OC optical coupler JC817 replace for PC817 ,P521 series JC817M ,JC817S , ... ,CSA approved High Density Mounting Type Photocoupler optical coupler JC817 OC PC817 - Basic Features: 1. Current transfer ratio (CTR: MIN. 50 ... with RoHS standard4.High isolation voltage between input and output OC optical coupler JC817