Littelfuse setP™ Temperature Indicators Provide Improved Prevention of Overheating Damage to USB Type-C Connectors

Expanded portfolio helps prevent resistive faults in cables with USB
Type-C connectors on each end

(NASDAQ: LFUS) a global manufacturer of leading technologies in
circuit protection, power control and sensing, today announced an
expanded PolySwitch® setP™ series of digital
temperature indicators, designed to protect USB Type-C and USB power
delivery charging cables from dangerous overheating. The newest 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

  • 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)

When dust, dirt, or other debris becomes trapped in a USB Type-C cable
connector or the connector has deformed pins, it 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.

Market experts estimate the number of consumer electronics, wireless,
and computing devices equipped with USB Type-C connectors sold each year
will reach 5 billion by 2021, spurring demand for solutions that can
protect cables and connectors from overheating damage,” said Stephen Li,
Global Product Manager at Littelfuse. “Like the original setP, 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.”

The setP temperature indicators offer these key benefits:

  • 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 overtemperature protection for existing


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. For a listing of Littelfuse distributors, please

For More Information

Additional information is available on the setP
series digital temperature indicator product page
. For technical
questions, please contact: Stephen Li, Global Product Manager at
Littelfuse, [email protected].

About Littelfuse

Littelfuse (NASDAQ: LFUS) is a global manufacturer of leading
technologies in circuit protection, power control and sensing. Sold in
over 150 countries, our products are found in automotive and commercial
vehicles, industrial applications, data and telecommunications, medical
devices, consumer electronics and appliances. Our 12,000 worldwide
associates partner with customers to design, manufacture and deliver
innovative, high-quality solutions, for a safer, greener, and
increasingly connected world – everywhere, every day. Learn more at



Media Contact:
Kristina Hodgson
Global Marketing
Communications Manager
Electronics Business Unit, Littelfuse, Inc.
[email protected]

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