Cheap And Discounts 100 Pieces New Transistor PCR406 PCR406J PCR606 BC639 BC640 BC237B BC238B TO-92 Unidirectional Thyristor IC Wholesale. Buy Directly From Merchant Shop1104629624 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.