This part is a kind of semiconductor called 2N6166.

Function of this product has NPN SILICON RF POWER TRANSISTOR.

Manufacturers : Advanced Semiconductor

Image and pinout :

Some of the text within the PDF file :

2N6166 NPN SILICON RF POWER TRANSISTOR DESCRIPTION: The ASI 2N6166 is Designed to operate in a collector modulated VHF Power Amplifier Applications up to 200 MHz. PACKAGE STYLE .500 4L FLG .112x45° A FULL R L E C Ø.125 NOM. FEATURES: • ηC = 60 % min. @ 100 W/150 MHz • PG = 6.0 dB min. @ 100 W/150 MHz • Omnigold™ Metalization System C B B E H D G F E I J K MAXIMUM RATINGS IC VCBO VEBO PDISS TJ TSTG θJC 9.0 A 65 V 4.0 V 117 W @ TC = 25 °C -65 °C to +200 °C -65 °C to +150 °C 1.5 °C/W DIM A B C D E F G H I J K L MINIMUM inches / mm MAXIMUM inches / mm .220 / 5.59 .125 / 3.18 .245 / 6.22 .720 / 18.28 .125 / 3.18 .970 / 24.64 .495 / 12.57 .003 / 0.08 .090 / 2.29 .150 / 3.81 .980 / 24.89 .230 / 5.84 .255 / 6.48 .7.30 / 18.54 .980 / 24.89 .505 / 12.83 .007 / 0.18 [ ... ]

2N6166 PDF Datasheet Download