This part is a kind of semiconductor called WS2803.

Function of this product has RF Switch.

Manufacturers : Wi-Sys

Image and pinout :

Some of the text within the PDF file :

Wi-Sys Communications Inc. WS2803 RF Switch Applications: ♦ L-Band / S-Band ♦ 802.11 WiFi / 2.4 GHz ISM ♦ Test & Measurement Equipment The WS2803 is a general-purpose, high performance, high isolation solid-state L-Band and S-Band RF coaxial switch. The high switching speed also allows for the user to send bursts of RF signal, making it suitable for testing RF detectors, power regulated amplifiers or any other devices operated under rapidly varying RF levels. Technical Specifications Electrical ♦ ♦ ♦ ♦ ♦ ♦ ♦ Voltage Supply: 4 to 15 VDC Frequency range: 100 MHz to 2.5 GHz Switch Speed: 100 ns typ. (600 ns max.) Impedance: 50 Ohms 1dB Compression point: 27 dBm @ 0.1 – 2GHz VSWR: 1.5 max (S11 and S22) IIp3: 44dBm @1900MHz ♦ Isolation: 50 dB Max. @ 0.1 to 2.5 GHz ♦ [ ... ]

WS2803 PDF Datasheet Download