This part is a kind of semiconductor called IN5399.

Function of this product has (IN5391 - IN5399) PLASTIC SILICON RECTIFIER.

Manufacturers : CHENG-YI

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Some of the text within the PDF file :

IN5391 thru IN5399 PLASTIC SILICON RECTIFIER CHENG- YI ELECTRONIC VOLTAGE RANGE 50 TO 1000 Volts CURRENT 1.5 Ampere DO-15 FEATURE Low forward voltage High current capability Low leakage current High surge capability Low cost MECHANICAL DATA Case:Molded plastic use UL 94V-0 recognized Flame retardant epoxy Terminals:Axial leads, solderable per MIL-STD-202, method 208 Polarity:Color band denotes cathode Mounting Position:Any MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 250C ambient temperature unless otherwise specified. Single phase, half wave, 60Hz, resistive or inductive load. For capacitive load, derate current by 20%. IN5391 IN5392 IN5393 IN5394 IN5395 IN5396 IN5397 IN5398 IN5399 UNITS V V V A A V A A pF S 0 Maximum Recurrent Peak Reverse Voltage Maximum RMS Voltage [ ... ]

IN5399 PDF Datasheet Download