# Adafruit ESP32-S3 Feather (4MB Flash, 2MB PSRAM) > Feather-format ESP32-S3 board with 4 MB flash and 2 MB PSRAM, dual-core 240 MHz, native USB-C, BLE 5, WiFi, STEMMA QT, LiPoly charging, and MAX17048 battery monitor. ## Quick Facts - **Brand:** Adafruit - **Board Type:** dev-board - **Price:** ~$17.5 - **Product Readiness:** developer - **CPU:** Xtensa LX7 dual-core @ 240 MHz (ESP32-S3) - **CPU Architecture:** Xtensa LX7 - **CPU Cores:** 2 - **RAM:** 512 KB SRAM + 2 MB PSRAM - **PSRAM:** 2MB - **Flash:** 4MB - **Power:** 5V + LiPo - **Operating Voltage:** 3.3V - **Dimensions:** 52.3 × 22.7 × 7.2 mm - **Weight:** 6.3 g - **Battery:** user-supplied LiPo - **Antenna:** built-in PCB antenna ## Connectivity - **Wifi:** 2.4GHz 802.11 b/g/n - **Bluetooth:** BLE 5.0 ## Open Source - **Firmware:** Yes - **Schematics:** Yes - **PCB Layout:** Yes ## Compatible Firmware circuitpython, arduino, esp-idf ## Use Cases - iot - smart-home - wearable ## Components - **ESP32-S3** (mcu): Espressif ESP32-S3 dual-core 240 MHz Xtensa LX7 with 512 KB SRAM, 2 MB PSRAM, native USB OTG, WiFi, and BLE 5. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=adafruit-esp32-s3-feather-4mb-psram&source=md-export) - **MAX17048** (battery-charger): Maxim MAX17048 Li-Ion/LiPo fuel gauge providing state-of-charge via I2C. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.analog.com%2Fmedia%2Fen%2Ftechnical-documentation%2Fdata-sheets%2FMAX17048-MAX17049.pdf&ref=openhardware.directory&product=adafruit-esp32-s3-feather-4mb-psram&source=md-export) ## Protocols - **I2C**: SDA: GPIO3, SCL: GPIO4 - **SPI**: SCK: GPIO36, MOSI: GPIO35, MISO: GPIO37 - **UART**: TX: GPIO43, RX: GPIO44 - **USB**: ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | GPIO17 | ADC | ADC | ADC | | GPIO18 | ADC | ADC | ADC | | GPIO14 | ADC | ADC | ADC | | GPIO15 | ADC | ADC | ADC | | GPIO16 | ADC | ADC | ADC | | GPIO8 | ADC | ADC | ADC, touch | | GPIO5 | GPIO | GPIO | GPIO, PWM | | GPIO6 | GPIO | GPIO | GPIO, PWM | | GPIO9 | GPIO | GPIO | GPIO, PWM | | GPIO10 | GPIO | GPIO | GPIO, PWM | | GPIO11 | GPIO | GPIO | GPIO, PWM | | GPIO12 | GPIO | GPIO | GPIO, PWM | | GPIO13 | GPIO | GPIO | GPIO, PWM | | GPIO36 | SCK | SPI | SPI | | GPIO35 | MOSI | SPI | SPI | | GPIO37 | MISO | SPI | SPI | | GPIO3 | SDA | I2C | I2C, STEMMA QT | | GPIO4 | SCL | I2C | I2C, STEMMA QT | | GPIO43 | TX | UART | UART | | GPIO44 | RX | UART | UART | ## Available Software - **[CircuitPython](https://openhardware.directory/r?to=https%3A%2F%2Fcircuitpython.org%2Fboard%2Fadafruit_feather_esp32s3_4mbflash_2mbpsram%2F&ref=openhardware.directory&product=adafruit-esp32-s3-feather-4mb-psram&source=md-export)** - **[Arduino ESP32](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fespressif%2Farduino-esp32&ref=openhardware.directory&product=adafruit-esp32-s3-feather-4mb-psram&source=md-export)** ## Description ## Overview The Adafruit ESP32-S3 Feather with 4 MB Flash and 2 MB PSRAM is the PSRAM-equipped sibling of the 8 MB no-PSRAM variant, offering an additional 2 MB of pseudo-static RAM for applications that need larger buffers — useful for JPEG decoding, audio streaming, or running multiple CircuitPython display libraries simultaneously. Native USB-C via the ESP32-S3's hardware USB OTG allows the board to emulate keyboards, mice, MIDI devices, and mass-storage drives without a separate bridge chip. The UF2 bootloader makes firmware updates drag-and-drop simple. Both WiFi (2.4 GHz) and BLE 5 are supported simultaneously, and the standard Feather pinout ensures FeatherWing compatibility. A MAX17048 fuel-gauge IC monitors the LiPoly battery state-of-charge over I2C, and the onboard charger keeps the cell topped up from USB-C. A STEMMA QT connector with switchable power, a NeoPixel with power control, Reset and DFU buttons, and On/Charge/User indicator LEDs are all included. Deep sleep current is approximately 100 µA. This board is compatible with CircuitPython, Arduino (ESP32 core), and ESP-IDF. The 2 MB PSRAM makes it better suited than the no-PSRAM variant for projects using the ESP32-S3's camera interface, TensorFlow Lite Micro, or large in-memory datasets. ## Where to Buy - [Adafruit](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F5477&ref=openhardware.directory&product=adafruit-esp32-s3-feather-4mb-psram&source=md-export) — 17.5 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Fwww.adafruit.com%2Fproduct%2F5477&ref=openhardware.directory&product=adafruit-esp32-s3-feather-4mb-psram&source=md-export) - [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2Fadafruit%2FAdafruit-ESP32-S3-Feather-PCB&ref=openhardware.directory&product=adafruit-esp32-s3-feather-4mb-psram&source=md-export) - [learn guide](https://openhardware.directory/r?to=https%3A%2F%2Flearn.adafruit.com%2Fadafruit-esp32-s3-feather&ref=openhardware.directory&product=adafruit-esp32-s3-feather-4mb-psram&source=md-export) ## Tags `esp32-s3`, `feather`, `stemma-qt`, `circuitpython`, `native-usb`, `wifi`, `ble`, `lipo`, `psram` ## Images ![Adafruit ESP32-S3 Feather (4MB Flash, 2MB PSRAM)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-esp32-s3-feather-4mb-psram/9b48a6a6626d.jpg) ![Adafruit ESP32-S3 Feather (4MB Flash, 2MB PSRAM)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-esp32-s3-feather-4mb-psram/0e454d76f3be.jpg) ![Adafruit ESP32-S3 Feather (4MB Flash, 2MB PSRAM)](https://nbg1.your-objectstorage.com/openhardware-directory/entities/adafruit-esp32-s3-feather-4mb-psram/a14938a19c1b.jpg) > **Battery Powered:** Li-Po --- [View full device page](https://openhardware.directory/devices/adafruit-esp32-s3-feather-4mb-psram)