Passives

Varistors feature increased permissible operating temperature

8th August 2017
Lanna Cooper

 

TDK has presented leaded EPCOS metal oxide disk varistors, which have now been approved for an increased operating temperature of 105°C (previously 85°C). The reason for this is the recertification of the B722* series of varistors in accordance with UL 1449, 4th Edition, and IEC 61051.

Raising the permissible operating temperature to 105°C also changes the climate category from 40/85/56 to 40/105/56. The flammability of the epoxy enclosure complies with UL 94 V-0.

The monolithic EPCOS varistors are available with rated voltages of between 11VRMS and 1,100VRMS and, depending on type, can withstand surge currents of up to 20kA (8/20µs). To assist in the design process, PSpice libraries are available here.

Main applications:

  • Power supplies and converters for industrial electronics applications, as well as household appliances and telecommunication devices.

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