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Rad Hard TVS devices tackle harsh environment apps

Posted: 25 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:multilayer varistor? mlv? avx? transient voltage suppressor? tvs?

Based on a multilayer varistor (MLV) concept and zinc oxide material systems, AVX Corp. has developed a new series of radiation resistant transient voltage suppressors (TVS) for military and harsh environment applications. Designated the MG and V2F series, the new rad hard TVS devices are available in case sizes as small as 0402 to as large as 2220.

"The MLVs offer significant advantages to design engineers in military applications and in harsh environments. Among those advantages are high inrush capability, repetitive strike capability, fast turn on time and small size," said AVX's applications engineering manager, Ron Demcko, in a statement. "AVX MLVs are reliable and offer accuracy and repeatability in harsh environments such as aircraft, spacecraft sensors and oil exploration equipment in part because they are radiation resistant."

Under neutron fluence and gamma total dose environments, the MLVs have been characterized as radiation resistant. Test results show that multiple element array (MultiGuard) and TransFeed LC-T MLV configurations withstand neutron fluence fields of up to 5 x 1012 (N/cm?) with virtually no change in breakdown voltage. Breakdown voltage is the value of DC voltage that drives the MLV into a 1mA current conduction state. MultiGuard and TransFeed devices also have little breakdown voltage variation when exposed to 10krads of gamma radiation.

This data is generated for the most size efficient MLV packages (MLV arrays and MLV feedthru filters) AVX offers. These configurations can save designers up to 90 percent of the board area compared to discrete solutions and offer a 50 percent weight reduction.

Pricing starts at 18 cents for a 0508 four-element device in quantities of 10,000.

- Gina Roos


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