This part is a kind of semiconductor called BD13003B.

Function of this product has NPN Plastic Encapsulated Transistor.

Manufacturers : SeCoS

Image and pinout :

Some of the text within the PDF file :

BD13003B Elektronische Bauelemente 1.5A , 700V NPN Plastic Encapsulated Transistor RoHS Compliant Product A suffix of “-C” specifies halogen & lead-free FEATURES Power Switching Applications www.net TO-126 CLASSIFICATION OF ts Product-Rank Range Product-Rank Range BD3DD13003-A1 2-2.5 (µs) BD3DD13003-B1 3-3.5 (µs) BD3DD13003-A2 A 2.5-3 (µs) F E B BD3DD13003-B2 3.5-4 (µs) N L M K J H C D Collector G 2 REF. 1 Base 3 Emitter A B C D E F G Millimeter Min. Max. 7.40 7.80 2.50 2.90 10.60 11.00 15.30 15.70 3.70 3.90 3.90 4.10 2.29 TYP. REF. H J K L M N Millimeter Min. Max. 1.10 1.50 0.45 0.60 0.66 0.86 2.10 2.30 1.17 1.37 3.00 3.20 ABSOLUTE MAXIMUM RATINGS (TA = 25°C unless otherwise specified) Parameter Collector to Base Voltage Collector to Emitter Voltag [ ... ]

BD13003B PDF Datasheet Download