Adafruit MicroSD Card Breakout - 3V Only
Overview
Small breakout board that exposes a microSD card socket for use with microcontrollers. The board supports using the card over SPI or SDIO and is intended for 3.3V logic and power only. Use this breakout to add removable storage to embedded projects without soldering a microSD socket directly to your PCB.
Why Choose This Part
Very small, simple breakout that exposes standard microSD signals so you can wire it directly to an MCU or breadboard. The explicit 3V-only designation avoids ambiguity about logic and power levels - connect only to 3.3V devices or use a level shifter. Supporting both SPI and SDIO lets you choose the interface that matches your MCU and software stack.
Applications
Getting Started
Wire the breakout to your MCU using MOSI/MISO/SCK and a chip select pin for SPI, or wire the SDIO pins if you need higher-speed access. In Arduino projects, use the built-in SD library or the SdFat library; for other toolchains use the platform's FAT or SD stacks. Important: do not apply 5V to the breakout - use only 3.3V power and logic or add proper level shifting.
