TDK has introduced 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 11 VRMS and 1100 VRMS and, depending on type, can withstand surge currents of up to 20 kA (8/20 μs). To assist in the design process, PSpice libraries are available under www.epcos.com/tools_mlv
The varistors are well suited for the protection of power supply and converter inputs for industrial electronics applications, as well as household appliances and telecommunication devices.
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