The Vishay ILQ621 is an opto-coupler, or optical isolator, with a solid-state output. It has a high insulation voltage of 10,000V and a working temperature range of -40 to +125 degrees Celsius. The input consists of an infrared LED and a detector. The output is adapted from the silicon phototransistor, which offers a high speed response and a very low saturation voltage. This device is an optimal choice for applications requiring low power consumption and high-speed isolation. It is widely used in consumer and industrial applications such as motor control, home appliance control, safety devices, and in instrumentation.