... replace for PC817 ,P521 series JC817M ,JC817S ,JC817S1 CQC UL approved ,CSA approved High Density Mounting Type Photocoupler optical coupler JC817 OC PC817 ... Ω)4. Package type: dual-in-line package5. CQC approved6. UL approved7. CSA approved- Description 1. The JC817 series are optically coupled isolators ...