This part is a kind of semiconductor called FR107.

Function of this product has FAST RECOVERY RECTIFIER(VOLTAGE RANGE 50 to 1000 Volts CURRENT 1.0 Ampere).

Manufacturers : Rectron

Image and pinout :

Some of the text within the PDF file :

RECTRON SEMICONDUCTOR TECHNICAL SPECIFICATION FR101 THRU FR107 FAST RECOVERY RECTIFIER VOLTAGE RANGE 50 to 1000 Volts CURRENT 1.0 Ampere FEATURES * * * * * * Fast switching Low leakage Low forward voltage drop High current capability High surge capability High reliability DO-41 MECHANICAL DATA * * * * * Case: Molded plastic Epoxy: Device has UL flammability classification 94V-O Lead: MIL-STD-202E method 208C guaranteed Mounting position: Any Weight: 0.33 gram 1.0 (25.4) MIN. .034 (0.9) DIA. .028 (0.7) .205 (5.2) .166 (4.2) .107 (2.7) .080 (2.0) DIA. MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25 C ambient temperature unless otherwise specified. Single phase, half wave, 60 Hz, resistive or inductive load. For capacitive load, derate current by 20%. o 1.0 (25.4) MIN. [ ... ]

FR107 PDF Datasheet Download