This part is a kind of semiconductor called BA159.

Function of this product has FAST SWITCHING PLASTIC RECTIFIER(VOLTAGE - 400 to 1000 Volts CURRENT - 1.0 Ampere).

Manufacturers : Pan Jit International Inc.

Image and pinout :

Some of the text within the PDF file :

BA157 THRU BA159 FAST SWITCHING PLASTIC RECTIFIER VOLTAGE - 400 to 1000 Volts CURRENT - 1.0 Ampere FEATURES l High surge current capability l Plastic package has Underwriters Laboratory Flammability Classification 94V-O Utilizing Flame Retardant Epoxy Molding Compound l Void-free Plastic in a DO-41 package l 1.0 ampere operation at TA=55 ¢J with no thermal runaway l l Fast switching for high efficiency Exceeds environmental standards of MIL-S-19500/228 DO-41 MECHANICAL DATA Case: Molded plastic, DO-41 Terminals: Axial leads, solderable per MIL-STD-202, Method 208 Polarity: Band denotes cathode Mounting Position: Any Weight: 0.012 ounce, 0.3 gram MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25 ¢J ambient temperature unless otherwise specified. Single phase, half wave, 60Hz, [ ... ]

BA159 PDF Datasheet Download