128MB Micro SD Card

128MB Micro SD Card provides a reliable and cost-effective flash memory solution for legacy devices and low-capacity embedded storage requirements. This professional-grade storage module utilizes high-quality NAND flash memory to ensure data integrity and stable performance in industrial or hobbyist environments. Consequently, it serves as the perfect boot medium or data logging tool for microcontrollers that cannot handle the high-addressing overhead of modern SDXC cards. Furthermore, its full compatibility with SPI and SD bus protocols allows for seamless integration into a wide variety of hardware platforms. Therefore, you can trust this 128MB Micro SD card to store critical firmware, configuration files, or sensor logs without the compatibility issues often found in larger capacity cards.

Key Features:

• High Compatibility: Supports both SD and SPI bus modes, making it compatible with almost any microcontroller or legacy mobile device.
• Optimized Capacity: The 128MB storage size is ideal for small file systems, preventing long mounting times and excessive directory indexing.
• Standard Voltage Support: Operates efficiently on standard 3.3 V logic levels, which most modern embedded systems and Arduino shields provide.
• Robust Data Retention: Built-in error correction code (ECC) identifies and corrects transfer errors, consequently extending the life of your stored data.
• Removable Storage: Offers a compact, hot-swappable form factor that allows for easy data transfer between the field device and a workstation.

Technical Specifications:

• Storage Capacity: 128 MB
• Standard: Secure Digital (SD) Specification Version 1.1 / 2.0
• Operating Voltage: 2.7 V to 3.6 V (Typical 3.3 V)
• Data Transfer Rate: Up to 10 MB/s (Class 4 / 6 performance levels)
• Interface Modes: SD Mode (1-bit/4-bit) and SPI Mode
• Endurance: ≥ 100,000 Program/Erase cycles
• Operating Temperature: −25°C to +85°C

Mechanical Specifications:

• Form Factor: MicroSD / TF (TransFlash)
• Housing Material: High-impact molded plastic
• Contact Plating: Gold-plated pins for superior conductivity and corrosion resistance.
• Durability: Resistant to static electricity and X-rays.

Dimensions:

• Length: 15.0 mm (±0.1 mm)
• Width: 11.0 mm (±0.1 mm)
• Thickness: 1.0 mm (±0.1 mm)
• Weight: ≈ 0.25 g

Pinout and Wiring:

• Pin 1 (DAT2): Data Line 2 (Not used in SPI mode).
• Pin 2 (CD/DAT3/CS): Chip Select in SPI mode; Data Line 3 in SD mode.
• Pin 3 (CMD/DI): Command signal in SD mode; Data Input in SPI mode.
• Pin 4 (VDD): Connect to 3.3 V Power Supply.
• Pin 5 (CLK): System Clock input.
• Pin 6 (VSS): Connect to Ground (0 V).
• Pin 7 (DAT0/DO): Data Line 0 in SD mode; Data Output in SPI mode.
• Pin 8 (DAT1): Data Line 1 (Not used in SPI mode).

Datasheet Reference:

• Download SD Card Physical Layer Simplified Specification

Commonly Used in:

• Development Boards: Arduino, ESP8266, ESP32, and STM32 boards using SD card shields or modules.
• Legacy Devices: Older digital cameras, GPS handhelds, and MP3 players that do not support SDHC/SDXC high-capacity cards.
• Industrial Equipment: CNC machines and PLC controllers that require small, dedicated boot partitions.

Applications:

• Data Logging: Recording sensor data, temperature logs, or GPS coordinates over long periods.
• Firmware Storage: Storing backup firmware images or system configuration files for easy field updates.
• WAV/Audio Playback: Serving as the storage source for small audio files in talking alarms or interactive exhibits.

Equivalent Models:

• Transcend 128MB Industrial MicroSD: A similar capacity card focused on heavy write endurance.
• Kingston 128MB MicroSD: Standard retail equivalent often found in older electronics kits.
• SanDisk 128MB TF Card: The original TransFlash equivalent with identical pinout and dimensions.

Package Includes:

• 1 x 128MB Micro SD Card