---
product_id: 442638315
title: "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."
brand: "seeed studio"
price: "Bs.250"
currency: BOB
in_stock: true
url: https://www.desertcart.bo/products/442638315-xiao-samd21-pre-soldered-the-smallest-arduino-microcontroller-based-on
store_origin: BO
region: Bolivia
---

# 48MHz CPU 20mm x 17.5mm USB Type-C 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.

**Brand:** seeed studio
**Price:** Bs.250
**Availability:** ✅ In Stock

## Summary

> 🌟 Small Size, Big Impact!

## Quick Answers

- **What is this?** 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. by seeed studio
- **How much does it cost?** Bs.250 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/products/442638315-xiao-samd21-pre-soldered-the-smallest-arduino-microcontroller-based-on)

## 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

- • **🔋 Energy Efficient:** Designed for low power consumption, perfect for tiny, wearable devices.
- • **🌍 Compact Powerhouse:** At just 20mm x 17.5mm, it's the smallest Arduino-compatible board, perfect for any project.
- • **🔗 Seamless Integration:** Fully compatible with Arduino IDE, making project development a breeze.
- • **💡 Versatile Applications:** Ideal for wearable tech, rapid prototyping, and DIY projects.
- • **🚀 Unleash Your Creativity:** Experience lightning-fast processing with a 48MHz ARM Cortex-M0+ microcontroller.

## Overview

The Seeed Studio XIAO SAMD21 is a compact yet powerful Arduino microcontroller featuring a 48MHz ARM Cortex-M0+ processor, 256KB flash memory, and 32KB SRAM. With 14 GPIO pins and a USB Type-C interface, it's designed for a variety of applications, including wearable devices and rapid prototyping, all while being fully compatible with the Arduino IDE.

## Description

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.

## 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 |
|---------------|-------|
| Processor | 48 MHz MediaTek_MT8125 |
| RAM | SRAM |
| Wireless Type | 802.11b |
| Brand | seeed studio |
| Series | XIAO SAMD21 |
| Operating System | Arduino |
| Item Weight | 0.176 ounces |
| Product Dimensions | 0.79 x 0.69 x 0.69 inches |
| Item Dimensions  LxWxH | 0.79 x 0.69 x 0.69 inches |
| Processor Brand | Microchip Technology |
| Number of Processors | 1 |
| Manufacturer | seeed studio |
| ASIN | B0B15B869W |
| Country of Origin | China |
| Date First Available | May 12, 2022 |

## Product Details

- **Brand:** seeed studio
- **Model Name:** XIAO SAMD21
- **Ram Memory Installed Size:** 32 GB
- **Memory Storage Capacity:** 256 KB
- **CPU Model:** MediaTek MT8125

## Images

![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. - Image 1](https://m.media-amazon.com/images/I/61K3hPTvfGL.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

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-02-24*