PolyZen Devices
PolyZen Devices
Polymer Protected Zener Diode
PolyZen devices are polymer enhanced precision Zener
diode micro-assemblies that help protect sensitive
electronics from damage caused by inductive voltage
spikes, voltage transients, use of incorrect power supplies
and reverse bias.
The PolyZen micro-assembly incorporates a stable
Zener diode for precise voltage clamping and a
resistively non-linear, polymeric positive temperature
coefficient (PPTC) layer that responds to either diode
heating or overcurrent events by transitioning from a
low to high resistance state.
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PolyZen devices help provide resettable protection
against damage caused by multi-watt fault events and
require only 0.7W power dissipation. In the event of
sustained high power conditions, the PPTC element of
the device “trips” to limit current and generate voltage
drop. This functionality helps protect both the Zener
and the follow-on electronics, effectively increasing the
diode’s power handling capacity.
Benefits
• Helps shield downstream electronics from overvoltage
and reverse bias
• Trip events shut out overvoltage and reverse bias
sources
• Analog nature of trip events minimize upstream
inductive spikes
• Helps reduce design costs with single component
placement and minimal heat sinking requirements
Features
• RoHS compliant
• Overvoltage transient suppression
• Hold currents up to 2.3A
• Time delayed, overvoltage trip
• Time delayed, reverse bias trip
• Power handling on the order of 30 watts
• Integrated device construction
Applications
• 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
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