This part is a kind of semiconductor called MRF148A.

Function of this product has N-CHANNEL MOS LINEAR RF POWER FET.

Manufacturers : Tyco Electronics

Image and pinout :

Some of the text within the PDF file :

SEMICONDUCTOR TECHNICAL DATA Order this document by MRF148/D The RF MOSFET Line RF Power Field-Effect Transistor N–Channel Enhancement–Mode Designed for power amplifier applications in industrial, commercial and amateur radio equipment to 175 MHz. • Superior High Order IMD • Specified 50 Volts, 30 MHz Characteristics Output Power = 30 Watts Power Gain = 18 dB (Typ) Efficiency = 40% (Typ) • IMD(d3) (30 W PEP) – 35 dB (Typ) • IMD(d11) (30 W PEP) – 60 dB (Typ) • 100% Tested For Load Mismatch At All Phase Angles With 30:1 VSWR • Lower Reverse Transfer Capacitance (3.0 pF Typical) D MRF148A 30 W, to 175 MHz N–CHANNEL MOS LINEAR RF POWER FET G S CASE 211–07, STYLE 2 MAXIMUM RATINGS Rating Drain–Source Voltage Drain–Gate Voltage Gate [ ... ]

MRF148A PDF Datasheet Download