J310

Overview

The onsemi J310 is an N-channel depletion-mode Junction Field-Effect Transistor (JFET) designed for VHF and UHF applications. It operates with a maximum drain-source voltage of 25 V and a gate-source voltage of -25 V. The device supports a forward gate current of up to 10 mA and functions within a junction temperature range of -55°C to +150°C. Electrical characteristics include a typical zero-gate voltage drain current (IDSS) of 60 mA, a gate-source cutoff voltage between -1.0 V and -6.5 V, and a common-gate power gain of 16 dB at 100 MHz. The component is available in TO-92 and SOT-23 packages.

Feature Summary

• Designed specifically for VHF and UHF amplifier, oscillator, and mixer applications
• Capable of delivering high common-gate power gain in RF circuits
• Features interchangeable source and drain terminals for flexible PCB layout

Applications

• VHF/UHF amplifiers
• Oscillators
• Mixers

Procurement Notes

Verify the specific package variant required, as the J310 is manufactured in both TO-92 and SOT-23 form factors. Confirm that the sourcing channel provides documentation from Fairchild Semiconductor or its authorized successors, such as onsemi, to ensure compliance with original design specifications. Check for any lifecycle status updates regarding discontinuation or obsolescence before finalizing procurement plans.

Selection Notes

Select the J310 when designing circuits requiring an N-channel depletion-mode JFET for high-frequency signal processing. Ensure the application stays within the 25 V drain-source voltage limit and the 625 mW total device dissipation rating for the TO-92 package. Consider the interchangeable source and drain pins if board space or routing constraints are present. Verify that the noise figure and transconductance values meet the specific requirements of the intended RF stage.

Part Context

The J310 belongs to a family of N-channel RF amplifiers that includes the J309 and MMBFJ310 variants. These devices share similar electrical profiles but may differ in packaging or minor parameter tolerances. The datasheet indicates these components were originally developed by Fairchild Semiconductor and are now managed under the onsemi portfolio. They serve as standard discrete solutions for analog RF front-end designs.

Replacement Considerations

The J309 is a closely related part within the same family, offering similar RF performance characteristics. Designers should verify pinout compatibility and specific IDSS ranges when substituting between J309 and J310 models. Other potential replacements include the MMBFJ309 or MMBFJ310 for surface-mount implementations.