This part is a kind of semiconductor called 2N4861.

Function of this product has N-CHANNEL J-FET.

Manufacturers : Microsemi Corporation

Image and pinout :

Some of the text within the PDF file :

TECHNICAL DATA N-CHANNEL J-FET Qualified per MIL-PRF-19500/385 Devices 2N4856 2N4857 2N4858 2N4859 2N4860 2N4861 Qualified Level JAN JANTX JANTXV ABSOLUTE MAXIMUM RATINGS (TC = +250C unless otherwise noted) 2N4856 2N4859 Parameters / Test Conditions Symbol 2N4857 2N4860 2N4858 2N4861 Gate-Source Voltage VGS -40 -30 Drain-Source Voltage VDS 40 30 Drain-Gate Voltage VDG 40 30 Gate Current IG 50 Power Dissipation TA = +250C (1) PT 0.36 TC = +250C (2) 1.8 Operating Junction & Storage Temperature Range Tj, Tstg -65 to +200 (1) Derate linearly 2.06 mW/0C for TA > 250C. (2) Derate linearly 10.3 mW/0C for TC > 250C. ELECTRICAL CHARACTERISTICS (TC = 250C unless otherwise noted) Parameters / Test Conditions Symbol Gate-Source Breakdown Voltage V(BR)GSS VDS = 0, IG = 1.0 µAdc 2N4856, 2N4857, 2N4858 [ ... ]

2N4861 PDF Datasheet Download