This part is a kind of semiconductor called BF1005R.

Function of this product has Silicon N-Channel MOSFET Tetrode.

Manufacturers : Infineon Technologies AG

Image and pinout :

Some of the text within the PDF file :

Silicon N-Channel MOSFET Tetrode • For low noise, high gain controlled input stages up to 1 GHz • Operating voltage 5V • Integrated biasing network • Pb-free (RoHS compliant) package1) • Qualified according AEC Q101 BF1005... AGC RF Input Drain RF Output G2 + DC G1 GND ESD (Electrostatic discharge) sensitive device, observe handling precaution! Type Package Pin Configuration BF1005 SOT143 1=S 2=D 3=G2 4=G1 - - BF1005R SOT143R 1=D 2=S 3=G1 4=G2 - - Marking MZs MZs Maximum Ratings Parameter Symbol Value Unit Drain-source voltage Continuous drain current Gate 1/ gate 2-source current Gate 1 (external biasing) Total power dissipation TS ≤ 76 °C Storage temperature Channel temperature VDS ID ±IG1/2SM +VG1SE Ptot Tstg Tch 8 25 10 3 200 -55 ... 150 150 V mA V [ ... ]

BF1005R PDF Datasheet Download