This part is a kind of semiconductor called 1A1.
Function of this product has SILICON RECTIFIER.
Manufacturers : Rectron Semiconductor
Image and pinout :
Some of the text within the PDF file :
RECTRON SEMICONDUCTOR TECHNICAL SPECIFICATION 1A1 THRU 1A7 SILICON RECTIFIER VOLTAGE RANGE 50 to 1000 Volts CURRENT 1.0 Ampere FEATURES * * * * High reliability Low leakage Low forward voltage drop High current capability R-1 MECHANICAL DATA * * * * * Case: Molded plastic black body Epoxy: UL 94V-O rate flame retardant Lead: MIL-STD-202E method 208C guaranteed Mounting position: Any Weight: 0.19 gram MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25 o C ambient temperature unless otherwise specified. Single phase, half wave, 60 Hz, resistive or inductive load. For capacitive load, derate current by 20%. Dimensions in inches and (millimeters) MAXIMUM RATINGS (At T A = 25 oC unless otherwise noted) RATINGS Maximum Recurrent Peak Reverse Voltage Maximum RMS Voltage Maximum DC [ ... ]