Adafruit microSD card breakout board
microSD breakout with level shifting for 3.3V and 5V systems, communicating over SPI. Includes a 3.3V regulator so it can run from a 5V supply; onboard pull-up resistors are included.
Pinout
- VCC
Module supply; use 3.3 V unless the breakout explicitly accepts 5 V.
Type · PowerVoltage · 3.3V - GND
Ground reference.
Type · Ground - MISO
SPI data from card to MCU.
Type · SPI - MOSI
SPI data from MCU to card.
Type · SPI - SCK
SPI clock.
Type · SPI - CS
Chip select; use a dedicated GPIO.
Type · SPI
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VCC | Power | Module supply; use 3.3 V unless the breakout explicitly accepts 5 V. | 3.3V |
| GND | Ground | Ground reference. | |
| MISO | SPI | SPI data from card to MCU. | |
| MOSI | SPI | SPI data from MCU to card. | |
| SCK | SPI | SPI clock. | |
| CS | SPI | Chip select; use a dedicated GPIO. |
Pin details
6 connections- VCC
Module supply; use 3.3 V unless the breakout explicitly accepts 5 V.
PowerVoltage · 3.3V - GND
Ground reference.
Ground - MISO
SPI data from card to MCU.
SPI - MOSI
SPI data from MCU to card.
SPI - SCK
SPI clock.
SPI - CS
Chip select; use a dedicated GPIO.
SPI
Memory
38 other options24LC32/25LC256 EEPROM, I2C FRAM, 64Mbit PSRAM, and microSD breakouts up to 64GB — matched to write frequency and data volume, not just interface.
256MB Micro SD Memory Card visual preview256MB Micro SD Memory Card
25LC256 256 Kbit SPI EEPROM visual preview25LC256 256 Kbit SPI EEPROM
64 Mbit Serial Pseudo SRAM - PSRAM - 3.3V 133 MHz visual preview64 Mbit Serial Pseudo SRAM - PSRAM - 3.3V 133 MHz
8GB Class 10 SD/MicroSD Memory Card - SD Adapter Included visual preview8GB Class 10 SD/MicroSD Memory Card - SD Adapter Included
Adafruit 24LC32 I2C EEPROM Breakout - 32Kbit / 4 KB - STEMMA QT visual previewAdafruit 24LC32 I2C EEPROM Breakout - 32Kbit / 4 KB - STEMMA QT
Adafruit I2C Non-Volatile FRAM Breakout - 256Kbit / 32KByte visual previewAdafruit I2C Non-Volatile FRAM Breakout - 256Kbit / 32KByte
Arduino Wireless SD Shield visual previewArduino Wireless SD Shield
AT24CXX EEPROM Board visual previewAT24CXX EEPROM Board
DiMeCard 8 microSD Card Holder visual previewDiMeCard 8 microSD Card Holder
Fermion: MicroSD Card Module for Arduino (Breakout) visual previewFermion: MicroSD Card Module for Arduino (Breakout)
Fermion: Serial Data Logger V2.0 for Arduino visual previewFermion: Serial Data Logger V2.0 for Arduino
FM24CXX FRAM Board visual previewFM24CXX FRAM Board
Related groups
4 groups
10W Super Bright LED - Violet visual previewLED 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 · 180 parts
18-Channel 8-bit PWM LED Driver w/ I2C Interface visual previewBare 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
10-bit ADC (SPI) visual previewConverters
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 · 114 parts
1/4W Resistor Pack - 400 PCS visual previewPassives
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 · 58 parts