Part Number: 1N4625UR-1 (Diode zener single 51v 5 500mw 2)Part Number: 2504035-251 (Diode zener single 51v 5 500mw 2)Part Number: 32000040-309 (Diode zener single 51v 5 500mw 2)Part Number: 53002115-5 (Diode zener single 51v 5 500mw 2)Part Number: JANTX1N751AUR-1 (Diode zener single 51v 5 500mw 2)Part Number: JANTX1N978B-1 (Diode zener single 51v 5 500mw 2)