This part is a kind of semiconductor called 150K120.

Function of this product has SILICON POWER DIODE.

Manufacturers : NAINA SEMICONDUCTOR

Image and pinout :

Some of the text within the PDF file :

45L/150K SILICON POWER DIODE DO - 8 FEATURES • Diffused Series • Available in Normal & Reverse Polarity • Industrial Grade • Available In Avalanche Characteristic ELECTRICAL SPECIFICATIONS IF V FM IFSM IFRM I2t Maximum Average Forward Current Te=1500C Maximum peak forward voltage drop @ Rated IF(AV) Maximum peak one cycle (non-rep) surge current 10 m sec Maximum peak repetitive surge current Maximum I2t rating (non-rep.) for 5 to 10 msec. 150A 1.4V 3570A 750A 64,000 A2 Sec NAINA THERMAL MECHANICAL SPECIFICATIONS θ JC Tj Tstg W Maximum thermal resistance Junction to case Operating Junction Temp. Storage temperature Mounting torque (Non-lubricated threads) Approx, weight 0.250C/W -650C to 1500C -650C to 2000C 2.0 M-kg min, 3.0 M-kg max 150 gms. ELECTRICAL [ ... ]

150K120 PDF Datasheet Download