Raychem Circuit Protection, a business unit of Tyco Electronics, has announced the introduction of its PolyZen
TMpolymer enhanced, precision Zener diode micro-assembly. Designed to meet the growing need for overcurrent and overvoltage protection on portable equipment that utilizes barrel jacks for DC power input, the PolyZen device helps protect sensitive electronics from damage caused by inductive voltage spikes, voltage transients, incorrect power supplies and reverse bias.
The new PolyZen device helps provide coordinated protection with a component that protects like a Zener diode, but is capable of withstanding very high power fault conditions. The PolyZen micro-assembly 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 overcurrent events by transitioning from a low to high resistance state.
The RoHS-compliant device offers power handling on an order of 100 watts in a 4mm package and helps provide DC power port protection for portable electronics and systems using barrel jacks for power input, as well as internal overvoltage protection and transient suppression.
PolyZen devices help provide resettable protection against multi-watt fault events and requires 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 of this innovative solution include:
- Helps prevent warranty returns and customer complaints from power bus related incidents
- Helps shield downstream electronics from overvoltage and negative bias conditions
- Helps reduce design costs with single component placement and minimal heat sinking requirements
"The PolyZen device's resettable functionality and its ability to withstand high current inrush make it suitable for portable electronics and other low-power DC devices," said Adrian Mikolajczak, new platform and technology marketing manager for Raychem Circuit Protection. "In addition to extended performance range and survivability, integrated device construction reduces heat sinking requirements and streamlines circuit design."
PolyZen devices are compatible with industry standard installation procedures, and are available in tape and reel packaging for compatibility with high-volume manufacturing. For further information or technical assistance, call (800) 227-7040, or www.circuitprotection.com
Price: $0.27 in quantities of 100k units/year
Availability: Samples available now
Delivery: 8-10 weeks ARO
