A Look at Secure Digital Card Specifications
Secure Digital card specifications are set by the Secure Digital Association. This is done to ensure that there is a shared standard used across all cards that carry the Secure Digital (SD) name. Secure Digital card specifications allow OEMs and engineers to know exactly what they are getting when they use an SD card in a device, regardless of who the supplier is. The exact specifications of the cards vary depending on the type of SD card. Here is a closer look at some of the standard Secure Digital card specifications for industrial grade SD cards.
Operating and Storage Temperatures
SD cards designed for industrial use have extended temperature ranges to accommodate the demands of industrial operating conditions. Industrial devices are often used in conditions in which temperature fluctuations or extreme temperatures are common. Industrial SD cards have an operating temperature range of -40 degrees C to 85 degrees C. The storage temperature range for industrial SD cards is -50 degrees C to 90 degrees C. Keep in mind that these temperature range specifications are strictly for industrial SD cards with SLC NAND flash, and not for commercial designs.
Shock and Vibration
Just as SD cards that are used in industrial applications are likely to be subject to extreme temperatures, they are also likely to encounter shock and vibration levels that go beyond normal conditions. For example, an SD card may be used in automation in a manufacturing facility in which vibration from the machinery is constant. Industrial SD card shock specifications are 10G, 11msec – Sawtooth Waveform. In terms of vibration, the specs are 7.7GRM, 20Hz – 1000Hz @ 0.04 G2/Hz, and 1000Hz – 2000Hz @ 0.01 G2/Hz.
With SLC industrial SD cards, you can expect sequential read speeds of up to 25MB/s and sequential write speeds of up to 22MB/s. These speeds are typical of SD cards with SLC flash technology, but commercial SD cards with MLC flash typically offer marginally slower speeds. However, speed can also vary depending on the capacity of the SD card.
If you are considering using SD cards in your application, contact Delkin. Our customer team is here to explain Secure Digital card specifications, from capacity to customization options. Reach out to us with your questions today.