Glass-encapsulated varistors provide advanced circuit protection in harsh applications

June 21, 2013 // By Paul Buckley
AVX Corporation has expanded both the company's TransGuard and Automotive TransGuard Series multilayer varistors to include glass-encapsulated, acid-resistant parts for use in high energy and harsh environment commercial, industrial, and automotive applications.

Exhibiting non-linear, bi-directional, V-I characteristics, both zinc-oxide-based ceramic semiconductor device series provide bi-directional over-voltage protection and EMI/RFI attenuation in a single SMT package.  The series also feature multi-strike capability, sub 1 nS response to ESD strikes, and excellent solderability.    

Ideal for use in harsh environments – such as those utilizing acid, salt, or chlorite flux – AVX’s glass-encapsulated TransGuard and Automotive TransGuard Series varistors are available in three case sizes (1210, 1812, and 2220), four energy ratings (spanning 2-12J) and feature a peak current rating of up to 2000 A.  Both series also have Ni/Sn-plated terminations, are RoHS compliant, are rated for use in temperatures spanning -55°C to +125°C, and are packaged on 7 inch or 13 inch reels.  

TransGuard Series varistors are available in four working voltages (16, 22, 28, and 65 VDC), four clamping voltages (42, 44, 77, and 135 V), and can be employed in a range of professional, industrial, and commercial applications, including: IC protection, DC motor protection, relays, controllers, sensors, smart grids, and alarms, among others.  

Available in four working voltages (16, 34, and 65 VDC) and three clamping voltages (42, 77, and 135 V), Automotive TransGuard Series varistors exhibit high current and energy handling capabilities, are AEC-Q200-qualified, and are ideal for use in a variety of automotive applications typical of internal combustion, hybrid electric, plug-in hybrid electric, and commercial vehicles.  The series can also provide advanced circuit protection in sensor, relay, LIN BUS, ECU, and DC motor applications.  

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