Miniature resettable thermal cutoff devices protect lithium-polymer/prismatic cells from over temperature and over current

Bourns, Inc. introduced the company’s smallest miniature resettable Thermal Cutoff (TCO) devices designed for overtemperature and overcurrent protection of lithium polymer and prismatic cells. The Bourns Model CB Series is the company’s next generation of axial leaded TCO devices that control abnormal, excessive current virtually instantaneously, up to rated limits. This latest series is more than 26 percent smaller than Bourns’ successful NR Series, yet has the same current carrying capability. The devices’ low-profile 0.8 mm height and body width of 2.5 mm makes this series ideal for smaller batteries in smartphones and portable electronics, yet their high current carrying capability also makes them optimal for next-generation notebook and tablet PC battery cells.

Offering resistance levels as low as 2.2 milliohms, the Bourns® Model CB Series has current capabilities from 6 A up to 11 A at 60 °C as well as a welding projection option. These new miniature resettable TCO devices are available in four trip temperature options of 72 °C, 77 °C, 82 °C and 85 °C with a ±5 °C tolerance. The temperature options can be further narrowed upon request. In addition, the construction of the CB Series uses a high corrosion resistant bimetal mechanism to withstand most humid environments.

Available now, Bourns® Model CB devices are RoHS compliant* and halogen-free with UL agency recognition.