SMT PPTC devices prevent charging cables overheat

May 15, 2017 // By Julien Happich
Littelfuse's PolySwitch LoRho Series SMD PPTC provides protection for charging cables and connectors from heat generated due to faults within the cable connector or port.

As connector sizes get smaller, so does pin-to-pin spacing, which increases the chance that dirt, dust, water and other debris will collect between the pins, and cause an electrical fault. Such faults can generate high levels of heat, which can damage charging cables and the devices being charged, as well as injure users. However, when a LoRho Series PPTC is placed on the connector’s Vbus line, the device will sense the temperature rise and stop the charging process until the contamination is removed. Once the fault is corrected, the device automatically resets. 
Typical applications for the LoRho Series SMD PPTCs include protecting charging cables and connectors with a small pin pitch (pin-to-pin dimensions), such as microUSB and USB-C. Compact 1206- and 1210-size packages save printed circuit board space at the USB-C connector and ensure the USB-C plug meets USB-IF dimension specifications. The devices are suitable for use in fast-charging applications up to 12Vdc and 4.5A Ihold.

Littelfuse –


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