PolyZen™ Circuit Protection Devices

TE Connectivity
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PolyZen™ devices are polymer enhanced precision Zener diode micro-assemblies that help protect sensitive electronics from damage caused by inductive voltage spikes, voltage transients, incorrect power supplies and reverse bias. The PolyZen micro-assembly incorporates a stable Zener diode for precise voltage clamping and non-linear resistance, polymeric positive temperature coefficient (PPTC) layer that responds to either diode heating or overcurrent events by transitioning from a low to high resistance state.


  • Over-voltage transient suppression
  • Stable Vz versus fault current
  • Time delayed, over-voltage trip
  • Time delayed, reverse bias trip
  • Power handling on the order of 100W
  • Integrated device construction
  • Stable Zener diode helps shield downstream electronics from overvoltage and reverse bias
  • Analog nature of trip events minimizes upstream inductive spikes
  • Minimal heat sinking requirements
  • Single component placement
  • Helps reduce warranty returns and replacement costs
  • RoHS Compliant


  • Portable media players
  • Global positioning systems
  • Hard disk drives 5V & 12V bus
  • Solid state Drives (SSD) 5V bus
  • Cellphone charger port and USB power
  • Automotive peripheral input power
  • DC power port protection
  • Industrial handheld POS