New Industry Products

Bourns Announces its Smallest Miniature Resettable Thermal Cutoff Devices

October 13, 2019 by Paul Shepard

Bourns announced the introduction of its new Model CB Series of miniature resettable thermal cutoff (TCO) devices. These are the smallest TCO devices Bourns has produced and they are the next generation of axial-leaded miniature resettable thermal cutoff devices.

The very low-profile height of 0.8mm and body width of 2.5mm makes this series suited for smaller batteries in smartphones and portable electronics, yet the high current carrying capability means these miniature devices will be suitable for next generation notebook PC and tablet battery cells.

The new Model CB Series follows the successful Model NR Series and is about 26.5% smaller than the NR Series and 64.8% smaller than the HC Series, yet it does not compromise current carrying capability. With resistance levels as low as 2.2mΩ, the CB Series can carry the same level of current as its larger counterparts in the HC and NR Series.

The Bourns® Model CB Series is available in four trip temperature options of 72°C, 77°C, 82°C and 85°C with a ±5°C tolerance. This can be further narrowed upon request. The Model CB Series has current capabilities from 6A up to 1A at 60°C and a welding projection option.

These devices have been designed to withstand humid environments and use a high corrosion resistant bimetal mechanism. The Bourns® Model CB devices are RoHS compliant with UL agency recognition.

Summary of Features

  • Miniature Thermal Cutoff (TCO) device
  • Smallest body size in product family
  • Overtemperature and overcurrent protection for lithium polymer and prismatic cells
  • Controls abnormal, excessive current virtually instantaneously, up to rated limits
  • Wide range of temperature options
  • High corrosion resistance withstand