The EL817 Series of devices each consist of an infrared emitting diodes, optically coupled to a phototransistor detector. They are packaged in a 4-pin DIP package and available in wide-lead spacing and SMD option.
Features
Current transfer ratio (CTR: 50~600% at IF =5mA; VCE =5V)
High isolation voltage between input and output (Viso=5000 V rms )