Power Innovations SP7180F3S 3-point overvoltage protector

Manufactured by Power Innovations - Part # SP7180F3S - SIL Through-Hole package

The SP7xxxF3 series are 3-point overvoltage protectors designed for protecting against metallic (differential mode) and simultaneous longitudinal (common mode) surges. Each terminal pair has the same voltage limiting values and surge current capability. This terminal pair surge capability ensures that the protector can meet the simultaneous longitudinal surge requirement which is typically twice the metallic surge requirement

Each terminal pair has a symmetrical voltage-triggered thyristor characteristic. Overvoltages are initially clipped by breakdown clamping until the voltage rises to the breakover level, which causes the device to crowbar into a low-voltage on state. This low-voltage on state causes the current resulting from the overvoltage to be safely diverted through the device. The high crowbar holding current prevents d.c. latchup as the diverted current subsides.These protectors are guaranteed to voltage limit and withstand the listed lightning surges in both polarities.

These medium and high voltage devices are offered in nine voltage variants to meet a range battery and ringing voltage requirements. They are guaranteed to suppress and withstand the listed international lightning surges on any terminal pair.

These devices are three terminal overvoltage protectors. They limit the voltage between three points in the circuit. Typically, this would be the two line conductors and protective ground. Protectors Th2 and Th3 limit the maximum voltage between each conductor and ground to the ±V(BO) of the individual protector. Protector Th1 limits the maximum voltage between the two conductors to its ±V(BO) value.

7180F3 V(DRM) = 145V V(BO) = 180V