40℃~+85℃@(Ta) 1 1A 3.3V 340mV@(1A) 6V 75dB@(1kHz) 80uA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown、Enable control Positive SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSDiodes IncorporatedVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsUSBLC6-2SC6
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)
PMEG3010BER
SOD-123W1 Independent 1A 30V 450mV@1A 50A 50uA@30V SOD-123W Schottky Diodes ROHSNexperiaSchottky 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 SemiconductorMOSFETsBAT54C
SOT-231 Pair Common Cathode 200mA 2uA@25V 30V 600mA 800mV@100mA SOT-23 Schottky Diodes ROHSNexperiaSchottky Diodes
README
README.mdEmbLynx
An embedded systems development board based on the STM32G474RE microcontroller.
EmbLynx is a compact, feature-rich development board built around ST's STM32G474RE — a mixed-signal Cortex-M4 SoC with an unusually dense analog front end (5x ADC, 7x DAC, 6x OPAMP, 7x comparator) alongside DSP/math accelerators aimed at digital power conversion, motor control, and precision sensing. The board exposes that analog and digital peripheral set on standard 0.1" headers so it can be used as a general-purpose prototyping platform or stacked with daughterboards.
Full write-up: hussamtalkstech.com/emblynx
Features
- MCU: STM32G474RE (Arm Cortex-M4F, up to 170 MHz, 512 KB Flash, 128 KB SRAM)
- Power input:
- Reverse-polarity-protected DC jack or Vin pin (6–30 V), stepped down via an AP63205WU buck converter to 5 V
- Direct 5 V input via I/O header pins or USB-C (with TVS protection and 22 Ω series resistors)
- 3.3 V rail generated from the 5 V rail via an LDO
- Debug: STDC14 SWD/JTAG/serial port (STLink-V3 compatible)
- User I/O: RESET and BOOT0 buttons (USB DFU-friendly), user pushbutton (PC13), power LED, user LED (PD2)
- Analog support: Jumper-selectable Vref (+3V3 or external), filtering on VDD_A / VREF+
- Current measurement: IDD jumper (JP2) isolates the microcontroller's own 3.3 V rail (+3V3) from the peripheral/LED rail (+3V30) for clean current measurements
- RTC backup: BAT54C dual-Schottky arrangement feeds VBAT from either a coin-cell on the I/O header or +3V3 when no battery is present
- Form factor: 2.2" x 3.3", 4-layer PCB, 6x 8-pin 0.1" I/O headers (stacking-header compatible)
STM32G474RE peripheral highlights
| Category | Details |
|---|---|
| Core | Cortex-M4F w/ FPU + DSP, 170 MHz, ART Accelerator, 0-wait-state Flash |
| Memory | 512 KB dual-bank Flash (ECC), 128 KB SRAM (parity on select blocks), 32 KB CCM-SRAM |
| Math accelerators | CORDIC (trig/hyperbolic), FMAC (FIR/IIR/3p3z filters) |
| Timers | 17 total, incl. HRTIM (184 ps resolution), motor-control timers, watchdogs |
| Connectivity | 3x FDCAN, 4x I2C (Fast-mode+), 5x USART/UART, 1x LPUART, 4x SPI/2x I2S, SAI, USB 2.0 FS, USB-C/UCPD |
| ADC | 5x independent 12-bit SAR, up to 4 Msps each (8 Msps interleaved), up to 16-bit via oversampling |
| DAC | 7 channels (3 buffered external @ 1 Msps, 4 unbuffered internal @ 15 Msps) |
| OPAMP | 6x, externally accessible, configurable as PGAs (x2–x64), ~13 MHz bandwidth |
| Comparator | 7x, 16.7 ns propagation delay, programmable hysteresis |
| Reference | VREFBUF with 2.048 V / 2.5 V / 2.95 V presets |
| Other | 16-channel DMA, FSMC/Quad-SPI, hardware RNG, CRC, internal temp sensor |
Getting started
Prerequisites
- KiCad 7.x or later
Opening the project
- Clone this repository:
bash git clone https://github.com/halherta/stm32g474board.git - Open
stm32g474board.kicad_proin KiCad.
