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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, 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.

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.

• 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

• 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

• Portable media players

• Global positioning systems

• Hard disk drives 5V & 12V bus

• Solid State Drives (SSD) 5V bus

PolyZen Devices

Polymer Protected Zener Diode

Benefits

Features

Applications

• Cellphone charger port and USB power

• Automotive peripheral input power

• DC power port protection

• Industrial handheld POS

NOT the LATEST

REVISION

OBSOLETE