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Multi-stage protection for DC power ports and sensitive Electronics

15th February 2007

ES Admin

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Now available from TTI Europe, the world’s leading authorized specialist distributor of passive, connector and electromechanical components, Raychem Circuit Protection’s PolyZen™, a polymer-enhanced, precision Zener diode micro-assembly, is designed to meet the growing need for over-current and over-voltage protection on portable equipment that uses barrel jacks for DC power input. PolyZen helps protect sensitive electronics from damage caused by inductive voltage spikes, voltage transients, incorrect power supplies and reverse bias.

The component incorporates a stable Zener diode for precise voltage clamping and a resistively non-linear, polymer positive temperature coefficient (PPTC) layer that responds to either diode heating or over-current events by transitioning from a low to high resistance state. Devices are capable of withstanding very high power fault conditions.

PolyZen devices are resettable, so they are effective against multi-watt fault events. 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 secondary protection elements, effectively increasing the diode’s power handling capacity.

These RoHS-compliant devices offer power handling up to 100 watts in a 4mm package and dissipate only 0.7W.