Würth Elektronik Optocoupler Phototransistors feature a 5kV isolation voltage rating, fast switching time, and good stability of inner isolation. The WL-OCPT series is an IR LED and phototransistor in one package and offers a stable Current Transfer Ratio (CTR) in full operating with different CTR binnings available. Würth Elektronik Optocoupler Phototransistors are ideal for power supplies, office equipment, instrumental applications, computers, and microprocessors.