This part is a kind of semiconductor called BF256A.

Function of this product has N-Channel RF Amplifiers.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

BF256A/BF256B/BF256C BF256A/BF256B/BF256C N-Channel RF Amplifiers • This device is designed for VHF/UHF amplifiers. • Sourced from process 50. 1 TO-92 1. Gate 2. Source 3. Drain Absolute Maximum Ratings Ta=25°C unless otherwise noted Symbol VDG VGS IGF PD TSTG Parameter Drain-Gate Voltage Gate-Source Voltage Forward Gate Current Total Device Dissipation @TA=25°C Derate above 25°C Operating and storage Temperature Range Value 30 -30 10 350 2.8 - 55 ~ 150 Units V V mA mW mW/°C °C Electrical Characteristics Ta=25°C unless otherwise noted Symbol Parameter Test Condition VDS = 0, IG = 1µA VDS = 15V, ID = 200µA VDS = 15V, ID = 10nA VGS = -20V, VGS = 0 Min. -30 -0.5 -0.5 -7.5 -8 -5 Max. Units V V V nA Off Characteristics V(BR)GSS Gate-Source Breakdown Voltage VGS VGS(off) IGSS G [ ... ]

BF256A PDF Datasheet Download