This part is a kind of semiconductor called HER208.

Function of this product has 24 HIGH EFFICIENCY GPP DIODES.

Manufacturers : Leshan Radio Company

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Some of the text within the PDF file :

HER201 thru HER208 Feature High Efficiency Rectifiers Reverse Voltage 50 to 1000V Forward Current 2.0A * Plastic package has Underwriters Laboratory Flammability Classification 94V-0 * High temperature metallurgically bonded construction * Deffused junction * Capable of meeting environmental standards of MIL-S-19500 * 2.0 A operation at TA=55°C with no thermal runaway * For use in high frequency rectifier circuits * Fast switching for high efficiency * Typical IR less than 1.0µA * High temperature soldering guaranteed: 260°C/10 seconds * 0.375" (9.5mm) lead length, 5 lbs. (2.3kg) tension Mechanical Data Case: JEDEC DO-15, molded plastic body We declare that the material of product Terminals: Plated axial leads, solderable per compliance with ROHS requirements MIL-STD-750, Metho [ ... ]

HER208 PDF Datasheet Download