Dioda Zenera; Vz 240V; Pd 5W; Vf 1.5V; If 1.0A; Izt 5mA; Zz@Izt 650R; Ir 0.4A; LC 2uA; Top -65*C +175*C; SOD57; Microsemi 1N4991 Voidless-Hermetically-Sealed 5 Watt Glass Zener Voltage Regulator Diode military qualified for high-reliability applications datasheet: datasheetspdf.com/pdf-file/1122461/Microsemi/1N4991/1