This part is a kind of semiconductor called BF245B.

Function of this product has JFET VHF/UHF Amplifiers.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

ON Semiconductort JFET VHF/UHF Amplifiers N–Channel Depletion BF245A BF245B MAXIMUM RATINGS Rating Drain–Source Voltage Drain–Gate Voltage Gate–Source Voltage Drain Current Forward Gate Current Total Device Dissipation @ TA = 25°C Derate above 25°C Storage Channel Temperature Range 3 DRAIN Symbol VDS VDG VGS ID IG(f) PD Tstg Value ±30 30 30 100 10 350 2.8 –65 to +150 3 DRAIN Unit Vdc Vdc Vdc mAdc mAdc mW mW/°C °C 1 2 3 BF244A, BF244B CASE 29–11, STYLE 22 TO–92 (TO–226AA) 1 2 3 2 GATE STYLE 22 1 GATE STYLE 23 BF245, BF245A, BF245B, BF245C CASE 29–11, STYLE 23 TO–92 (TO–226AA) 2 SOURCE 1 SOURCE ELECTRICAL CHARACTERISTICS (TA = 25°C unless otherwise noted) Characteristic Symbol Min Typ Max Unit OFF CHARACTERISTICS Gate–Source B [ ... ]

BF245B PDF Datasheet Download