This part is a kind of semiconductor called 1N4008S.

Function of this product has General Purpose Plastic Rectifiers.

Manufacturers : LRC

Image and pinout :

Some of the text within the PDF file :

1N4001S thru 1N4008S General Purpose Plastic Rectifiers Reverse Voltage 50 to 1200V Forward Current 1.0A Feature * Plastic package has Underwriters Laboratories Flammability Classification 94V-0 * Construction utilizes void-free molded plastic technique * Low reverse leakage * High forward surge capability * Diffused junction * High temperature soldering guaranteed: 260°C/10 seconds * 0.375" (9.5mm) lead length, 5 lbs. (2.3kg) tension Mechanical Data Case: JEDEC A - 405, molded plastic body Terminals: Plated axial leads, solderable per MIL-STD-750, Method 2026 Polarity: Color band denotes cathode end Mounting Position: Any Weight: 0.0084 oz., 0.214 g Handling precaution:None 1.Maximum& Thermal Characteristics Ratings at 25°C ambient temperature unless otherwise specifi [ ... ]

1N4008S PDF Datasheet Download