Varistors combine circuit protection & EMI/RFI attenuation

23rd January 2015
Siobhan O'Gorman

Combining circuit protection and EMI/RFI attenuation functions in a single device, the VR20 varistors have been released by AVX. The TransGuard automotive devices are based on the company’s patented multilayer varistor technology, which provides bi-directional transient voltage protection in the on-state and EMI/RFI attenuation in the off-state. 

The varistors’ combination of circuit protection and EMI/RFI attenuation functions allow designers to both reduce component count and save board space. The VR20 varistors are AEC-Q200 qualified, operate across a temperature range of -55 to +125°C and feature a robust construction with conformal epoxy coating, making them particularly suitable for use in inductive switching, DC motors, water and fuel pumps and relays.

Available in three working voltages (18V, 26V, and 48V), four clamping voltages (42V, 54V, 60V, and 100V) and three energy ratings (0.7J, 1.2J, and 1.6J), the devices are rated for 25kV ESD. The RoHS compliant feature Ni/Sn leads and can be shipped in bulk or packaged on tape and reel. Nickel-free leads are available upon request.

“AVX’s radial leaded TransGuard automotive series features the smallest varistors available on the market, offering compact height and thickness specifications superior to those of equivalent leaded disc varistors. With the addition of the VR20 varistors, the series also provides design engineers with a broader range of voltage and energy rating options in radial leaded configurations, complementing our high temperature radial leaded TransGuard series varistors by expanding both the number and type of applications the series suitable for,” commented Jiri Machanicek, Product Manager, AVX.

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