This part is a kind of semiconductor called AM1214-200.

Function of this product has L-BAND RADAR APPLICATIONS RF & MICROWAVE TRANSISTORS.

Manufacturers : STMicroelectronics

Image and pinout :

Some of the text within the PDF file :

AM1214-200 RF & MICROWAVE TRANSISTORS L-BAND RADAR APPLICATIONS . . . . . . . PRELIMINARY DATA REFRACTORY/GOLD METALLIZATION EMITTER SITE BALLASTED LOW THERMAL RESISTANCE INPUT/OUTPUT MATCHING OVERLAY GEOMETRY METAL/CERAMIC HERMETIC PACKAGE P OUT = 200 W MIN. WITH 7.0 dB GAIN .400 x .500 2LFL (M205) hermetically sealed ORDER CODE BRANDING 1214-200 AM1214-200 PIN CONNECTION DESCRIPTION The AM1214-200 device is a high power Class C transistor specifically designed for L-Band Radar pulsed output and driver applications. This device is capable of operation over a wide range of pulse widths, duty cycles and temperatures, and wiil tolerate severe mismatch and overdrive conditions. Low RF thermal resistance and computerized automatic wire bonding techniques ensure high reliability and produc [ ... ]

AM1214-200 PDF Datasheet Download