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Littelfuse Adds New Temperature Indicators For USB Type-C Connectors

USB Type-C ConnectorsLittelfuse has made a new addition to the PolySwitch setP series of digital temperature indicators, designed to protect USB Type-C and USB power delivery charging cables from dangerous overheating.

The latest addition to the product family, the SETP0805-100-CC, is optimized for use in cables equipped with USB Type-C connectors at both ends.

Typical applications for SETP0805-100-CC temperature indicators include consumer electronics, primarily for mobile and wearable devices equipped with:

  • USB Type-C cables (with a Type-C plug on each end)
  • USB Type-C chargers (such as cables fixed or captive to a charger “brick” for laptops)

Dust, dirt, or other debris trapped in a USB Type-C cable connector or the connector deformed pins, creates a resistive fault from the power line to ground, which can cause a dangerous temperature rise without increasing the current. When the temperature reaches the setP’s indicating temperature (100°C), the setP switches from low resistance to very high resistance, shutting down the flow of power. Once the user disconnects the cable and removes the debris, the cable can resume normal operation.

The compact 0805 (mils) footprint of setP temperature indicators makes them at least 50 percent smaller than other solutions that require placing a device on the power line. The setP devices can be used to protect cables designed for 100 W of power or more.

“This new addition to the series offers the smallest, most energy-efficient solution available on the market, making it simpler than ever to protect people and electronics against overheating.”, said Stephen Li, Global Product Manager at Littelfuse.

The Key Benefits Provided by the Temperature Indicators include:

  • Their compact size and sensitivity to temperature helps to simplify keeping the cable surface temperatures safe for users.
  • The rigid structure is compatible with conventional assembly and molding operations used in cable and connector manufacturing.
  • Being independent of power simplifies part selection and allows protecting systems that operate at 100 W of power or more.
  • No disruption of the communication channel makes the setP an easy drop-in solution for reliable over temperature protection for existing designs.


Both the original (single-end) setP series digital temperature indicator (part number SETP0805-100-SE) and the latest version (part number SETP0805-100-CC) are available as surface mount devices in tape and reel packaging in packs of 4,000 with a minimum order quantity of 20,000 pieces. Sample requests may be placed through authorized Littelfuse distributors worldwide.

Further Information: Click here


Jyoti Gazmer

A Mass Comm. graduate believes strongly in the power of words. A book lover who dreams to own a library some day. An introvert but will become your closest friend if you share mutual feelings about COFFEE. I prefer having more puppies over humans.

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