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Littelfuse Unveils setP Temperature Indicator at Electronica India 2018

Compact, fully compliant drop-in solution for USB Type-C plugs and USB Power Delivery

LittelfuseLittelfuse introduced the PolySwitch setP Series Temperature Indicator, which protects the users of USB Type‑C and USB Power Delivery charging cables from dangerous overheating.

The announcement was made in the Littelfuse booth (Hall 4, Booth ED45) at Electronica India, held September 26–28, 2018, at the Bangalore International Exhibition Centre (BIEC) in Bengaluru, India.

When dust, dirt or other debris becomes trapped in a USB Type-C cable connector, it creates a resistive fault from the power line to ground, which can cause a dangerous temperature rise without increasing the current. The power-independent setP senses the temperature increase, alerting the charging port to shut down the power flow. Once the user disconnects the cable and removes the debris, the cable can resume normal operation.

The compact 0805 (mils) footprint of the setP Temperature Indicator makes it at least 50 percent smaller than other solutions that require placing a device on the power line. Placing a protective device on the power line also contributes to power loss. The same setP device can be used to protect cables designed for 15W, 60W or 100W operation.

The Key Applications for the setP Series Temperature Indicator include:

“The setP offers the smallest, most energy-efficient solution available on the market, helping to provide protection against overheating said Todd Phillips, Global Market Manager, Electronics Business Unit at Littelfuse. “USB Type-C can support high power levels, which makes this protection solution especially important.”

The Key Advantages of the setP Series Temperature Indicator include:

  • The compact size and sensitivity to temperature help 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 USB power delivery allows for a smaller footprint and greater energy efficiency and simplifies part selection.
  • No disruption of the communication channel makes the setP an easy drop-in solution to existing designs.


The setP Series Temperature Indicator (part number SETP0805-100-SE) is available as a surface mount device 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 is available on the setP Series Temperature Indicator product page


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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