This part is a kind of semiconductor called 1N4773.
Function of this product has 9.1 VOLT NOMINAL ZENER VOLTAGE + 5%.
Manufacturers : Compensated Deuices Incorporated
Image and pinout :
Some of the text within the PDF file :
• 9.1 VOLT NOMINAL ZENER VOLTAGE + 5% • TEMPERATURE COMPENSATED ZENER REFERENCE DIODES • LOW CURRENT RANGE: 0.5 AND 1.0 mA • METALLURGICALLY BONDED • DOUBLE PLUG CONSTRUCTION 1N4765 thru 1N4774A MAXIMUM RATINGS Operating Temperature: -65°C to +175°C Storage Temperature: -65°C to +175°C DC Power Dissipation: 500mW @ +50°C Power Derating: 4 mW / °C above +50°C REVERSE LEAKAGE CURRENT lR = 10 µA @ 25°C & VR = 6 Vdc ELECTRICAL CHARACTERISTICS @ 25°C, unless otherwise specified. JEDEC TYPE NUMBER ZENER VOLTAGE vz @ I ZT (Note 3) VOLTS ZENER TEST CURRENT I ZT MAXIMUM DYNAMIC IMPEDANCE ZZT (Note 1) MAXIMUM VOLTAGE TEMPERATURE TEMPERATURE RANGE STABILITY ∆V ZT (Note 2) mV 68 141 34 70 14 28 6.8 14 3.4 7 68 141 34 70 14 28 6.8 14 3.4 7 °C 0 to + 75 -55 to +100 0 to [ ... ]