Schematic
A rendered PDF of the full schematic is included here.
Layout
Parts Library
my latest Kicad footprint / symbol parts library cab always be found here
Power architecture
| Rail | Source | Notes |
|---|---|---|
| VIN (6–30 V) | DC jack or I/O header | Reverse-polarity protected |
| +5V | VIN → AP63205WU buck, or direct 5 V pin, or USB-C | USB-C input has TVS + 22 Ω series protection |
| +3V30 | +5V → LDO | Powers LEDs, pull-ups, always-on peripherals |
| +3V3 | +3V30 → IDD jumper (JP2) | Powers the MCU only; JP2 allows current measurement of the MCU in isolation |
| VBAT | Coin cell (I/O header) or +3V3 | Selected via BAT54C dual-Schottky diodes |
Credits
Designed by Hussam — hussamtalkstech.com
Parts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 0.1u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4, C5, C6, C7, C8, C13, C20, C21, C22, C24 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10, R11, R12 |
| 3 | 1u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C9, C10 |
| 3 | SW_Push | Button_Switch_SMD:SW_SPST_PTS645Sx43SMTR92 | SW1, SW2, SW3 |
| 2 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C12 |
| 2 | 22 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4 |
| 2 | 22u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C14, C15 |
| 2 | 27p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C16, C17 |
| 2 | 330 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R8, R9 |
| 2 | 5.1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 2 | 7p | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C18, C19 |
| 2 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3, D5 |
| 2 | PMEG3010BER | Diode_SMD:Nexperia_CFP3_SOD-123W | D4, D6 |
| 1 | 100 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 1 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R7 |
| 1 | 100u | Capacitor_SMD:CP_Elec_6.3x7.7 | C23 |
| 1 | 10n | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C11 |
| 1 | 32K | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | Y2 |
| 1 | 4.7u | Inductor_SMD:L_Coilcraft_XxL4040 | L1 |
| 1 | 4.7u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3 |
| 1 | 47 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
| 1 | 600@100MHz | Inductor_SMD:L_0603_1608Metric | FB1 |
| 1 | 8MHz | Crystal:Crystal_SMD_5032-2Pin_5.0x3.2mm | Y1 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | AP63205WU | Package_TO_SOT_SMD:TSOT-23-6_HandSoldering | U4 |
| 1 | AP7361C-33E | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U5 |
| 1 | BAT54C | Package_TO_SOT_SMD:SOT-23 | D1 |
| 1 | Barrel_Jack | myparts:CUI_PJ-037AH | J6 |
| 1 | Conn_ST_STDC14 | Connector_PinHeader_1.27mm:PinHeader_2x07_P1.27mm_Vertical_SMD | J2 |
| 1 | IDD | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | Left_bot | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J5 |
| 1 | Left_mid | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J4 |
| 1 | Left_top | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J3 |
| 1 | MMSZ52XXB | Diode_SMD:D_SOD-123 | D2 |
| 1 | Right_bot | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J9 |
| 1 | Right_mid | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J8 |
| 1 | Right_top | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J7 |
| 1 | STM32G474RETx | 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_GCT_USB4110 | J1 |
| 1 | VREF_SEL | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP1 |
The 69 most common of 70 parts.
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Questions
How big is the Stm32g474board PCB?
It measures 55.9 × 83.8 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Stm32g474board use?
70 parts, built around the AP63205WU, AP7361C-33E, USBLC6-2SC6 and PMEG3010BER. 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 Stm32g474board KiCad files?
From the halherta/stm32g474board repository on GitHub, at the commit this page was made from: the board is stm32g474board.kicad_pcb and its schematic stm32g474board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Stm32g474board 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).