Adafruit ESP32-S3 Feather (8MB Flash, No PSRAM)

Overview

The Adafruit ESP32-S3 Feather (8 MB Flash, No PSRAM) brings Espressif's dual-core 240 MHz ESP32-S3 into the Feather form factor with 8 MB of Flash and 512 KB of on-chip SRAM — without the additional PSRAM found in sibling variants. This makes it the right choice for projects that don't need large buffer space but benefit from the ESP32-S3's dual cores and BLE support over the single-core ESP32-S2.

Native USB-C enables keyboard, mouse, MIDI, and mass-storage emulation directly from the SoC. The UF2 bootloader allows drag-and-drop firmware updates without a separate programming tool. A STEMMA QT connector with switchable power provides solderless I2C sensor connectivity, and the standard Feather pinout ensures compatibility with the FeatherWing ecosystem.

The board includes a MAX17048 battery fuel gauge, a LiPoly charger accessible from USB-C, and an NeoPixel with its own power-control GPIO. Reset and DFU buttons, On/Charge/User indicator LEDs, and a serial debug pin round out the hardware. Deep sleep current is approximately 100 µA.

Both CircuitPython and Arduino are supported, with Adafruit's CircuitPython library bundle providing ready-made drivers for the vast majority of STEMMA QT sensors. ESP-IDF developers can access the full ESP32-S3 peripheral set including the vector AI instructions for lightweight on-device inference.