2N4117A TO-72 4L

Jfets Overview

The Linear Integrated Systems 2N4117A is an N-channel JFET amplifier housed in a hermetically sealed TO-72 four-lead package. It provides ultra-high input impedance with a gate reverse current (IGSS) limit of -1 pA at 25°C and typically operates at 0.2 pA. The device features a saturation drain current (IDSS) range of 0.03 mA to 0.60 mA and a gate-source cutoff voltage (VGS(off)) between -0.6 V and -1.8 V. Common-source forward transconductance (gfs) ranges from 70 µS to 450 µS. Absolute maximum ratings include a gate-source or gate-drain voltage of -40 V, total device dissipation of 300 mW, and an operating junction temperature range of -55°C to +150°C.

Jfets Feature Summary

• Ultra-high input impedance suitable for sensitive front-end amplifiers
• Hermetically sealed TO-72 package designed for military applications
• Low power consumption with minimal circuit loading
• Direct replacement for discontinued Siliconix 2N4117A

Jfets Applications

• High-impedance sensitive front-end amplifiers
• Mid to high frequency designs requiring low leakage
• Military applications utilizing hermetic sealing

Jfets Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm the exact package type and binning options. Ensure that the requested revision matches the required electrical characteristics, particularly regarding gate leakage limits and breakdown voltages. Confirm availability through authorized distributors as this component may be subject to long-term supply constraints due to its specialized nature.

Jfets Selection Notes

Select the 2N4117A when ultra-low gate leakage currents are critical for signal integrity in high-impedance circuits. Compare IDSS and VGS(off) specifications against circuit requirements to ensure proper biasing. Consider the TO-72 package for environments requiring hermetic sealing, while evaluating SST or PN series variants if surface-mount or standard plastic packages are preferred for cost or assembly reasons.

Jfets Part Context

The 2N4117A belongs to a family of N-channel JFETs produced by Linear Integrated Systems, which includes the 2N4118A and 2N4119A variants. These devices share similar structural characteristics but differ in specific electrical parameters such as IDSS and VGS(off). The TO-72 package variant is distinct from the plastic TO-92 (PN) and SOT-23 (SST) versions, offering hermetic protection suitable for harsh environments.

Jfets Replacement Considerations

The datasheet identifies the 2N4117A as a direct replacement for the discontinued Siliconix 2N4117. Verify pinout compatibility and electrical parameter tolerances before substituting other JFETs. No other specific substitute part numbers are documented in the provided source material.