The TOSHIBA TLP781 consists of a silicone photo−transistor optically coupled to a gallium arsenide infrared emitting diode in a four lead plastic DIP (DIP4) with having high isolation voltage(AC: 5kVRMS (min)).
东芝 TOSHIBA
The TOSHIBA TLP621, −2 and −4 consists of a photo−transistor optically coupled to an infrared emitting diode.