This part is a kind of semiconductor called 1R5GU41.

Function of this product has ULTRAFAST EFFICIENT GLASS PASSIVATED RECTIFIER.

Manufacturers : Gulf Semiconductor

Image and pinout :

Some of the text within the PDF file :

1R5GU41 ULTRAFAST EFFICIENT GLASS PASSIVATED RECTIFIER VOLTAGE：400V CURRENT：1.5A FEATURE Low power loss Ultra-fast recovery time for high efficiency High temperature soldering guaranteed 250℃/10sec/0.375″lead length at 5 lbs tension MECHANICAL DATA Terminal：Plated axial leads solderable per MIL-STD 202E, method 208C Case：Molded with UL-94 Class V-0 recognized Flame Retardant Epoxy Polarity：color band denotes cathode Mounting position：any DO-15DO-204AC Dimensions in inches and (millimeters) MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS (single-phase, half -wave, 60HZ, resistive or inductive load rating at 25℃, unless otherwise stated) SYMBOL Maximum Recurrent Peak Reverse Voltage Vrrm Maximum RMS Voltage Vrms Maximum DC blocking Voltage Vdc Maximum Averag [ ... ]

1R5GU41 PDF Datasheet Download