This part is a kind of semiconductor called SW-289.

Function of this product has GaAs DPDT Switch DC - 2 GHz.

Manufacturers : M/A-Com

Image and pinout :

Some of the text within the PDF file :

GaAs DPDT Switch DC - 2 GHz Features q q q q q q q q SW-289 V 2.00 SO-14 Very Low Power Consumption: 100 µW Low Insertion Loss: 0.5 dB High Isolation: 25 dB up to 2 GHz Very High Intercept Point: 48 dBm IP3 Nanosecond Switching Speed Temperature Range: -40˚C to +85˚C Low Cost SOIC14 Plastic Package Tape and Reel Packaging Available1 Description M/A-COM’s SW-289 is a GaAs MMIC DPDT switch in a low cost SOIC 14-lead surface mount plastic package. The SW-289 is ideally suited for use where very low power consumption is required. Typical applications include transmit/receive switching, switch matrices, digital step attenuators, and filter banks in systems such as: radio and cellular equipment, PCM, GPS, fiber optic modules, and other battery powered radio equipment. The SW-289 is fabr [ ... ]

SW-289 PDF Datasheet Download