SMP4340TR

Overview

The SMP4340TR is a surface-mount N-channel JFET from InterFET, packaged in SOT-23 and supplied on a 7-inch tape and reel. It features an InterFET N0016H geometry with a gate-to-source breakdown voltage of -50V. The device exhibits low gate leakage (<1pA typical at 40V) and low input capacitance (Ciss: 3pF typical). Electrical characteristics include a forward transconductance (Gfs) ranging from 1300 to 3000 μS and a drain-to-source saturation current (Idss) between 1.2mA and 3.6mA.

Feature Summary

• Utilizes proprietary InterFET N0016H geometry for exceptionally high radiation tolerance.
• Provides ultra-low gate leakage performance, typically less than 1pA at room temperature.
• Delivers mid-frequency gain with typical noise figures of 3.5 nV/√Hz.
• Features interchangeable source and drain pins within the SOT-23 package.

Applications

• Sensitive amplifier stages for mid-frequency designs
• Radar and satellite communications systems
• Medical imaging systems and ultrasound equipment
• Hydrophone preamplifiers

Procurement Notes

Verify that the specific order suffix matches the required packaging format. The TR designation indicates a 7-inch tape and reel configuration with a maximum quantity of 3,000 pieces per reel. Confirm compliance requirements such as RoHS and REACH status directly with the manufacturer documentation before finalizing procurement specifications.

Selection Notes

Select this component when designing circuits requiring high radiation tolerance and minimal gate leakage currents. The SMP4340TR serves as a direct surface-mount alternative to through-hole variants like the 2N4340. Ensure the design accommodates the specified Vgs(off) range and Idss limits to maintain proper biasing conditions for sensitive amplifier applications.

Part Context

This part belongs to the InterFET 2N4340/2N4341 family of N-channel JFETs. The SMP4340 variant specifically denotes the surface-mount SOT-23 package version, while the base 2N4340 refers to the TO-18 through-hole metal can package. Both share identical electrical characteristics but differ in physical form factor and mounting style.

Replacement Considerations

Cross-reference with industry standard parts including 2SK40, 2SK105, SST202, 2N4868A, 2N4869A, 2N4221A, J231, J202, and VCR4N. Verify pinout compatibility and electrical parameter margins against these equivalents before implementation.

FAQ

Are the source and drain pins interchangeable?

Yes, the S/D pins are interchangeable, allowing flexible orientation during PCB layout.

What is the typical gate leakage current?

Gate leakage is typically less than 1pA at room temperature.

Does this component offer radiation resistance?

Yes, the proprietary InterFET process yields exceptionally high radiation tolerance suitable for aerospace and military applications.