This part is a kind of semiconductor called 1N4934.

Function of this product has 1.0A FAST RECOVERY RECTIFIER.

Manufacturers : Diodes Incorporated

Image and pinout :

Some of the text within the PDF file :

1N4933/L - 1N4937/L 1.0A FAST RECOVERY RECTIFIER Features · · · · · · Diffused Junction Fast Switching for High Efficiency High Current Capability and Low Forward Voltage Drop Surge Overload Rating to 30A Peak Low Reverse Leakage Current Plastic Material: UL Flammability Classification Rating 94V-0 A B A D C Mechanical Data · · · · · · · Case: Molded Plastic Terminals: Plated Leads Solderable per MIL-STD-202, Method 208 Polarity: Cathode Band Weight: DO-41 0.35 grams (approx) A-405 0.20 grams (approx) Mounting Position: Any Marking: Type Number Dim A B C D DO-41 Plastic Min 25.40 4.06 0.71 2.00 Max ¾ 5.21 0.864 2.72 A-405 Min 25.40 4.10 0.53 2.00 Max ¾¾ 5.20 0.64 2.70 All Dimensions in mm “L” Suffix Designates A-405 Package No Suffix Designates DO-41 Package @ T [ ... ]

1N4934 PDF Datasheet Download