Working With Optically-Isolated Relays

August 26, 2013
By Anonymous

Not so long ago, all relays performed their switching duties through electromechanical means. Today, however, engineers can also opt for solid-state relays that use semiconductors to switch their output circuits. The choice between traditional electromechanical relays and the solid-state varieties comes often comes down to reliability and performance. With no moving parts, solid-state relays avoid all the obvious mechanical failure modes associated with traditional relays. They also tend to offer desirable electrical characteristics and design Optically-Isolated Relays - PhotoMOS - Panasonic Industrial Devicesadvantages including:

  • Low power consumption.
  • Low leakage current.
  • Stable on-resistance over lifetime.
  • High reliability with extremely long life.
  • Small size.
  • Fast switching speeds.
  • High vibration and shock resistance.
  • No contact bounce or switching noise.

Keep in mind that solid-state are not created equal when it comes to these performance advantages. Optically-isolated relays, in particular, can outshine other solid-state devices that use electrical or magnetic operating principles. To learn more about the operating principles of optically-isolated relays, how to apply them in different applications and how to maximize their long life cycles, download our white paper.