Description Stamp-S3A PIN1.27 Module is a highly integrated embedded module based on the Espressif ESP32-S3FN8. It combines a 240MHz Xtensa 32-bit LX7 dual-core processor, 8MB Flash, a programmable RGB LED, a user button, and an optimized 2.4GHz 3D antenna for compact wireless designs. Compared with larger integration styles, the pre-soldered 1.27mm-pitch SMT header gives the Stamp-S3A PIN1.27 Module a smaller footprint for high-density PCB layouts. It breaks out 23 GPIOs and supports rich interfaces including touch sensor, SPI, UART, I2C, I2S, GPIO, pulse counter, PWM, SDIO, and SD/MMC host control. For smart home devices, intelligent IoT nodes, industrial control terminals, and wearables, the Stamp-S3A PIN1.27 Module offers a compact Wi-Fi controller with development support for Arduino IDE, UiFlow2, ESP-IDF, and PlatformIO. Notes ESP32-S3 pins G0 and G46 are strapping pins that determine the boot mode. By default, G0 is pulled up and G46 is internally pulled down so the chip can boot from SPI Flash. Do not pull G46 high before boot, or the chip may fail to start. An SPI interface for a TFT display is reserved on the back of the module. Compatible FPC connector specifications are 8 pin and 12 pin. Features Stamp-S3A PIN1.27 Module core: ESP32-S3FN8 with 240MHz dual-core Xtensa LX7 processor and 8MB Flash. 1.27mm SMT integration: pre-soldered fine-pitch header for compact, high-density PCB designs. Rich I/O: 23 multifunctional GPIOs with support for common embedded interfaces. Wireless design: optimized 2.4GHz 3D antenna for stronger Wi-Fi performance. Built-in interaction: programmable RGB LED and physical user button. Flexible development: supports UiFlow2, Arduino IDE, ESP-IDF, and PlatformIO workflows. Specifications SoC ESP32-S3FN8, Xtensa LX7 dual-core, up to 240MHz Flash 8MB DC-DC MUN3CAD01-SC Wireless 2.4GHz Wi-Fi Input voltage DC 5V HMI 1 x programmable physical button, 1 x programmable RGB LED WS2812B-2020 Antenna type 2.4GHz 3D antenna Module resource interfaces Touch Sensor, SD/SDIO/MMC Host Ctrl, SPI, SDIO/SPI Slave Ctrl, EMAC, Motor PWM, LED PWM, UART, I2C, I2S, GPIO, Pulse Counter IO interfaces 23 GPIOs: G0-G15, G39-G44, G46 IO pitch 1.27mm LCD FPC pitch 0.5mm at 12P or 8P Operating temperature 0 to 40 deg C Module size 26.0 x 18.0 x 4.7mm Module weight 3.1g Package size 74.0 x 48.0 x 13.0mm Gross weight 7.6g Applications Stamp-S3A PIN1.27 Module controller for smart home products and compact IoT nodes. Industrial control terminals that need Wi-Fi, GPIO, and high-density PCB integration. Wearable devices and mini embedded products with limited internal space. Prototype-to-product modules for Arduino IDE, UiFlow2, ESP-IDF, or PlatformIO development. Product List 1 x Stamp-S3A PIN1.27 1 x Pin Sticker Other Content To enter download mode, hold the G0 button on the Stamp-S3A PIN1.27 Module before powering on, then release it after power is applied. The schematic, model size PDF, KiCad footprint, and 3D structure file help confirm boot pins, GPIO routing, FPC clearance, and mechanical fit before custom PCB production. For high-density carrier boards, the Stamp-S3A PIN1.27 Module keeps the controller compact while preserving Wi-Fi, 23 GPIOs, RGB LED, user button, and display-expansion options. Resources Stamp-S3A PIN1.27 product document Stamp-S3A PIN1.27 Arduino IDE quick start Stamp-S3A PIN1.27 UiFlow2 quick start Stamp-S3A PIN1.27 schematic PDF Stamp-S3A PIN1.27 model size PDF Stamp-S3A PIN1.27 KiCad footprint library Stamp-S3 KiCad 3D structure file ESP32-S3 datasheet PDF MUN3CAD01-SC DC-DC datasheet PDF Stamp-S3A PIN1.27 documentation PDF FAQ What processor does it use? It uses the ESP32-S3FN8 with a dual-core Xtensa LX7 processor running up to 240MHz. What is different about the 1.27mm version? The Stamp-S3A PIN1.27 Module uses a pre-soldered 1.27mm-pitch SMT header for smaller, denser PCB integration. How many GPIOs are available? The module exposes 23 GPIOs for embedded integration. Which development platforms are supported? It supports Arduino IDE, UiFlow2, ESP-IDF, and PlatformIO workflows. What boot-pin caution should be noted? Do not pull G46 high before boot, because G0 and G46 are strapping pins that determine boot mode.
