DESCRIPTION
The optically coupled isolator SFH 609 features a high current transfer ratio as well as high isolation voltage, and uses as emitter a GaAs infrared emitting diode which is optically coupled with a silicon planar phototransistor acting as detector. The  component is incorporated in a plastic plug-in package 20 A 6 DIN 41866.

The coupling device is suitable for signal transmission between two electrically separated circuits. The potential difference between the circuits to be coupling is not allowed to exceed the maximum permissible isolation voltage.