This part is a kind of semiconductor called TGS2351-SM.

Function of this product has DC - 6 GHz High Power GaN SPDT Switch.

Manufacturers : TriQuint Semiconductor

Image and pinout :

Some of the text within the PDF file :

TGS2351-SM DC – 6 GHz High Power SPDT Switch Applications • High Power Switching QFN 4x4mm 24L Product Features • • • • • • • Frequency Range: DC – 6 GHz Power Handling: up to 40 W Insertion Loss: < 1 dB Isolation: -40 dB typical Switching Speed: 50 ns Control Voltages: 0 V/-40 V Dimensions: 4.0 x 4.0 x 1.43 mm Functional Block Diagram Vc2 J1 RF In Vc1 8 3&4 23 10 & 11 20 & 21 J2 RF Out1 J3 RF Out2 General Description The TriQuint TGS2351-SM is a Single-Pole, DoubleThrow (SPDT) Packaged Switch. The TGS2351-SM operates from DC to 6 GHz and is designed using TriQuint’s 0.25um GaN on SiC production process. The TGS2351-SM typically provides up to 40 W input power handling at control voltages of 0/-40 V. This switch maintains low insertion loss < 1 dB, and high isol [ ... ]

TGS2351-SM PDF Datasheet Download