Catalogue AVX Zinc Oxide Varistors Catalog
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Zinc Oxide Varistors
Reliability
PRODUCT QUALITY ASSURANCE
AVX has a Quality System that complies with the ISO & CECC quality requirements.
All products are tested and released by the quality depart­ment based on the compliance to established customer specifications. Critical raw materials are inspected for dimen­sional, electrical and physical properties prior to releasing to the production floor.
Routine checks are carried out at crucial processes. The finished products are submitted to Quality Control for inspec­tion on electrical, dimensional, physical & visual conformance to relevant specifications, based on established AQLs.
The average outgoing quality level is < 10ppm on AVX varistors. The low ppm value is applicable for total function­al failures, i.e. short circuit and open circuit.
RELIABILITY
AVX varistors are subjected to reliability tests stated In page 37 (per CECC 42000).
Life test is conducted to determine the life time of varistors. The test conditions used are stated in page 00. The varistors are subjected to these conditions for a minimum period of 1000 hours.
Failure in time (FIT) is computed for all tested parts based on Arrhenius equation. The definition of failure is a shift in the nominal voltage exceeding ± 10%. The FIT calculation is computed in units of 10-9/h.
Figures below give the FIT for low and high voltage varistors. The FIT values at various stresses are extrapolated based on Arrhenius equation.
FIT OF VARISTORS (Vrms > 4(
100,000
10,000
E i-
1,000
100
LL LL
10
1
40
60 80
Temperature (°C)
100
1,000,000 100,000
120
FIT OF VARISTORS (Vrms </= 40 V)
e)
E i-
10,000
e
r
LL
1,000
100
10
1
20
40 60 80
Temperature (°C)
100
120
36
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