This part is a kind of semiconductor called MAATSS0018.

Function of this product has Digital Attenuator.

Manufacturers : Tyco Electronics

Image and pinout :

Some of the text within the PDF file :

RoHS Compliant MAATSS0018 V2 Functional Block Diagram Digital Attenuator, 1-Bit, 10 dB Step DC - 2.0 GHz Features • • • • • • • Single 10 dB Step Low Loss: 0.3 dB @ 900 MHz Lead-Free SOT-25 Package 100% Matte Tin Plating over Copper Halogen-Free “Green” Mold Compound 260°C Reflow Compatible RoHS* Compliant Version of AT-266 Description M/A-COM’s MAATSS0018 is a 1 bit, 10 dB step GaAs MMIC digital attenuator in a lead-free SOT-25 surface mount plastic package. The MAATSS0018 is ideally suited for use where high accuracy, very low power consumption and low intermodulation products are required. Typical applications include radio, wireless LANs, GPS equipment and other gain/level control circuits. The MAATSS0018 is a GaAs MMIC using a mature 1-micro [ ... ]

MAATSS0018 PDF Datasheet Download