This part is a kind of semiconductor called 1N5301.

Function of this product has CURRENT REGULATOR DIODES.

Manufacturers : Motorola Inc

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Current Regulator Diodes Field-effect current regulator diodes are circuit elements that provide a current essentially independent of voltage. These diodes are especially designed for maximum impedance over the operating range. These devices may be used in parallel to obtain higher currents. Manufacturing Locations: WAFER FAB: Phoenix, Arizona ASSEMBLY/TEST: Phoenix, Arizona 1N5283 through 1N5314 CURRENT REGULATOR DIODES CASE 51-02 MAXIMUM RATINGS Rating Peak Operating Voltage (TJ = –55°C to +200°C) Steady State Power Dissipation @ TL = 75°C Derate above TL = 75°C Lead Length = 3/8″ (Forward or Reverse Bias) Operating and Storage Junction Temperature Range Symbol POV PD 600 4.8 mW mW/°C Value 100 Unit Volts TJ, Tstg –55 to +200 °C [ ... ]

1N5301 PDF Datasheet Download