Cheap And Discounts 10pcs/Lot TPS54331DR SOP-8 MARKING;54331 Switching Voltage Regulators 3A 28V In Step Down SWIFT DC/DC Cnvrtr Wholesale. Buy Directly From Merchant CJXY221012 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.