Linear Systems JFETs U309 TO-18 3L

The U309 is a single N-channel JFET amplifier designed for high-frequency applications, available in a TO-18 package. It has a maximum gate-to-source voltage of -25V, a continuous power dissipation of 500mW, and operates within a junction temperature range of -55°C to 150°C. The device exhibits a noise figure of 2.7dB at 450MHz and a power gain of 11.5dB at the same frequency. Its gate-to-source cutoff voltage ranges from -1V to -4V, with a drain-source saturation current of 12mA to 30mA at VDS=10V and VGS=0V. Input capacitance is 5pF at VDS=10V and VGS=-10V, and forward transconductance is 8mS at ID=10mA.