This part is a kind of semiconductor called HER208.

Function of this product has HIGH EFFICIENCY RECTIFIER.

Manufacturers : GOOD-ARK Electronics

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Some of the text within the PDF file :

HER201 THRU HER208 HIGH EFFICIENCY RECTIFIER Reverse Voltage - 50 to 1000 Volts Forward Current - 2.0 Amperes Features Low power loss, high efficiency Low leakage Low forward voltage drop High current capability High speed switching High current surge High reliability Mechanical Data Case: Molded plastic Epoxy: UL94V-0 rate flame retardant Lead: MIL-STD-202E method 208C guaranteed Mounting Position: Any Weight: 0.014 ounce, 0.39 gram DIM ENSIONS DIM A B C D inches Min. 0.228 0.102 0.028 1.000 Max. 0.299 0.142 0.034 Min. 5.8 2.6 0.71 25.40 mm Max. 7.6 3.6 0.86 Note Maximum Ratings and Electrical Characteristics Ratings at 25 ambient temperature unless otherwise specified. Single phase, half wave, 60Hz, resistive or inductive load. For capacitive load, derate current by 20%. Symbols HER [ ... ]

HER208 PDF Datasheet Download