This part is a kind of semiconductor called 1N4733.

Function of this product has SILICON PLANAR POWER ZENER DIODES.

Manufacturers : GOOD-ARK Electronics

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Some of the text within the PDF file :

1N4728 THRU 1N4764 SILICON PLANAR POWER ZENER DIODES Features Silicon Planar Power Zener Diodes for use in stabilizing and clipping circuits with high power rating. Standard Zener voltage tolerance is 10%. Add suffix “A” for 5% tolerance. Other tolerances available upon request. DIM ENSIONS DIM A B C D inches Min. 1.102 Max. 0.169 0.110 0.031 Min. 28.0 mm Max. 4.3 2.8 0.8 Note Absolute Maximum Ratings (Ta=25 ) Symbols Values Units Zener current see Table "Characteristics" Power dissipation at Tamb=25 Junction temperature Storage temperature range Ptot Tj TS 1 1) W 200 -65 to +200 Note: (1) Valid provided that leads at a distance of 8 mm from case are kept at ambient temperature. Characteristics Thermal resistance junction to ambient Air at Tamb=25 Symbols Min. Typ. Max. Units [ ... ]

1N4733 PDF Datasheet Download