PolySwitch™ Circuit Protection Devices

TE Connectivity

More than 15 years ago, Raychem Circuit Protection introduced the SMD product family, and polymeric PTC devices quickly became the computer industry standard for keyboard, mouse, and disk drive protection. In 1995, Raychem Circuit Protection advanced the technology, reducing the size and cost of surface-mount resettable PTC devices with the introduction of its mini-SMD product family. The surface-mount family now includes the nano-SMD series, which reduces the size to a 3216mm (1206mils) foot print, one-third the size of the popular mini-SMD series. Other products of this family are the mini-SMD and micro-SMD series.


  • Small size saves board space and cost
  • Many product choices give engineers more design flexibility
  • Assists in meeting regulatory requirements
  • Higher voltage ratings allow use in new applications
  • RoHS compliant versions available
  • Current ratings from 0.05 to 3A
  • Agency recognition: UL, CSA, TUV
  • Small footprint
  • Fast time-to-trip
  • Low resistance
  • Compatible with high-volume electronics


  • Computer Motherboards
  • Modems
  • USB Hub, Ports, & Peripherals
  • IEEE1394 Ports
  • Digital Cameras
  • Disk Drives
  • CD-ROMs
  • Game Machines
  • Battery Packs
  • Phones
  • Fax Machines
  • Analog & Digital Line Cards
  • Printers
  • PDAs
  • Chargers