SMP4221

Overview

The InterFET SMP4221 is an N-channel JFET in a surface-mount SOT-23 package, designed for sensitive amplifier stages. It features a gate-to-source breakdown voltage of -30V and a typical drain-to-source saturation current of 2mA. The device exhibits low input capacitance (6pF) and high forward transconductance (2000μS). Operating junction temperature ranges from -55°C to 150°C with continuous power dissipation of 300mW.

Feature Summary

• Utilizes InterFET N0016H geometry for optimized performance
• Features extremely low gate leakage currents typically below 10pA at room temperature
• Provides high input impedance suitable for precision signal processing
• Offers surface-mount SOT-23 packaging alongside through-hole and bare die options

Applications

• Mixers
• Oscillators
• Small Signal Amplifiers
• VHF Amplifiers

Procurement Notes

Verify the specific suffix against official documentation to confirm binning or screening levels. Confirm that the SOT-23 package variant aligns with the required PCB footprint and thermal management constraints. Ensure compliance with RoHS standards if applicable to the end application environment.

Selection Notes

Select this component when low noise and high input impedance are critical for mid-frequency designs. Compare the 2N4221/A minimum transconductance against circuit requirements. Evaluate the SOT-23 package suitability for space-constrained layouts compared to TO-72 or TO-92 alternatives.

Part Context

This part belongs to the 2N4220/2N4221 family of N-channel JFETs. The 'A' variants are screened for lower noise characteristics. The series supports multiple mounting styles including Surface Mount Technology (SMT), Through-Hole (TH), and Bare Die configurations to accommodate diverse manufacturing needs.

Replacement Considerations

Direct substitutes include the SMP4220, SMP4220A, SMP4221A, and tape-and-reel versions SMP4221TR and SMP4221ATR. Verify pinout compatibility within the SOT-23 form factor before integration.