This part is a kind of semiconductor called BFU530.

Function of this product has NPN wideband silicon RF transistor.

Manufacturers : NXP

Image and pinout :

Some of the text within the PDF file :

627% BFU530 NPN wideband silicon RF transistor Rev. 1 5 March 2014 Product data sheet 1. Product profile 1.1 General description NPN silicon RF transistor for high speed, low noise applications in a plastic, 4-pin dual-emitter SOT143B package. The BFU530 is part of the BFU5 family of transistors, suitable for small signal to medium power applications up to 2 GHz. 1.2 Features and benefits  Low noise, high breakdown RF transistor  AEC-Q101 qualified  Minimum noise figure (NFmin) = 0.7 dB at 900 MHz  Maximum stable gain 21.5 dB at 900 MHz  11 GHz fT silicon technology 1.3 Applications  Applications requiring high supply voltages and high breakdown voltages  Broadband amplifiers up to 2 GHz  Low noise amplifiers for ISM applications  ISM band oscillators [ ... ]

BFU530 PDF Datasheet Download