This part is a kind of semiconductor called 3N128.

Function of this product has MOSFET AMPLIFIER.

Manufacturers : Motorola

Image and pinout :

Some of the text within the PDF file :

MAXIMUM RATINGS Rating Drain-Source Voltage Drain-Gate Voltage Gate-Source Voltage Drain Current @Total Device Dissipation T/^ = 25°C Derate above 25°C Operating and Storage Junction Temperature Range Symbol vDs vDg vgs id Pd Tj, Tstg Value + 20 + 20 ±10 50 330 2.2 -65 to +175 Unit Vdc Vdc Vdc mAdc mW mW/°C °C 3N128 CASE 20-03, STYLE 7 TO-72 (TO-206AF) MOSFET AMPLIFIER N-CHANNEL DEPLETION ELECTRICAL CHARACTERISTICS (Ta = 25°C unless otherwise noted.) OFF CHARACTERISTICS Characteristic Gate-Source Breakdown Voltaged) (Iq = -10/nAdc, V DS = 0) Gate Reverse Current (VGS = -8.0Vdc,VDS = 0) (Vqs = "8.0 Vdc, VDS = 0, TA = 125°C) Gate Source Cutoff Voltage (Vqs = 15 Vdc, Id = 50 ,uAdc) ON CHARACTERISTICS Zero-Gate-Voltage Drain Current(2)

3N128 PDF Datasheet Download