This part is a kind of semiconductor called 1A3.

Function of this product has MINIATURE PLASTIC SILICON RECTIFIER(VOLTAGE - 50 to 1000 Volts CURRENT - 1.0 Ampere).

Manufacturers : Pan Jit International Inc.

Image and pinout :

Some of the text within the PDF file :

1A1 THRU 1A7 MINIATURE PLASTIC SILICON RECTIFIER VOLTAGE - 50 to 1000 Volts CURRENT - 1.0 Ampere FEATURES l High reliability l Low leakage l l l Low forward voltage drop High current capability Exceeds environmental standards of MIL-S-19500/228 R-1 MECHANICAL DATA Case: Molded plastic black body, R-1 Epoxy: UL 94V-O rate flame retardant Lead: MIL-STD-202E method 208C guaranteed Mounting Position: Any Weight: 0.0064 ounce, 0.181 gram MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25 ¢J ambient temperature unless otherwise specified. Single phase, half wave, 60 Hz, resistive or inductive load. For capacitive load, derate current by 20%. Maximum Recurrent Peak Reverse Voltage Maximum RMS Voltage Maximum DC Blocking Voltage Maximum Average Forward Rectified Current .375"(9.5mm) [ ... ]

1A3 PDF Datasheet Download