Powerful Renesas RA4M1 Core: Features the same 32-bit Cortex-M4 processor used in the Arduino UNO R4 Minima. This board provides a seamless migration path for your projects with high performance (48MHz + FPU) in a fraction of the size. Fully compatible with Arduino IDE 5V Tolerant I/O Design: Unlike traditional 3.3V development boards, the XIAO RA4M1 allows direct connection to 5V sensors and peripherals without the need for level shifters, simplifying your circuit design and making it safer for beginners Powerful Security Features: Built-in hardware encryption, secure boot, key storage, and other functions to ensure application security. Rich Interfaces & Expansion: Despite its tiny size, it packs a punch with 19 GPIOs (including 8 expansion pads on the back), 14-bit ADC for high-precision sensing, 12-bit DAC, and CAN Bus support for industrial automotive projects Ultra-Compact & Power Efficient: Maintaining the classic thumb-sized XIAO form factor (21 x 17.8mm) with USB-C. Supports excellent power management (as low as 45μA in sleep mode) with onboard battery charge management, ideal for wearable and portable IoT devices

Unlock the Power of Arduino UNO R4 in a Thumb-Sized Package

Meet the Seeed Studio XIAO RA4M1 (Pre-Soldered Version)—the latest evolution in the classic XIAO series. By integrating the powerful Renesas RA4M1 chip (the exact same 32-bit Cortex-M4 processor found in the Arduino UNO R4 Minima), we've bridged the gap between high performance and compact size.

Why choose the XIAO RA4M1?

▪ No More Voltage Headaches (5V Tolerant): Unlike the 3.3V SAMD21, the RA4M1 features 5V tolerant I/O pins. This means you can finally say goodbye to logic level converters when connecting 5V sensors and peripherals—making your circuit design simpler and safer.

▪ Ready to Build (Pre-Soldered): This version comes pre-soldered with header pins. You can plug it directly into a breadboard or connect jumper wires right out of the box—no soldering iron required. Perfect for classrooms and rapid prototyping.

▪ Pro-Level Features: With a 14-bit ADC for high-precision sensing, built-in FPU for math processing, and a native CAN Bus interface, it handles complex industrial and automotive tasks that lesser boards can't touch.

Whether you are building a wearable device, a mini-robot, or need a robust controller for your CAN bus network, the XIAO RA4M1 offers the extensive Seeed Studio XIAO accessory ecosystem compatibility you love, with the modern power you need.