This part is a kind of semiconductor called 1N6328.

Function of this product has 500mW GLASS ZENER DIODES.

Manufacturers : Digitron Semiconductors

Image and pinout :

Some of the text within the PDF file :

DIGITRON SEMICONDUCTORS 1N6309 – 1N6355D 500 mW GLASS ZENER DIODES MAXIMUM RATINGS Rating Symbol Value Unit Junction and storage temperature range TJ, Tstg -65 to +175 °C Thermal resistance, junction to lead(1) 1N6309-1N6320 1N6321-1N6355 RӨJL 150 95.5 °C/W Thermal resistance, junction to ambient (2) RӨJA 240 °C/W Steady state power dissipation @ TL = 75°C PD 0.5 W Forward voltage @ 1.0A VF 1.4 V Solder temperature @ 10s TSP 260 °C Note 1: At 3/8” from body. Note 2: TA = +55°C before derating on printed circuit board, PCB = FR4 0.0625” 1 layer 1oz. Cu, horizontal, still air, pads = 0.092” diameter, strip = 0.030” x 1” long, axial lead length L ≤ 0.187”. RӨJA with a defined thermal resistance condition included is measured at IZ = as de [ ... ]

1N6328 PDF Datasheet Download