SST4091 SERIES N-Channel JFET The SST4091 Series is the surface mount equivalent of our popular 2N4091 device types. Its low cost and rOS(on) make it a good choice for an all-purpose analog switch, while its high gfs and good high-frequency response also make this product useful in a high-gain amplifier mode. Like all SOT-23 products available from Siliconix, tape and reel capabilities exist for automated assembly. (See Section 8.) For further design information please consult the typical perfor.