Product category:
Circuit Protection Devices
News Release from: Raychem Circuit Protection | Subject: PolyZen
Edited by the Electronicstalk Editorial
Team on 29 February 2008
Polymer-enhanced diodes co-ordinate
protection
By clamping and smoothing inductive voltage spikes, PolyZen devices help shield downstream electronics from overvoltage and reverse bias.
Tyco Electronics has added two new devices to its popular PolyZen line of polymer-enhanced precision Zener diode microassemblies The new devices feature a higher hold current (2.3A) and are designed to help protect circuits in global positioning systems (GPS), smart phones, game consoles, portable media players (PMPs) and other video-based peripherals that can be charged in the car
This article was originally published on Electronicstalk on 15 Sep 2006 at 8.00am (UK)
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The PolyZen microassembly incorporates a stable Zener diode for precise voltage clamping and a resistively nonlinear, 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 device helps provide co-ordinated protection with a component that protects like a Zener diode, but is capable of withstanding very high power fault conditions without requiring any special heatsinking structures beyond normal printed circuit board traces.
By clamping and smoothing inductive voltage spikes, PolyZen devices help shield downstream electronics from overvoltage and reverse bias.
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Raychem's new Thin-Strap line of PolySwitch resettable fuses provides enhanced protection for rechargeable battery packs typically used in cell phones, laptops and other portable equipment.
Additionally, their high power absorption capability protects against faults that occur when using an incorrect or misconnected power supply.
Because PMPs offer larger display panels and video processing capabilities, they require more power and draw higher current than prior-generation portable devices.
Multiple interfaces and charging systems can also expose these devices to damage caused by misconnection of the 5 and 12V lines.
The new PolyZen devices are capable of withstanding the high inrush currents and faults associated with the new technology, and are available in a small form factor that is suitable for PMPs.
"Portable digital entertainment is quickly making the leap from audio-centric devices such as MP3 players to multimedia products that play video and digital images".
"This shift is putting portable media players at the centre of the digital lifestyle", says Tuan Tran, Global Product Manager for Tyco Electronics.
"The new PolyZen devices with higher hold currents help consumer electronics manufacturers meet safety requirements, enhance customer satisfaction and reduce warranty costs in the rapidly expanding PMP market".
PolyZen devices are compatible with industry standard installation procedures, and are available in tape and reel packaging for compatibility with high-volume manufacturing.
List price is US $0.45 per piece in quantities of 100,000 units per year.
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