OPTOCOUPLER PC817 OC optical coupler JC817 replace for PC817 ,P521 series JC817M ,JC817S ,JC817S1 CQC UL ,CSA ... an NPN silicon,phototransistor2. The lead pitch is 2.54mm3. Replace for PC817 ,P521 series- Applications: 1. Computer terminals.2. ... solid state relay, household use equipment, switching power supply2.It can replace H11C series, TLP541, LP741, TLP747 directly3.Compliant with RoHS standard4 ...