SMD PPTCs Prevent Cable Overheating During Smartphone Charging


Littelfuse has unveiled SMD PPTC devices that provide protection for charging cables and connectors from heat generated due to faults within the cable connector or port. 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. This is especially important in fast-charging applications that use higher voltages and currents, such as smartphones, tablets and laptop computers, TVs and set-top boxes, cameras, and video game consoles.

The new surface mount PPTC devices combine low resistance, compact size, higher voltage, overcurrent/overtemperature protection, and resettability

The firm notes that with connector sizes getting smaller, pin-to-pin spacing is also getting smaller. This 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.

In order to prevent this situation, the new LoRho Series PPTC can be placed on the connector’s Vbus line to sense the temperature rise and stop the charging process until the contamination is removed. Once the fault is corrected, the device automatically resets.

“The LoRho Series SMD PPTC offers an advantage over devices that offer only overcurrent protection because not all faults result in a higher current. Having both overcurrent and overtemperature protection is critically important to safeguarding users of charging cables,” said Vincent Wu, global product manager at Littelfuse. “Never before has this low resistance, compact size, voltage level, overcurrent and overtemperature protection, and resettability been combined in a single device.”

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The firm boasts the key benefits offered by the new products as:-

  • Surface mount design is compatible with reflow soldering processes, which allows for reduced assembly time and cost vs. leaded and strapped devices.
  • 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.
  • Well-suited for use in fast-charging applications up to 12Vdc and 4.5A Ihold.

The new LoRho Series SMD PPTCs are available in 1206- and 1210-size surface mount packages in tape and reel format in quantities of 15,000.

For further details, view the full Press release.


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