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The J309 is a silicon N-channel Junction Field-Effect Transistor (JFET) designed for UHF band applications. It operates in depletion mode and utilizes a TO-92 cylindrical plastic package with three through-hole terminals. Key electrical characteristics include a minimum drain-source breakdown voltage of 25 V and a maximum feedback capacitance of 2.5 pF. The device supports a maximum operating temperature of 125 °C.
Verify the manufacturer designation, as the J309 part number has been associated with multiple vendors including Motorola/NXP and Fairchild. Confirm that the specific unit matches the required N-channel specification and TO-92 package style. Ensure compliance with RoHS standards if required by the application environment.
Select this component for circuits requiring low feedback capacitance in the UHF range. The TO-92 package limits power dissipation capabilities compared to surface-mount alternatives. Verify that the 25 V breakdown voltage meets the circuit's peak voltage requirements.
This component belongs to the family of small-signal RF transistors used in high-frequency analog circuits. It serves as a discrete active element for amplification or switching in radio frequency systems where low noise and fast response are critical.
Cross-reference with other N-channel JFETs in the TO-92 package. Verify pinout compatibility and electrical parameter overlap before substitution.