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