SMP4341

Overview

The InterFET SMP4341 is an N-channel Junction Field-Effect Transistor (JFET) utilizing proprietary N0016H geometry. It features a SOT-23 surface-mount package with a gate-to-source breakdown voltage of -50V and a drain-to-source saturation current range of 3mA to 9mA at VGS=0V. The device exhibits low input capacitance (Ciss) of 7pF typical, forward transconductance (GFS) between 2000μS and 4000μS, and high radiation tolerance. Maximum continuous power dissipation in the SOT-23 case is 350mW.

Feature Summary

• Utilizes InterFET N0016H geometry for exceptionally high radiation tolerance
• Features extremely low gate leakage current, typically less than 1pA at room temperature
• Provides low input capacitance suitable for sensitive mid-frequency amplifier stages
• Compliant with RoHS, REACH, and CMR standards

Applications

• Sensitive amplifier stages for mid-frequency designs
• Radar and satellite communications systems
• Missiles guidance and hydrophone preamplifiers
• Medical imaging systems and ultrasound equipment
• Electret microphone circuits and audio filters

Procurement Notes

Verify that the specific ordering suffix matches the required packaging format, such as bulk or tape and reel quantities. Confirm compliance requirements including RoHS and REACH status directly from the manufacturer's documentation. Ensure the selected variant aligns with the necessary thermal derating characteristics for the intended operating environment.

Selection Notes

Select the SMP4341 when low gate leakage and high radiation tolerance are critical design parameters. Compare the 7pF input capacitance against circuit bandwidth requirements. Evaluate the 350mW power dissipation limit against thermal management capabilities. Consider the SOT-23 footprint constraints during PCB layout planning.

Part Context

The SMP4341 belongs to the InterFET 2N4340/2N4341 family of N-channel JFETs. It shares electrical characteristics with the through-hole 2N4341 but utilizes a compact SOT-23 surface-mount package. This component serves as a direct replacement for industry standard parts like the 2SK40 and J202 in space-constrained applications requiring robust performance.

Replacement Considerations

Public confirmed substitutes include 2SK40, 2SK105, SST202, 2N4868A, 2N4869A, 2N4221A, J231, J202, and VCR4N. Verify pinout compatibility and electrical parameter overlaps before implementation.