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Products by Category

Thermal Cutoff Devices (TCOs)

Offering an effective overtemperature protection solution, Bourns® TCO devices, also known as mini-breakers, have ingeniously enhanced existing technology in such a way to develop their protection capabilities.
TCO devices have been proven to protect batteries, cables and ICs from damage from overheating by acting independently of any controller.
Constructed with a bimetal disk and a ceramic PTC in parallel, the Bourns® TCO family delivers the best features of both. The bimetal disk reacts in a precise manner to changes in the ambient temperature.
Once triggered, it limits the current and diverts the current into the PTC.
The PTC generates heat to keep the bimetal open and provides a self-holding function.

Bourns® Model SD Series Mini-breakers
INTRODUCTION

With the introduction of the new Model SD Series Thermal Cutoff devices (TCOs), Bourns is pushing the boundaries of overtemperature protection compared to traditional devices that have come before it.
The SD series deliver several industry FIRSTs:

  • ・First TCO series that can be either surface mounted or welded.
  • ・First TCO series with trip temperature ranges from 55 ˚C up to 150 ˚C(Previous models only supported from 72 ˚C up to 85 ˚C or 90 ˚C)
  • ・First TCO series offering non-automatically resettable (self-hold function) or automatically resettable (non self-hold) function options
  • ・First TCO series tested to pass AEC-Q200 equivalent test standards
The advanced technology and features in these versatile series significantly broaden their use in a new and wider range of markets and applications.

APPLICATIONS
The versatility of the new Model SD Series TCOs means the devices can be used in traditional notebook and tablet PC, smartphone and wearable device applications.
In addition, the Bourns® Model SD series provide extended temperature operation support for a broad range of additional designs such as: heaters used in automotive applications (sensors, cameras, seating, steering), CCTC cameras and cosmetic and non-critical medical diagnostic equipment.

FEATURES

  • ・Resettable overtemperature and overcurrent protection
  • ・Can be used as a resettable overtemperature sensor
  • ・Trip temperature range of 55 ˚C up to 150 ˚C
  • ・High trip temperature accuracy of just ±5 ˚C
  • ・Highly repeatable with ratings of up to 10,000 cycles

  • ・Surface mount or weldable
  • ・Option for either non-automatically resettable(self-hold function) or automatically resettable (non self-hold function)
  • ・Very low resistance values of just 4 mΩ max.
  • ・Tested to AEC-Q200 equivalent test standards
  • ・RoHS compliant
Movie
  • Bourns® AD and SD Mini-breakers
  • Overtemperature Protection for USB Type-C Cables
  • Bourns Protecting Li-Ion Batteries with Thermal Cut Off Devices