This part is a kind of semiconductor called 1N4568.

Function of this product has 6.4 VOLT NOMINAL ZENER VOLTAGE + 5%.

Manufacturers : Compensated Deuices Incorporated

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Some of the text within the PDF file :

• 1N4565A-1 THRU 1N4584A-1 AVAILABLE IN JAN, JANTX, JANTXV AND JANS PER MIL-PRF-19500/452 • 6.4 VOLT NOMINAL ZENER VOLTAGE + 5% • TEMPERATURE COMPENSATED ZENER REFERENCE DIODES • METALLURGICALLY BONDED 1N4565 thru 1N4584A and 1N4565A-1 thru 1N4584A-1 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 = 2µA @ 25°C & VR = 3Vdc ELECTRICAL CHARACTERISTICS @ 25°C, unless otherwise specified. JEDEC TYPE NUMBER ZENER TEST CURRENT EFFECTIVE TEMPERATURE COEFFICIENT VOLTAGE TEMPERATURE STABILITY ( ∆ VZT MAX) (Note 1) mV 48 100 24 50 10 20 5 10 2.5 5 48 100 24 50 10 20 5 10 2.5 5 48 100 24 50 10 20 5 10 2.5 5 48 100 24 50 10 20 5 10 2.5 [ ... ]

1N4568 PDF Datasheet Download