The Fairchild/ON Semiconductor HMHA281 is a transistor output optocoupler with an isolation voltage of 3750Vrms. It is designed for use in power management, signal processing, and industrial applications. The optocoupler has a maximum forward voltage of 1.3V and a Vce saturation of 400mV. It has a minimum DC current transfer ratio of 50% at 5mA and a maximum DC current transfer ratio of 600% at 5mA. The switching turn-on and turn-off time is not specified, but the rise and fall time is 3μs. The optocoupler has a maximum output voltage of 80V and a channel output current of 50mA. It is packaged in a 4-mini-flat package and is available in reel packaging. The HMHA281 is an active product with a medium popularity and a limited supply and demand status.