This part is a kind of semiconductor called PR1007.

Function of this product has FAST RECOVERY RECTIFIERS.

Manufacturers : Compact Technology

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Some of the text within the PDF file :

FAST RECOVERY RECTIFIERS FEATURES Fast switching for high efficiency Low cost Diffused junction Low reverse leakage current Low forward voltage drop High current capability The plastic material carries UL recognition 94V-0 MECHANICAL DATA Case : JEDEC DO-41 molded plastic Polarity : Color band denotes cathode Weight : 0.012 ounces, 0.34 grams Mounting position : Any PR1001 thru PR1007 REVERSE VOLTAGE - 50 to 1000 Volts FORWARD CURRENT - 1.0 Amperes DO-41 A BA D C DO-41 Dim. Min. Max. A 25.4 B 4.20 5.20 C 0.70 0.90 D 2.00 2.70 All Dimensions in millimeter MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25̺ ambient temperature unless otherwise specified. Single phase, half wave, 60Hz, resistive or inductive load. For capacitive load, derate current by 20% CHARACTERISTICS SY [ ... ]

PR1007 PDF Datasheet Download