Description M5Stack M5StampS3A with 2.54mm header pin is a compact embedded module based on Espressif ESP32-S3FN8. It integrates a 240MHz Xtensa 32-bit LX7 dual-core processor, 8MB Flash, 2.4GHz Wi-Fi, a programmable RGB LED, and a programmable physical button in a small Stamp form factor. The module breaks out 23 GPIO pins on 2.54mm pitch SMT headers, making it convenient for breadboard-style prototyping, DIP integration, flying-wire tests, and compact PCB designs. M5Stack M5StampS3A uses an optimized 2.4GHz 3D antenna for improved wireless reception. It also reserves a rear TFT screen SPI interface, supports multiple peripheral interfaces from ESP32-S3, and is suitable for developers who need a small Wi-Fi controller module for smart home nodes, IoT devices, industrial terminals, and wearable prototypes. Notes ESP32-S3 G0 and G46 are system boot mode control pins. G0 uses pull-up by default, and G46 uses internal pull-down by default, allowing the chip to start normally from SPI Flash. Do not pull G46 high before the chip starts; otherwise, the module may fail to boot. A TFT screen SPI interface is reserved on the back of the module, with compatible FPC connector specifications of 8PIN and 12PIN. Features ESP32-S3FN8 platform: the module provides a 240MHz dual-core processor with integrated 8MB Flash. 2.54mm header interface: soldered SMT headers make the module easier to prototype and integrate into carrier boards. 23 multifunction GPIO: exposes G0-G15, G39-G44, and G46 for flexible peripheral connection. Multiple interfaces: supports touch sensor, SPI, SDIO, EMAC, motor PWM, LED PWM, UART, I2C, I2S, GPIO, and pulse counter functions. Built-in interaction: includes one programmable physical button and one WS2812B-2020 programmable RGB LED. Optimized wireless design: the 2.4GHz 3D antenna helps maintain better signal reception than the previous Stamp-S3 design. Development workflows: supports UiFlow2, Arduino IDE, ESP-IDF, and PlatformIO. Specifications SoC ESP32-S3FN8 with Xtensa 32-bit LX7 dual-core processor, 240MHz clock frequency Flash 8MB DC-DC MUN3CAD01-SC Wi-Fi 2.4GHz Wi-Fi Input Voltage DC 5V Human Interaction Programmable physical button x 1, programmable RGB LED (WS2812B-2020) x 1 Antenna Type 2.4GHz 3D antenna Module Interfaces Touch sensor, SD/SDIO/MMC host controller, SPI, SDIO/SPI slave controller, EMAC, motor PWM, LED PWM, UART, I2C, I2S, GPIO, pulse counter IO Ports 23 ports: G0/G1/G2/G3/G4/G5/G6/G7/G8/G9/G10/G11/G12/G13/G14/G15/G39/G40/G41/G42/G43/G44/G46 IO Pitch 2.54mm LCD Pitch 0.5mm @ 12P or 8P Operating Temperature 0 ~ 40°C Product Size 26.0 x 18.0 x 4.7mm Product Weight 3.1g Package Size 74.0 x 48.0 x 13.0mm Gross Weight 7.6g Applications Smart home Wi-Fi nodes and compact controller boards Smart IoT devices that need a small ESP32-S3 module with exposed GPIO Industrial control terminals and space-limited embedded systems Smart wearable devices and compact interactive prototypes Arduino, UiFlow2, ESP-IDF, and PlatformIO development projects based on M5Stack M5StampS3A Product List 1 Stamp-S3A PIN2.54 1 Pin Sticker Other Content Download Mode To enter download mode, press and hold the G0 button before powering on, then release it after power-up. Product Comparison RGB LED Control Logic This version shares RGB LED power with the reserved screen FPC cable backlight; Stamp-S3 powers the RGB LED immediately when powered. Antenna Design This version uses an optimized antenna design for better signal reception. Module Boot Button The boot button has improved feel with a 4.0 x 3.0 x 2.0mm button specification. Power Consumption This version is optimized for lower power consumption compared with the standard Stamp-S3 design. Resources M5Stack M5StampS3A PIN2.54 product document M5Stack M5StampS3A PIN2.54 Arduino quick start M5Stack M5StampS3A PIN2.54 UiFlow2 quick start M5Stack M5StampS3A PIN2.54 schematic PDF M5Stack M5StampS3A PIN2.54 model size PDF M5Stack M5StampS3A PIN2.54 KiCad footprint M5Stack M5StampS3A KiCad 3D structure ESP32-S3 datasheet MUN3CAD01-SC DC-DC datasheet FAQ What is the main difference between this module and Stamp-S3 PIN2.54? M5Stack M5StampS3A uses an optimized antenna design, improved boot button, and lower-power design while keeping the 2.54mm header format. Can M5Stack M5StampS3A be used for breadboard-style prototyping? Yes. The 2.54mm pitch header format is convenient for DIP-style prototyping, carrier boards, and quick embedded tests. Which development tools are supported? It supports UiFlow2, Arduino IDE, ESP-IDF, and PlatformIO development workflows. Which pins need extra care during boot? G0 and G46 are ESP32-S3 boot mode control pins. Do not pull G46 high before startup, or the chip may fail to boot.
