--- product_id: 442638319 title: "Seeed Studio XIAO SAMD21: The Smallest Arduino Microcontroller, 100% Arduino IDE Compatible, Pre-Soldered, USB Type-C, Battery Included" brand: "seeed studio" price: "125.36 DT" currency: TND in_stock: true category: "Seeed Studio" url: https://www.desertcart.tn/products/442638319-seeed-studio-xiao-samd21-the-smallest-arduino-microcontroller-100-arduino store_origin: TN region: Tunisia --- # 48MHz ARM Cortex-M0+ CPU Tiny 20x17.5mm footprint USB Type-C power & programming Seeed Studio XIAO SAMD21: The Smallest Arduino Microcontroller, 100% Arduino IDE Compatible, Pre-Soldered, USB Type-C, Battery Included **Brand:** seeed studio **Price:** 125.36 DT **Availability:** ✅ In Stock ## Summary > 🚀 Tiny Tech, Massive Impact — Power Your Next Big Idea! ## Quick Answers - **What is this?** Seeed Studio XIAO SAMD21: The Smallest Arduino Microcontroller, 100% Arduino IDE Compatible, Pre-Soldered, USB Type-C, Battery Included by seeed studio - **How much does it cost?** 125.36 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/442638319-seeed-studio-xiao-samd21-the-smallest-arduino-microcontroller-100-arduino) ## Best For - seeed studio enthusiasts ## Why This Product - Trusted seeed studio brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact Powerhouse:** Smallest Arduino-compatible board (20x17.5mm) that fits anywhere — from wearables to rapid prototypes. - • **Versatile I/O Arsenal:** 14 GPIO pins supporting analog, digital, PWM, DAC, I2C, UART & SPI for limitless project possibilities. - • **Wearable-Ready Design:** Battery pads and low power consumption make it perfect for next-gen wearable tech and tiny IoT devices. - • **Plug & Play USB Type-C:** Modern USB-C interface for hassle-free power delivery and ultra-fast code uploads. - • **Blazing Fast Microcontroller:** 3x speed of Arduino Uno/Nano with 48MHz ARM Cortex-M0+ CPU for seamless multitasking. ## Overview The Seeed Studio XIAO SAMD21 is the smallest Arduino-compatible microcontroller board, featuring a 48MHz ARM Cortex-M0+ CPU, 256KB flash memory, and 32KB SRAM. Its ultra-compact 20x17.5mm size packs 14 multifunctional GPIO pins, USB Type-C connectivity, and battery support, making it ideal for wearable devices, rapid prototyping, and compact DIY electronics projects. Fully compatible with Arduino IDE, it offers a powerful yet energy-efficient platform for professional makers and innovators. ## Description Take a look at Seeeduino XIAO(Pre-Soldered). What a small size and cute looking! It is the smallest member of the Seeeduino family. Seeeduino XIAO(Pre-Soldered) still carries the powerful CPU-ARM Cortex-M0+(SAMD21G18) which is a low-power Arduino microcontroller. On the other hand, this little board has good performance in processing but needs less power. As a matter of fact, it is designed in a tiny size and can be used for Arduino wearable devices and small projects.Apart from the strong CPU, Seeeduino XIAO(Pre-Soldered) is excellent in many other functions. It has 14 GPIO PINs, which can be used for 11 analog PINs, 11 digital PINs, 1 I2C interface, 1 UART interface, and 1 SPI interface. Some PINs have various functions, A1/D1 to A10/D10 Pins have PWM functions and Pin A0/D0 has a function of DAC which means you can get true analog signals not PWM signals when you define it as an analog pin, that’s why 14 GPIO PINs can realize more I/O PINs and interfaces. Moreover, Seeeduino XIAO(Pre-Soldered) supports the USB Type-C interface which can supply power and download code. There are power pads at the back of the XIAO which support battery and make it designed for wearable devices to become realistic. Except for the power LED, we add a user LED on board for your better coding experience. Usually a Dev. Board as small as this size will use the chip’s inner crystal oscillator for time fixing, in order to make the clock more accurate, Seeeduino XIAO(Pre-Soldered) layouts an extra 32.768KHz to make the clock more stable. ## Features - 🌱【Powerful CPU】 The XIAO is equipped with an ARM Cortex-M0+ 32bit 48MHz microcontroller, which is three times faster than Arduino Uno and Arduino Nano. Furthermore, this Arduino IDE compatible board Xiao has 256KB flash memory and 32KB SRAM. - 🌱【Rich Interfaces in a Tiny Size】 The device has 14 GPIO pins, each of which has 11 analog channels, 11 digital channels, I2C*1, UART*1, and SPI*1, USB Type-C interface*1 in a tiny space, just 20mm*17.5mm (about the size of your thumb). Seeeduino XIAO is the smallest Arduino compatible board in the Seeeduino series. - 🌱【Fully compatible with Arduino IDE】 Seeed Studio XIAO development board is perfectly compatible with Arduino IDE and you can easily create small projects using the extensive and comprehensive Arduino library. It has a 2.54mm pin pitch and can be used even when inserted into a breadboard because it is an Arduino microcontroller.It has a 2.54mm pin pitch and can be used even when inserted into a breadboard because it is an Arduino microcontroller. - 🌱【Applications】 Seeed Studio XIAO is suitable for Wearable devices, Rapid prototyping, DIY keyboard, USB to multi-channel TTL/USB host mode, etc. - 🌱【Perfect for Wearable and Tiny Arduino Projects】 This microcontroller has good performance in processing but needs less power. As a matter of fact, it is designed in a tiny size and can be used for Arduino wearable devices and small projects. