4 layers65 × 71.8 mm
4 layers51 × 33 mm
SmolExG
matthewlai/SmolExG1- Size
- 51 × 33 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 63
- Nets
- 51
- Pads
- 291
- Tracks, vias
- 515, 222
- Pours
- 6
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 7 Feb 2026
- Updated
- 9 Apr 2026
Overview
SmolExG is an open-source printed circuit board by matthewlai, from the matthewlai/SmolExG repository on GitHub. It is a 4-layer board of 51 × 33 mm with 63 parts on 51 nets, routed with 515 tracks and 222 vias.
It is built around the ESP32-C3-WROOM-02-H4, XC6210B332MR and TP4057, with the AO3400A, AO3401A and PJ-327C-4A among its other parts. Its parts include 25 capacitors, 20 resistors, 5 ICs, 3 connectors and 2 transistors. It belongs with the ESP32 and RISC-V boards of this library.
Main components
6
ESP32-C3-WROOM-02-H4
SMD,20x18mm-105dBm -40℃~+105℃ 2.4GHz 20.5dBm 345mA 3V~3.6V 82mA Bluetooth5.0 ESP32-C3 On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,20x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
XC6210B332MR
SOT-23-5-40℃~+85℃@(Ta) 1 25uA 3.3V 450mV@(800mA) 5.5V 70dB@(1kHz) 800mA Fixed Over Current Protection、Over Temperature Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
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
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETsAO3401A
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
PJ-327C-4A
SMD3.5mm Headphone Jack 30V 500mA Phosphor bronze Silver SMD Audio Connectors ROHSHRO ElectronicsAudio Connectors (Headphones)
Parts
63| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 1uF | Capacitor_SMD:C_0402_1005Metric | C4, C5, C7, C13, C14, C15, C16, C17, C18, C21, C22, C25 |
| 8 | 10kR | Resistor_SMD:R_0402_1005Metric | R1, R2, R11, R12, R13, R18, R19, R20 |
| 6 | 1MR | Resistor_SMD:R_0402_1005Metric | R3, R4, R5, R6, R15, R16 |
| 5 | 100nF | Capacitor_SMD:C_0402_1005Metric | C1, C6, C19, C23, C24 |
| 4 | 10uF | Capacitor_SMD:C_0402_1005Metric | C2, C11, C12, C20 |
| 3 | 4.7kR | Resistor_SMD:R_0402_1005Metric | R10, R14, R17 |
| 3 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_Pad_Via | H1, H2, H3 |
| 2 | 1nF | Capacitor_SMD:C_0402_1005Metric | C9, C10 |
| 2 | 5.1k | Resistor_SMD:R_0402_1005Metric | R7, R8 |
| 2 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_XKB_TS-1187A | SW1, SW2 |
| 2 | XC6210B332MR | Package_TO_SOT_SMD:SOT-23-5 | U2, U3 |
| 1 | 10nF/C0G | Capacitor_SMD:C_0402_1005Metric | C8 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R9 |
| 1 | 22uF | Capacitor_SMD:C_0805_2012Metric | C3 |
| 1 | ADS1298xPAG | Package_QFP:TQFP-64_10x10mm_P0.5mm | U1 |
| 1 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | AO3401A | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | Conn_01x02 | easyeda2kicad:CONN-SMD_B2B-PH-SM4-TB-LF-SN | J2 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | ESP32-C3-WROOM-02 | RF_Module:ESP32-C3-WROOM-02 | U5 |
| 1 | Jumper_2_Open | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | PJ-327C-4A | easyeda2kicad:AUDIO-SMD_PJ-327C-4A | Audio1 |
| 1 | Red | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | TP4057 | Package_TO_SOT_SMD:TSOT-23-6 | U4 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_HRO_TYPE-C-31-M-12 | J1 |
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Questions
How big is the SmolExG PCB?
It measures 51 × 33 mm and has 4 copper layers, 1.6 mm thick.
What parts does the SmolExG use?
63 parts, built around the ESP32-C3-WROOM-02-H4, XC6210B332MR, TP4057 and AO3400A. 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 SmolExG KiCad files?
From the matthewlai/SmolExG repository on GitHub, at the commit this page was made from: the board is SmolExG.kicad_pcb and its schematic SmolExG.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SmolExG design in my own project?
Its repository states no licence, so its author keeps all rights: ask matthewlai before reusing the design.