Murata adds high drain models to lthium coin cell range
Two high drain and extended temperature ranges have been added by Murata to its lithium coin cell batteries. The heat resistant CR battery sizes now include a high current type (suffix R). It has twice the maximum pulsed discharge rating of conventional models at 50mA (three seconds at 2.0V or higher, at 50 per cent nominal capacity at 23 degrees C. It also has three times the discharge time (45mA pulsed for three seconds at 23 degrees C). These characteristics make the batteries suitable for low power wide area (LPWA) communications devices, including LoRa and SigFox, both of which have high peak current requirements. Available in CR2032 and CR2450 sizes with 3.0V nominal rating, the cells have nominal capacities of 200 and 500 mAh respectively for discharge down to 2.0V.
The second range is extended temperature types (suffix X). These batteries are available in package sizes CR2032, CR2450, CR2477 and CR3677 and have an extended operating temperature range of -40 to +85 degrees C compared with standard types rated at -30 to +70 degrees C, says Murata. The wider temperature range is suitable for electronic parts in automotive environments; they are claimed to have a better cost-performance figure compared with types rated to 125 degrees C. Stored charge loss at high temperature is minimal over time, confirms Murata, and the CR3677X model delivers the highest capacity of any lithium coin cell, enabling smaller and thinner devices.
Unlike earlier lithium cells, which have been seen as back-up supplies, the CRxxxxR and CRxxxxX coin cell batteries can be used in the IoT, automotive and factory automation where LPWA networks are becoming common with sensors requiring local power supplies. The higher temperature range particularly suits outdoor applications such as smart meters, security and automotive, where the cells can replace conventional cylindrical types, adds Murata.
Samples are available now and mass production is scheduled to begin in January 2019 (CR3677X end of 2019).