This part is a kind of semiconductor called 70N03.

Function of this product has N-channel Enhancement-mode MOSFET.

Manufacturers : General Semiconductor

Image and pinout :

Some of the text within the PDF file :

GFB70N03 N-Channel Enhancement-Mode MOSFET H C N T E TRE NF E G TO-263AB 0.380 (9.65) 0.420 (10.67) 0.21 (5.33) Min. D VDS 30V RDS(ON) 8mΩ ID 70A D ® G 0.160 (4.06) 0.190 (4.83) 0.045 (1.14) 0.055 (1.40) S 0.42 (10.66) 0.320 (8.13) 0.360 (9.14) G PIN D S 0.575 (14.60) 0.625 (15.88) 0.055 (1.39) 0.066 (1.68) Dimensions in inches and (millimeters) 0.63 (17.02) 0.33 (8.38) Seating Plate -T0.096 (2.43) 0.102 (2.59) 0.027 (0.686) 0.037 (0.940) 0.120 (3.05) 0.155 (3.94) 0.014 (0.35) 0.020 (0.51) 0.100 (2.54) 0.130 (3.30) 0.08 (2.032) 0.24 (6.096) 0.12 (3.05) Mounting Pad Layout Mechanical Data Case: JEDEC TO-263 molded plastic body Terminals: Leads solderable per MIL-STD-750, Method 2026 High temperature soldering guaranteed: 250°C/10 seconds at terminal [ ... ]

70N03 PDF Datasheet Download