SMP4391TR

Overview

The SMP4391TR is a surface-mount N-channel JFET from InterFET, utilizing the N0132S geometry in an SOT-23 package. It features a gate-to-source breakdown voltage of -40V and a drain-to-source saturation current (IDSS) ranging from 50mA to 150mA. The device exhibits low noise characteristics with a typical input of 1.2 nV/√Hz. Static on-resistance (RDS(ON)) ranges from 30Ω to 60Ω at 1kHz. Dynamic performance includes a turn-on delay of 15ns and rise time of 5ns. Gate leakage is typically under 50pA at room temperature.

Feature Summary

• Utilizes InterFET N0132S geometry for optimized performance
• Provides low noise operation suitable for sensitive signal paths
• Enables fast switching capabilities for high-speed applications
• Offers extremely low gate leakage currents at room temperature

Applications

• Low on-resistance analog switches
• Chopper circuits
• Commutator designs

Procurement Notes

Verify that the ordering suffix TR corresponds to the 7-inch tape and reel packaging configuration containing a maximum of 3,000 pieces per reel as specified in the official InterFET documentation. Confirm the specific binning requirements for IDSS and VGS(off) parameters if tight tolerances are necessary for the target application design.

Selection Notes

Select this component when low noise and fast switching are required in a compact surface-mount form factor. The SMP4391 variant provides higher saturation current compared to other members of the series, making it suitable for applications demanding lower on-resistance. Ensure the SOT-23 footprint aligns with the PCB layout constraints and thermal management requirements.

Part Context

This part belongs to the 2N4391-2-3 family of N-channel JFETs manufactured by InterFET. The series includes through-hole variants like the 2N4391 and PN4391, alongside bare die options. The SMP4391 specifically adapts the standard JFET characteristics for surface-mount technology, maintaining the electrical performance of its through-hole counterparts while enabling automated assembly processes.

Replacement Considerations

Direct functional equivalents within the same family include the SMP4392 and SMP4393, though they differ significantly in saturation current and cutoff voltage specifications. Cross-brand replacements require careful verification of pinout compatibility and electrical parameter alignment against the original design requirements.