TDK Corp. announced that its leaded EPCOS metal-oxide disk varistors have now been approved for an increased operating temperature of 105°C (previously 85 °C). The reason for the change is the recertification of the B722 Series 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 1,100 VRMS and, depending on type, can withstand surge currents of up to 20 kA. To assist in the design process, PSpice libraries are available under www.epcos.com/tools_mlv.
The varistors are suited for the protection of power-supply and converter inputs for industrial electronics applications as well as household appliances and telecommunication devices.