This part is a kind of semiconductor called BT331.

Function of this product has 700-2700 MHz / 1.5 ~ 2.0W Power Amplifier.

Manufacturers : BeRex

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Some of the text within the PDF file :

BT331 700-2700 MHz 1.5~2.0W Power Amplifier Device Features       OIP3 = 51.0 dBm @ 1900 MHz Gain = 19.5 dB @ 900 MHz Output P1 dB = 33.3 dBm @ 1900 MHz 50 Ω Cascadable Highly Reliable InGaP/GaAs HBT Technology Lead-free/RoHS-compliant SOIC-8 SMT package Typical Performance1 Parameter 900 Gain S11 S22 OIP3 P1dB 2 YY = Year, WW = Work week, XX = Wafer Number Preliminary Datasheet Product Description BeRex’s BT331 is a high power and a high dynamic range amplifier in a low cost surface mount package(SOIC-8) with a RoHScompliant, that incorporates reliable heterojunction-bipolar-transistor (HBT) devices fabricated with InGaP GaAs technology. This device is designed for use where high linearity is required and features high OIP3 and Power with low consumption current [ ... ]

BT331 PDF Datasheet Download