Bourns Announces Industry’s First Surface Mount Miniature Resettable Thermal Cutoff (TCO) Devices for Battery Cell Protection

RIVERSIDE, Calif., ​April ​4, 2017 - Bourns, Inc., a leading manufacturer and supplier of electronic components, today announced the industry’s first surface mount Miniature Resettable Thermal Cutoff (TCO) devices. Bourns' new Model SA Series TCO battery protection solutions are compatible with surface mount reflow soldering methods, which eliminate supply chain steps and streamline the manufacturing process.

By controlling abnormal, excessive current virtually instantaneously up to rated limits, miniature TCO devices have become popular overcurrent and overtemperature protection solutions for lithium polymer and prismatic cell battery packs. TCO devices are traditionally welded in place in the manufacturing process. Bourns designed its new Model SA series so they could be soldered directly onto printed circuit boards saving manufacturing time and costs for battery cell suppliers.

The very low profile Model SA series has a maximum height of just 1.09 mm. They offer current capabilities from 6 A up to 11 A at 60 °C, are designed to withstand humid environments and offer high corrosion resistance from their bimetal mechanism. These features and their surface mount packaging make them ideal protection solutions for notebook PCs, tablet PCs and smart phones as well as open up new application areas such as USB Type C cables, automotive heating and power tools.

Pricing and Availability
Bourns’ new Model SA Series is available now, and a low current version is under development. These new TCO devices are also RoHS compliant* and UL recognized. As a pricing reference, the Model SA85SB0 is priced at $1.10 each for 7500 pieces.

For more information, please go to:

About Bourns

Bourns, Inc., is a leading manufacturer and supplier of position and speed sensors, circuit protection solutions, magnetic components, microelectronic modules, panel controls and resistive products. Headquartered in Riverside, California, USA, Bourns serves a broad range of markets, including automotive, industrial, consumer, communications, non-critical life support medical (low/medium risk), audio and various other market segments. Additional company and product information is available at

Bourns® and the Bourns logo are registered trademarks of Bourns, Inc. and may be used only with the permission of Bourns and proper acknowledgement. Other listed names and brands are trademarks or registered trademarks of their respective owners.

Bourns® products have not been designed for and are not intended for use in "lifesaving," "life-critical" or "life-sustaining" applications nor any other applications where failure or malfunction of the Bourns® product may result in personal injury or death. See Legal Disclaimer Notice

Agency Contact:
Annette Keller
Keller Communication
Company Contact:
David Scofield
Bourns, Inc.
(951) 781-5054
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