This part is a kind of semiconductor called 1N746.
Function of this product has ZENER DIODES.
Manufacturers : General Semiconductor
Image and pinout :
Some of the text within the PDF file :
NEW PRODUCT NEW PRODUCT NEW PRODUCT 1N746 THRU 1N759 ZENER DIODES FEATURES DO-35 ♦ Silicon Planar Power Zener Diodes ♦ Standard Zener voltage tolerance is ±5% for “A” suffix. Other tolerances are available upon request. min. 1.083 (27.5) max. .150 (3.8) max. ∅.079 (2.0) Cathode Mark min. 1.083 (27.5) max. ∅.020 (0.52) MECHANICAL DATA Case: DO-35 Glass Case Weight: approx. 0.13 g Dimensions are in inches and (millimeters) MAXIMUM RATINGS Ratings at 25°C ambient temperature unless otherwise specified. SYMBOL VALUE UNIT Zener Current (see Table “Characteristics”) Power Dissipation at TL = 75°C Maximum Junction Temperature Storage Temperature Range NOTES: Ptot Tj TS 500(1) 175 – 65 to +175 mW °C °C (1) TL is measured 3/8” from body. SYMBOL MIN. T [ ... ]