This part is a kind of semiconductor called MSA-0311.
Function of this product has Cascadable Silicon Bipolar MMIC Amplifier.
Manufacturers : Hewlett-Packard
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Some of the text within the PDF file :
Cascadable Silicon Bipolar MMIC Amplifier Technical Data MSA-0311 Features • Cascadable 50 Ω Gain Block • 3 dB Bandwidth: DC to 2.3 GHz • 11.0 dB Typical Gain at 1.0 GHz • 9.0 dBm Typical P1 dB at --1.0 GHz • Unconditionally Stable (k>1) • Low Cost Surface Mount Plastic Package • Tape-and-Reel Packaging Option Available[1] Note: 1. Refer to PACKAGING section “Tapeand-Reel Packaging for Semiconductor Devices”. Description The MSA-0311 is a low cost silicon bipolar Monolithic Microwave Integrated Circuit (MMIC) housed in the surface mount plastic SOT-143 package. This MMIC is designed for use as a general purpose 50 Ω gain block. Typical applications include narrow and broad band IF and RF amplifiers in commercial and industrial applications. The MSA-series is fabrica [ ... ]