Cheap And Discounts 10PCS A3120 A3120V HCPL3120 HCPL-3120 DIP-8 Optocoupler optocoupler patch Wholesale. Buy Directly From Merchant Shenzhen ZeXinYuan Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.