XIAO ESP32-S3 Pre-Soldered Development Board 240MHz Dual-Core Wi-Fi Bluetooth 5 LE 8MB Flash 8MB PSRAM U.FL Antenna

XIAO ESP32-S3 Pre-Soldered Development Board

The XIAO ESP32-S3 is a compact wireless microcontroller development board powered by the ESP32-S3R8 SoC. It combines a 240MHz dual-core Xtensa LX7 processor, 2.4GHz Wi-Fi, Bluetooth 5 LE, 8MB Flash and 8MB PSRAM in a 21 × 17.8mm form factor. Pre-soldered headers make it suitable for rapid prototyping, IoT devices, smart-home equipment, robotics and wearable electronics.

Technical Specifications

• Product model: XIAO ESP32-S3, pre-soldered version
• Microcontroller: ESP32-S3R8 SoC
• Processor: 32-bit Xtensa LX7 dual-core processor
• Maximum clock frequency: 240MHz
• Flash memory: 8MB
• PSRAM: 8MB
• Wi-Fi: Complete 2.4GHz Wi-Fi subsystem
• Bluetooth: Bluetooth 5 Low Energy
• Mesh connectivity: Bluetooth Mesh
• GPIO: 11 PWM-capable pins
• Analog inputs: 9 ADC channels
• Communication interfaces: 1 × UART, 1 × I²C and 1 × SPI
• Antenna interface: U.FL connector
• Antenna: Compatible external 2.4GHz antenna included
• USB connector: USB Type-C
• Onboard indicators: User LED and battery-charging LED
• Onboard controls: RESET button and BOOT button
• USB Type-C input: 5V DC
• Battery input: 3.7V
• Battery management: Onboard lithium-battery charging
• Typical fast-charging current: Approximately 50mA
• Typical trickle-charging current: Approximately 3.8mA
• Typical circuit current through Type-C: Approximately 19mA at 5V
• Typical circuit current through battery: Approximately 22mA at 3.8V
• Typical modem-sleep current: Approximately 27mA at 3.8V
• Typical light-sleep current: Approximately 2mA at 3.8V
• Typical deep-sleep current: Approximately 14μA at 3.8V
• Typical Wi-Fi active current: Approximately 100mA
• Typical Bluetooth LE active current: Approximately 85mA
• Software compatibility: Arduino and MicroPython
• Working temperature: -20°C to 65°C
• Dimensions: 21 × 17.8mm
• Header configuration: Pre-soldered
• Component layout: Single-sided component mounting

Dual-Core ESP32-S3 Processing

The ESP32-S3R8 integrates a 32-bit Xtensa LX7 dual-core processor operating at up to 240MHz. Combined with 8MB Flash and 8MB PSRAM, it provides processing and memory resources for wireless communication, sensor acquisition, automation, robotics and graphical embedded applications.

Wi-Fi and Bluetooth 5 LE Connectivity

The integrated 2.4GHz Wi-Fi subsystem supports connection to wireless networks, cloud platforms and local gateways. Bluetooth 5 LE and Bluetooth Mesh enable energy-efficient communication with mobile devices, sensors and compatible smart-device networks.

U.FL External Antenna Interface

The onboard U.FL connector supports the included compatible external 2.4GHz antenna. Flexible antenna placement can improve wireless reception and accommodate different product enclosures. Communication distance depends on the antenna, transmit settings, installation environment and surrounding obstacles.

Low-Power Battery Operation

The board accepts 5V input through USB Type-C or power from a compatible 3.7V rechargeable lithium battery. Integrated charging management and deep-sleep current as low as approximately 14μA under specified test conditions support portable sensors, wearable electronics and intermittently active IoT nodes.

GPIO and Peripheral Expansion

Eleven PWM-capable GPIOs, nine ADC channels, UART, I²C and SPI interfaces support integration with sensors, displays, actuators and communication peripherals. Pre-soldered headers allow immediate connection to breadboards and compatible expansion hardware.

Compact Production-Friendly Design

The 21 × 17.8mm board uses a compact, single-sided component layout suitable for space-limited products. Its breadboard-compatible pin arrangement supports development, testing and integration into custom embedded hardware.

Typical Applications

• Internet of Things devices
• Wireless sensors and data loggers
• Smart-home controllers
• Robotics and automation equipment
• Wearable and health-monitoring prototypes
• Low-power network nodes
• Electronics and programming education
• Rapid embedded-system prototyping