Major Brands 1N751A-VP Zener Diode, Single, 5.1 Volt, Tolerance 5%, 500mW, 2-Pin, 1.91 mm H x 4.56 mm L x 1.91 mm W (Pack of 50): Amazon.com: Industrial & Scientific
Pack of 100 Pieces) Chanzon 1N4734A 1N4734 Power Zener Diode 1W 5.6V DO-41 (DO-204AL) Axial Diodes 1 Watt 5.6 Volt 5V6: Amazon.com: Industrial & Scientific