2N4118A-2

Jfets Overview

The Vishay Siliconix 2N4118A-2 is an N-channel JFET from the 2N/PN/SST4117A series, designed for ultra-high input impedance applications. It features a gate leakage current typically operating at 0.2 pA and specified with a 1-pA limit. Key electrical parameters include a Gate-Source Breakdown Voltage (V(BR)GSS) minimum of -40 V, a Gate-Source Cutoff Voltage (VGS(off)) range of -1 to -3 V, and a Saturation Drain Current (IDSS) minimum of 80 µA. The device offers a minimum forward transconductance (gfs) of 80 µS.

Jfets Feature Summary

• Ultra-low gate leakage current enabling high-impedance front-end amplifiers
• Hermetically sealed TO-206AF package suitable for military processing per MIL-S-19500
• Ultrahigh input impedance with insignificant signal loss or error voltage when used with high-impedance sources

Jfets Applications

• High-impedance transducer amplifiers
• Smoke detector inputs
• Infrared detector amplifiers
• Precision test equipment

Jfets Procurement Notes

Verify the specific suffix '-2' against the official datasheet, as standard listings typically reference '2N4118A'. Confirm package type availability, as the series supports TO-206AF, TO-226A, and TO-236 packages. Ensure compliance with RoHS directives if required, noting that some variants may not be compliant. Check for end-of-life status or discontinuance notices prior to procurement.

Jfets Selection Notes

Select this component for circuits requiring minimal input bias current and low noise characteristics. The -1 to -3 V cutoff voltage range allows for flexible biasing in mid-to-high frequency designs. Consider the hermetic TO-206AF package for harsh environments or the plastic TO-226A for cost-sensitive applications. Verify thermal derating requirements based on the chosen package style.

Jfets Part Context

This part belongs to the 2N/PN/SST4117A series of N-channel JFETs manufactured by Vishay Siliconix. The series targets ultra-high input impedance applications, offering options in through-hole and surface-mount packages. The 2N prefix denotes the hermetically sealed metal can variant, while PN and SST prefixes indicate plastic and surface-mount versions respectively.

Jfets Replacement Considerations

Cross-reference with other N-channel JFETs having similar VGS(off) ranges (-1 to -3 V) and IDSS specifications (min 80 µA). Verify pinout compatibility and package dimensions if substituting with non-series components. Ensure equivalent breakdown voltage and leakage current ratings are met.