Adafruit
Adafruit Micro SD SPI or SDIO Card Breakout Board - 3V ONLY!
The Adafruit Micro SD SPI or SDIO Card Breakout Board gives you fast microSD card access using either standard SPI or the higher-speed SDIO protocol. Unlike ...
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The Adafruit Micro SD SPI or SDIO Card Breakout Board gives you fast microSD card access using either standard SPI or the higher-speed SDIO protocol. Unlike SPI-only breakouts, this board exposes the full SDIO bus with up to 4 data pins for significantly faster read/write speeds — roughly double the throughput compared to SPI on supported microcontrollers.
SDIO is ideal for projects that need to stream large files quickly, such as audio playback, video display, or high-frequency data logging. You can still use this board in SPI mode for simpler setups. Note that this board operates at 3.3V only — there are no level shifters or voltage regulators on board.
Key Features
- SPI + SDIO Support – Use standard SPI or faster multi-pin SDIO protocol
- Up to 4 Data Pins – SDIO mode provides significantly faster throughput than single-pin SPI
- MicroSD Card Slot – Standard push-push socket for microSD cards
- 3.3V Operation – Direct connection to 3.3V microcontrollers
- Breadboard Friendly – Includes header for easy prototyping
- Compact Breakout – Minimal footprint for embedding in projects
Ideal For
- High-speed data logging requiring fast write speeds
- Audio and video file streaming from microSD
- Projects that have outgrown SPI-only SD card speeds
- CircuitPython and Arduino projects on SDIO-capable microcontrollers
Package Contents
- 1× Adafruit Micro SD SPI/SDIO Breakout Board
- 1× Header pin strip
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- microSD card
- A microSD card is a small removable flash memory card used to store data such as audio, images, logs or program files. Its capacity and formatting (often FAT32 or exFAT) affect how much can be stored and whether the card needs preparing before use.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
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adafruit micro sd breakout board card tutorial
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