This part is a kind of semiconductor called ERF-2030.

Function of this product has RF Power Transistor.

Manufacturers : EKL Components

Image and pinout :

Some of the text within the PDF file :

NEW PRODUCT ANNOUNCEMENT SEPT. 2005 Introducing... “The new industry standard driver and final RF power transistor.” EKL ERF2 030 EKL Components’ ERF-2030 RF Power Transistor and EN-Prefix Companion Parts Everyone is in a panic! Last year, Mitsubishi discontinued the 3 most popular transistors in our industry - the 2SC2166, 2SC1969, and 2SC2312. These parts are already becoming scarce and prices are skyrocketing! The panic is over! The ERF-2030 is a versatile 25 watt* RF transistor that can replace ALL THREE discontinued Mitsubishi parts! ERF-2030 Features... 1) The ERF-2030 is a 25 watt* transistor - therefore, it is not just a replacement part, but also an UPGRADE to the old Mitsubishi parts. 0525 Example: EKL Components has a documented modification for turning a Galaxy 33 [ ... ]

ERF-2030 PDF Datasheet Download