Micro SD Card Module

Specifications

• Product Type: Micro SD (TF) card interface module
• Application: Data storage interface for microcontrollers and embedded systems

Supported Cards

• Card Type: Micro SD / TF card
• Capacity Support:
  • Standard: up to 2 GB
  • Some versions support SDXC (depends on library and MCU)

Interface

• Communication: SPI interface
• Pin Configuration:
  • CS (Chip Select)
  • SCK (Serial Clock)
  • MOSI (Master Out Slave In)
  • MISO (Master In Slave Out)
  • VCC (Power)
  • GND (Ground)

Electrical Characteristics

• Operating Voltage: 3.3 V
• Logic Level: 3.3 V
• Onboard Regulator: Yes (allows 5 V input on VCC in many modules)
• Level Shifting: Available on most modules for 5 V compatibility

Performance

• SPI Clock Speed: typically up to 25 MHz (depends on MCU and wiring)
• Data Transfer Rate: depends on card class and system configuration

Mechanical Characteristics

• Card Slot: Push-push or push-pull type
• PCB Size: approximately 40 mm × 24 mm (varies by model)
• Mounting: Through-hole header pins

File System Support

• FAT16 and FAT32 (commonly supported via libraries)

Applications

• Data logging systems
• Industrial monitoring
• IoT data storage
• Embedded projects requiring file storage

Features

• Simple SPI interface for easy integration
• Onboard voltage regulator and level shifting (in most modules)
• Supports standard Micro SD cards
• Compact and low-cost storage solution

Important Notes

• SD card operates at 3.3 V; a direct 5 V connection without a regulator may damage the card
• Use proper SPI pins and stable wiring for reliable communication
• Ensure correct CS pin configuration in software
• Format the SD card to FAT32 for best compatibility
• Long wires may reduce communication reliability at higher speeds