Micro SD SPI or SDIO Card Breakout Board - 3V ONLY!

MicroSD card breakout supporting SPI or SDIO, 3 V logic only. Level shift before pairing with a 5 V host. Used for image, audio, and sensor-log storage on microcontrollers.

3V
3.3 V power input for the microSD card breakout; Adafruit warns that 5 V or VBAT will damage the card.
Type · powerVoltage · 3.3V only
GND
Common ground for power and logic.
Type · groundVoltage · 0V
DET
Card-detect signal; connected to GND internally when no card is inserted and pulled up to 3V through 4.7 kΩ when a card is inserted.
Type · digitalVoltage · 3V logic
CLK / SCK
SPI clock input to the SD card.
Type · spiVoltage · 3V logic
SO / MISO
SPI serial data out from the SD card to the microcontroller.
Type · spiVoltage · 3V logic

Memory

38 other options

24LC32/25LC256 EEPROM, I2C FRAM, 64Mbit PSRAM, and microSD breakouts up to 64GB — matched to write frequency and data volume, not just interface.

View all 38

256MB Micro SD Memory Card visual preview

Related groups

4 groups

LED pixels

WS2812/SK6812 NeoPixel strips, rings and Jewels, APA102 DotStar pixels, and plain analog RGB strips — each matched to its protocol and host, not just its connector.

Components · Addressable LEDs · 176 parts

Bare ICs

74HC logic gates, MCP3008/MCP23017 ADCs and expanders, 24LC256 EEPROM, 4N25-series optocouplers and ULN2803A drivers — bare DIP chips with no breakout-board conveniences like pull-ups or level shifting.

Components · Integrated circuits · 68 parts

Converters

ADS1115/MCP3421 ADCs, MCP4725 and GP8413 DACs, CP2102 USB-UART boards, and I2C plumbing like the LTC4316 address shifter — matched to bus, resolution and signal range.

Components · Interface converters · 115 parts

Passives

E12 resistor kits, ceramic and electrolytic capacitor sets, 1N4148/1N4007 diodes, TIP120 Darlingtons, IRLZ44N MOSFETs and 100F supercapacitors — bench stock in kit quantities.

Components · Passives · 56 parts

Pin	Type	Function	Voltage
3V	power	3.3 V power input for the microSD card breakout; Adafruit warns that 5 V or VBAT will damage the card.	3.3V only
GND	ground	Common ground for power and logic.	0V
DET	digital	Card-detect signal; connected to GND internally when no card is inserted and pulled up to 3V through 4.7 kΩ when a card is inserted.	3V logic
CLK / SCK	spi	SPI clock input to the SD card.	3V logic
SO / MISO	spi	SPI serial data out from the SD card to the microcontroller.	3V logic
SI / MOSI	spi	SPI serial data input from the microcontroller to the SD card.	3V logic only
CS	spi	SPI chip-select input; pull low to start an SPI transaction.	3V logic only
CMD	sdio	SDIO bidirectional command/information signal between microcontroller and SD card.	3V logic
D0	sdio	SDIO bidirectional data line; Adafruit identifies the silkscreen legend as D0.	3V logic
D1	sdio	SDIO bidirectional data line; Adafruit identifies the silkscreen legend as D1.	3V logic
DAT2	sdio	SDIO bidirectional data line; Adafruit identifies the silkscreen legend as DAT2.	3V logic
D3	sdio	SDIO bidirectional data line; Adafruit identifies the silkscreen legend as D3.	3V logic

Pinout

LED pixels

Bare ICs

Converters

Passives