What Is The Compatibility Of Push-wire Terminal Blocks With Sd Cards?

The compatibility between push wire terminal block and SD card mainly depends on three key factors: physical size, interface standard and electrical characteristics. The mainstream push in terminal block wire connector on the market is divided into three specifications: standard SD, miniSD and microSD, corresponding to SD cards of different sizes. The standard push in wire terminal block is backward compatible with miniSD cards (adapter required), but does not support direct insertion of microSD cards; micro push fit terminal block connector has the smallest physical size and can only adapt to microSD cards.
In terms of interface standards, push connector block needs to match the speed level and bus mode of the SD card. The traditional push wire terminal block supports SPI and 1-bit SD mode, while the high-speed SDHC/SDXC card holder must support 4-bit SD bus mode, and the UHS-I/UHS-II card holder must also have additional data line pins. If the card holder does not support the corresponding protocol, it may cause slowdown or unrecognition. The latest SD Express card holder uses PCIe/NVMe interface, which is physically and electrically isolated from the traditional SD card, and the two are incompatible with each other.

Electrical compatibility involves the operating voltage range. The early push in terminal block wire connector uses a 3.3V logic level, while some UHS-II card holders support a 1.8V low voltage mode. The detection switch inside the card holder needs to accurately identify the card insertion status. Its mechanical life is usually 10,000 plug-in and pull-out cycles, which may cause poor contact. In addition, the waterproof push in wire terminal block uses a sealed design and may not be compatible with some thickened industrial SD cards. To ensure optimal compatibility, it is recommended to choose a full-size card holder that complies with the SD Association specification, and pay attention to check the card types and maximum capacity limits supported by the product label.