Varistors with Operating Temperature Increased to 105 C
TDK Corporation presents 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 1100Vrms and, depending on type, can withstand surge currents of up to 20kA (8/20µs). To assist in the design process, PSpice libraries are available.
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.
Main features and benefits include: Increased permissible operating temperature of 105 °C; Wide range of rated voltages from 11Vrms to 1100Vrms; and High surge current capability of up to 20kA (8/20µs).
