The latest Metal Oxide Varistor (MOV) planar arrays from Syfer Technology deliver comprehensive protection against lightning strikes and other transient events in military, aerospace and other safety critical applications. Incorporated into the connectors on the external wall of the subsystem, the devices are key to protecting the increasing volume of sensitive electronic circuitry found in today’s complex systems.
MOVs are suitable for protecting against several types of transient event. With a material response time of less than 500ps, no leads/tracks, and a low inductance geometry MOVs are more than capable of suppressing lightning induced transients. The devices are also ideal for protection against voltage spikes caused by power supply glitches and noisy switching circuits.
Operating over the full military temperature range from -55°C to +125°C, the devices are specified with leakage current of 5μA at +25°C, 50μA at +125°C, and with maximum working voltages from 10 to 45Vdc, and 7 to 35Vac.
Capacitance, measured at 1Vrms at 1kHz, depends on working voltage, planform, hole size and unit thickness, but typically ranges from 3nF at 10Vdc, 7Vrms to 500pF at 45Vdc 35Vrms. In operation, the MOV acts as a high value resistor, such that once the voltage reaches a certain value, the device becomes highly conductive and provides a fast and efficient short circuit route to ground to limit surges or pulses, and dissipating potentially destructive energy as heat. With the MOV Planar Array’s inherent capacitance, it can be used as a simple C filter or as one half of a Pi or unbalanced Pi filter.
When used together with Syfer’s Capacitor Planar Arrays, the MOV planars can provide a complete over-voltage transient protection and EMI filtering solution to connector manufacturers. Devices are RoHS compliant.