This part is a kind of semiconductor called DD250S.

Function of this product has (DD250/S - DD256/S) 25A GLASS PASSIVATED DISH TYPE PRESS-FIT DIODE.

Manufacturers : Won-Top Electronics

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Some of the text within the PDF file :

WTE POWER SEMICONDUCTORS DD250/S – DD256/S Pb 25A GLASS PASSIVATED DISH TYPE PRESS-FIT DIODE Features ! ! ! ! ! ! Glass Passivated Die Construction Low Leakage Low Cost High Surge Current Capability Low Forward C-Band Terminal Construction C Anode + D Mechanical Data B ! ! ! Case: 8.4mm or 9.5mm Dish Type Press-Fit with Silicon Rubber Sealed on Top Terminals: Contact Areas Readily Solderable Polarity: Cathode to Case (Reverse Units Are Available Upon Request and Are Designated By A “R” Suffix, i.e. DD250R or DD250SR) Polarity: White Color Equals Standard, Black Color Equals Reverse Polarity Mounting Position: Any Lead Free: For RoHS / Lead Free Version, Add “-LF” Suffix to Part Number, See Page 2 A 8.4mm Dish 9.5mm Dish Min Max Min Max 8.25 8.45 9.30 9. [ ... ]

DD250S PDF Datasheet Download