This part is a kind of semiconductor called 2N4091.

Function of this product has N-CHANNEL J-FET Qualified per MIL-PRF-19500/431.

Manufacturers : Microsemi Corporation

Image and pinout :

Some of the text within the PDF file :

TECHNICAL DATA N-CHANNEL J-FET Qualified per MIL-PRF-19500/431 Devices 2N4091 2N4092 2N4093 Qualified Level JANTX JANTXV ABSOLUTE MAXIMUM RATINGS (TA = +250C unless otherwise noted) Parameters / Test Conditions Symbol Value Gate-Source Voltage Drain-Source Voltage Drain-Gate Voltage Gate Current Power Dissipation (1) TA = +250C Operating Junction Operating Storage Temperature Range (1) Derate linearly 2.4 mW/0C for TA > 250C. VGS VDS VDG IG PT Tj Tstg -40 40 40 10 0.36 -65 to +175 -65 to +200 Units V V V mAdc W 0 C 0 C TO-18* (TO-206AA) *See appendix A for package outline ELECTRICAL CHARACTERISTICS (TC = +250C unless otherwise noted) PARAMETERS / TEST CONDITIONS Symbol Gate-Source Breakdown Voltage VDS = 0, IG = -1.0 µAdc Gate Reverse Current VDS = 0, VGS = -20 Vdc Drain Current VGS = [ ... ]

2N4091 PDF Datasheet Download