IFN201ST3TR

Overview

The InterFET IFN201ST3TR is an N-channel JFET utilizing the InterFET N106A geometry, housed in a surface-mount SOT-23 package. It serves as a low-noise, high-radiation-tolerance component for cost-sensitive applications. Key electrical parameters include a gate-to-source breakdown voltage of -40V and a reverse gate current of -10pA at -20V. The gate-to-source cutoff voltage ranges from -0.5V to -1.0V for the IFN201A variant. Drain-to-source saturation current spans 0.2mA to 1mA depending on the specific bin. Forward transconductance is typically 500µS, with an input capacitance of 4pF and noise voltage of 3nV/√Hz.

Feature Summary

• Tightly screened IFN201A variant offers controlled VGS(OFF) between -0.5V and -1.0V
• Features extremely low gate leakage of 750fA typical at 20V
• Provides high radiation tolerance suitable for demanding environments
• Includes edge case SPICE modeling support via InterFET SPICE

Applications

• Audio tone control circuits and headphone amplifiers
• Radar and communication systems for military/aerospace use
• Medical imaging systems and ultrasound equipment
• Low leakage switches and signal mixers

Procurement Notes

Verify the IFN201ST3TR designation specifically indicates the 7-inch tape and reel packaging configuration containing up to 3,000 pieces per reel. Confirm that the required device matches the standard IFN201 specifications rather than the tightly screened IFN201A or IFN202 variants, as these share the same physical package but differ significantly in electrical screening criteria and performance bins.

Selection Notes

Select this component when designing audio preamplifiers or microphone impedance transformation circuits requiring low noise and minimal gate leakage. Ensure the design accommodates the interchangeable source/drain pins characteristic of the SOT-23 package. Consider the IFN201A variant if strict cutoff voltage screening between -0.5V and -1.0V is necessary for precise biasing requirements.

Part Context

This part belongs to the InterFET IFN201 family, which includes the IFN201, IFN201A, and IFN202 variants. These parts are designed as exact crosses for industry-standard JFETs such as SST201, MMBFJ201, J201, and J202. The family targets cost-sensitive low-noise applications while maintaining high radiation tolerance and offering custom test and binning options.

Replacement Considerations

Publicly documented direct cross-compatibility exists for SST201, MMBFJ201, J201, and J202. Similar InterFET parts include 2N4338, 2N4339, 2N4867, 2N4868, 2N4869, J201, J202, 2N3458, 2N3459, and 2N3460. Verify pinout compatibility, particularly regarding the interchangeable source/drain connections in the SOT-23 package.

FAQ

Are the source and drain pins interchangeable?

Yes, the S/D pins are interchangeable for Source/Drain connections in the SOT-23 package.

What is the maximum continuous forward gate current?

The maximum continuous forward gate current (IFG) is 50 mA.

Does the IFN201ST3TR support RoHS compliance?

Yes, the product is RoHS, REACH, and CMR compliant.