2N4119A TO-72 4L

Jfets Overview

The 2N4119A is an N-channel Junction Field-Effect Transistor (JFET) designed for ultra-high input impedance applications in mid-to-high frequency circuits. It operates in depletion mode with a gate-to-source breakdown voltage of at least -40V and a drain-to-source saturation current minimum of 0.2 mA. The device features a gate-to-source cutoff voltage of -2V and a forward transconductance of 100 µS. Typical gate leakage is 1 pA at room temperature, ensuring minimal signal loading. The component is available in hermetically sealed TO-72 packages suitable for military environments.

Jfets Feature Summary

• Ultra-high input impedance characteristics ideal for precision analog front ends
• Hermetically sealed metal package construction suitable for harsh environments
• Low gate leakage current ensures high signal integrity in sensitive circuits

Jfets Applications

• High-impedance amplifier stages
• Precision analog switches
• Sample-and-hold circuits
• Military-grade instrumentation

Jfets Procurement Notes

Verify the specific ordering suffix to confirm the package type and binning options. The standard through-hole version utilizes the TO-72 case, while surface-mount variants use SMP packages. Confirm whether the required unit is the standard 2N4119 or the enhanced 'A' variant with specified electrical limits. Check for tape and reel availability if automated assembly is planned.

Jfets Selection Notes

Select the 2N4119A when a higher drain saturation current than the 2N4117 or 2N4118 is required. The -2V cutoff voltage makes it suitable for slightly higher bias voltages compared to lower-current counterparts. Ensure the application requires the specific transconductance range of 100 µS. Verify that the TO-72 hermetic seal meets the environmental requirements of the final system design.

Jfets Part Context

This component belongs to the Interfet 2N4117/4118/4119 family of N-channel JFETs. These devices are engineered specifically for applications demanding extremely low input currents. The 'A' designation typically indicates tighter electrical parameter specifications compared to the base part number. They serve as critical active elements in high-fidelity audio and scientific measurement equipment.

Jfets Replacement Considerations

Direct substitutes include the 2N4117/A and 2N4118/A, though these offer lower saturation currents. PN4119A and SMP4119A are equivalent part numbers representing different packaging formats. Verify pinout compatibility between TO-72 and SOT-23 packages before substitution.