bf1109 r wr.pdf datasheet:

DISCRETE SEMICONDUCTORS DATA SHEETBF1109; BF1109R; BF1109WRN-channel dual-gate MOS-FETsProduct specification 1997 Dec 08Supersedes data of 1997 Sep 03NXP Semiconductors Product specificationBF1109; BF1109R;N-channel dual-gate MOS-FETsBF1109WRFEATURES PINNING Short channel transistor with high PIN DESCRIPTIONhandbook, 2 columns 43forward transfer admittance to input 1 sourcecapacitance ratio2 drain Low noise gain controlled amplifier 3 gate 2up to 1 GHz2 14 gate 1 Internal self-biasing circuit to Top view MSB035ensure good cross-modulation performance during AGC and good DC stabilization. BF1109R marking code: NBp.Fig.2 Simplified outline APPLICATIONS(SOT143R). VHF and UHF applications with 9 V supply voltage, such as television tuners and professional communications equipment.handbook, 2 columns 34