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0B15B869W | | Best Sellers Rank | #62,809 in Computers ( See Top 100 in Computers ) #905 in Single-Board Computers | | Brand | Seeed Studio | | Built-In Media | / | | CPU Model | MediaTek MT8125 | | Compatible Devices | Arduino IDE compatible devices | | Connectivity Technology | USB | | Customer Reviews | 4.3 4.3 out of 5 stars (67) | | Item Dimensions L x W x H | 18W x 18H millimeters | | Manufacturer | seeed studio | | Memory Storage Capacity | 256 KB | | Model Name | XIAO SAMD21 | | Operating System | Arduino | | Processor Brand | ARM | | Processor Count | 1 | | Processor Speed | 48 MHz | | RAM Memory Installed | 32 GB | | RAM Memory Technology | SRAM | | Total Usb Ports | 1 | | Unit Count | 1.0 Count | | Wireless Compability | 802.11b | ## Product Details - **Brand:** Seeed Studio - **CPU model:** MediaTek MT8125 - **Installed RAM memory size:** 32 GB - **Memory storage capacity:** 256 KB - **Model name:** XIAO SAMD21 ## Images ![Seeed Studio XIAO SAMD21: The Smallest Arduino Microcontroller, 100% Arduino IDE Compatible, Pre-Soldered, USB Type-C, Battery Included - Image 1](https://m.media-amazon.com/images/I/61K3hPTvfGL.jpg) ![Seeed Studio XIAO SAMD21: The Smallest Arduino Microcontroller, 100% Arduino IDE Compatible, Pre-Soldered, USB Type-C, Battery Included - Image 2](https://m.media-amazon.com/images/I/61xvNg+KZgL.jpg) ![Seeed Studio XIAO SAMD21: The Smallest Arduino Microcontroller, 100% Arduino IDE Compatible, Pre-Soldered, USB Type-C, Battery Included - Image 3](https://m.media-amazon.com/images/I/61c+usZyg3L.jpg) ![Seeed Studio XIAO SAMD21: The Smallest Arduino Microcontroller, 100% Arduino IDE Compatible, Pre-Soldered, USB Type-C, Battery Included - Image 4](https://m.media-amazon.com/images/I/61G3BFXtwuL.jpg) ![Seeed Studio XIAO SAMD21: The Smallest Arduino Microcontroller, 100% Arduino IDE Compatible, Pre-Soldered, USB Type-C, Battery Included - Image 5](https://m.media-amazon.com/images/I/51iZsB9hwpL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Can i attach voltage in to the 5v pin? i'm trying to put this on a pcb. will it have the same voltage regulation?** A: As a previous contributor wrote: a lot of people answering questions here do not know what they are talking about! So here is the answer copied straight from the Seeed Studio webpage regarding this board: "Note For general I/O pins: Working voltage of MCU is 3.3V . Voltage input connected to general I/O pins may cause chip damage if it' higher than 3.3V . For power supply pins: The built-in DC-DC converter circuit able to change 5V voltage into 3.3V allows to power the device with a 5V supply via VIN-PIN and 5V-PIN. Please pay attention to use, do not lift the shield cover." **Q: Does this come with a bootloader or not?** A: yes - I'm pretty sure it does. Its been a while since I played with it. But I seem to recall all was needed was to download the necessary Arduino files into the Arduino programming system and make the correct connection to the device. However be aware the device is finicky in that it needs to be rebooted for programming mode using a jumper wire. So if you're doing a lot of development/debugging, do that work in a standard Arduino first, and then translate your debugged program to this device. **Q: Is the IO 5V tolerant?** A: From the testing I have done on mine, the pins when being used as an input, are 3.3v tolerant. **Q: The board can be connected to 5V power supply and simultaneously been conectes to the usb conector from my computer?** A: There would be a problem if the 5V supply was actually a lower voltage than the USB (which should be 5V). A diode protects everything if the external 5V supply was above 5V (up to the 6V limit of the voltage regulator on the board). To be safe, a diode should be added in series with the external 5V supply. This protection is present in genuine Arduino boards' VIN pin. ## Frequently Bought Together - Seeed Studio XIAO SAMD21 (Pre-Soldered) The Smallest Arduino Microcontroller Based on SAMD21 with Rich Interfaces, 100% Arduino IDE Compatible, desiged for Projects Need Arduino Micro, 1pc. - Seeed Studio XIAO ESP32C3 - Tiny MCU Board with Wi-Fi and BLE for IoT Controlling Scenarios. Microcontroller with Battery Charge, Power Efficient, and Rich Interface for Tiny Machine Learning. … - ELEGOO 120pcs Multicolored Dupont Wire 40pin Male to Female, 40pin Male to Male, 40pin Female to Female Breadboard Jumper Ribbon Cables Kit Compatible with Arduino Projects --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/442638319-seeed-studio-xiao-samd21-the-smallest-arduino-microcontroller-100-arduino](https://www.desertcart.tn/products/442638319-seeed-studio-xiao-samd21-the-smallest-arduino-microcontroller-100-arduino) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-22*