POLYZEN DEVICES Polymer Protected Zener Diode

2019-05-23
PolyZen devices are polymer-enhanced, precision Zener

diodes. They offer resettable protection against multi-Watt

fault events without the need for multi-Watt heat sinks.

The Zener diode used for voltage clamping a PolyZen

device was selected due to its relatively flat voltage

vs. current response. This helps improve output voltage

clamping, even when input voltage is high and diode

currents are large.

An advanced feature of the PolyZen device is that the

Zener diode is thermally coupled to a resistively nonlinear,

PPTC (polymer positive temperature coefficient)

layer. This PPTC layer is fully integrated into the device

and is electrically in series between VIN and the diode

clamped VOUT.

This advanced PPTC layer responds to either extended

diode heating or overcurrent events by transitioning from a low to high resistance state, also known as “tripping.” A

tripped PPTC will limit current and generate voltage drop. It helps to protect both the Zener diode and the follow-on

electronics and effectively increases the diode’s power handling capability.

The polymer-enhanced Zener diode helps protect sensitive portable electronics from damage caused by inductive

voltage spikes, voltage transients, incorrect power supplies and reverse bias. These devices are particularly suitable for

portable electronics and other low-power DC devices.

Littelfuse

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Part#

POLYZEN DEVICESPolymer Protected Zener Diode

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DC power port protection in portable electronics ]DC power port protection for systems using barrel jacks for power input ]Internal overvoltage and transient suppression ]DC output voltage regulation ]Tablet PCs and portable electronics ]

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Datasheet

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ELV 、 ESD(HBM, 15kV) 、 Halogen free 、 Pb-Free 、 RoHS

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Please see the document for details

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English Chinese Chinese and English Japanese

2016/11/23

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