PTC thermistor provides resettable short-circuit protection

The surface-mount PRG series from Murata provides a flexible set of trip-current options. Compact dimensions make these thermistors suitable for use in space-constrained products such as smartphones.

The PRG series of positive temperature coefficient (PTC) thermistors operates as a resettable fuse, protecting circuits against the risk of damage caused by short-circuits or other over-current events. 

Unlike conventional electrical fuses, the PRG series thermistors return to their normal state after the over-current has abated, and so provide continuous protection without the need for replacement. 

Constructed from ceramic material, these thermistors provide a fast and reliable response to over-currents, and are more durable than chip resistors or alternative thermistor types manufactured with organic materials.

The PTC thermistors in the PRG series offer a wide range of trip-current ratings, maximum operating-current ratings up to 37.5 A and voltage ratings up to 30 V dc. The thermistors are available in three case sizes: 

  • 1.0 mm x 0.5 mm
  • 1.6 mm x 0.8 mm
  • 2.0 mm x 1.25 mm
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