IFN160AST3

Overview

The IFN160AST3 is an N-channel JFET from the IFN160A series manufactured by InterFET, housed in a surface-mount SOT-23 package. It utilizes InterFET's N107A geometry to achieve low gate leakage of 3.0 pA typical at 20V and low input capacitance (CISS) of 4 pF typical. The device features a gate-to-source breakdown voltage (BVGSS) of -75 V minimum and a forward transconductance (GFS) of 1500 µS. Drain-to-source saturation current (IDSS) ranges from 0.5 mA to 1.5 mA for this specific binning. Designed for cost-sensitive low-noise applications, it serves as an exact cross for the 2SK160 JFET.

Feature Summary

• Utilizes InterFET N107A geometry for high radiation tolerance
• Features extremely low gate leakage of 3.0 pA typical at 20V
• Provides low input capacitance of 4 pF typical
• Includes edge case SPICE modeling support

Applications

• Audio tone control circuits and headphone amplifiers
• Microphone impedance transformation and drive stages
• Phono preamplifiers and audio filters
• Radar and communication systems
• Medical imaging systems and ultrasound equipment

Procurement Notes

Verify the specific ordering suffix to confirm packaging format. The 'ST3' suffix indicates bulk SOT-23 packaging, while 'TR' denotes tape and reel options with maximum quantities of 3,000 pieces for 7-inch reels or 9,000 pieces for 13-inch reels. Confirm compliance requirements such as RoHS, REACH, and CMR status directly with the manufacturer before finalizing procurement orders.

Selection Notes

Select the IFN160AST3 when a direct replacement for the 2SK160 JFET is required in low-noise designs. Ensure the application can accommodate the specified IDSS range of 0.5 mA to 1.5 mA and the GFS of 1500 µS. Verify that the SOT-23 package dimensions align with the PCB layout, noting that source and drain pins are interchangeable.

Part Context

The IFN160AST3 belongs to the IFN160A-B-C family of N-channel JFETs. This series includes variants like the IFN160BST3 and IFN160CST3, which share similar electrical characteristics but may differ in specific parameter bins. The component is part of InterFET's portfolio targeting cost-sensitive, high-performance analog applications requiring low noise and high impedance.

Replacement Considerations

The datasheet identifies the IFN160AST3 as an exact cross for the 2SK160 JFET. Other industry standard crosses include BF510, BF511, J305, and MMBFJ202. Similar InterFET parts include 2N4339, 2N4340, 2N4302, J202, and 2N5484. Verify pinout compatibility and parameter tolerances when substituting these alternatives.

FAQ

Are the source and drain pins interchangeable on the IFN160AST3?

Yes, the documentation explicitly states that the source and drain (S/D) pins are interchangeable.

What is the typical gate leakage current for this component?

The typical gate leakage current is 3.0 pA at 20V, with a maximum reverse current of 100 pA at VGS = -30V.

Does the IFN160AST3 support SPICE simulation?

Yes, InterFET provides edge case SPICE modeling for this component through their official resources.