Optocuplor / Phototransistor optically coupled 80V 60mA 5kV iso/ Gallium arsenide infrared-emitting diode in a 4-lead LSOP4 package. Cross Reference: 617A3 617A8X 618A3 EL1017 EL1018-VG EL1019 TCLT1018 VOL617 VOL618
