This part is a kind of semiconductor called MRF901.

Function of this product has NPN Silicon High-Frequency Transistor.

Manufacturers : Motorola

Image and pinout :

Some of the text within the PDF file :

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MMBR901LT1/D The RF Line NPN Silicon High-Frequency Transistor Designed primarily for use in high–gain, low–noise small–signal amplifiers for operation up to 2.5 GHz. Also usable in applications requiring fast switching times. • High Current–Gain Bandwidth Product • Low Noise Figure @ f = 1.0 GHz NF(matched) = 1.8 dB (Typ) (MRF9011LT1) NF(matched) = 1.9 dB (Typ) (MMBR901LT1, T3) • High Power Gain Gpe(matched) = 13.5 dB (Typ) @ f = 1.0 GHz (MRF9011LT1) Gpe(matched) = 12.0 dB (Typ) @ f = 1.0 GHz (MMBR901LT1, T3) • Guaranteed RF Parameters (MRF9011LT1) • Surface Mounted SOT–23 & SOT–143 Offer Improved RF Performance Lower Package Parasitics High Gain • Available in tape and reel packaging option [ ... ]

MRF901 PDF Datasheet Download