SMP4221TR

Overview

The InterFET SMP4221TR is an N-Channel JFET in a surface-mount SOT23 package, part of the 2N4221/A series. It features a gate-to-source breakdown voltage (BV_GSS) of -30V and a drain-to-source saturation current (I_DSS) minimum of 2mA. The device exhibits a forward transconductance (G_FS) minimum of 2000μS and typical input capacitance (C_iss) of 3.5pF. Designed for mid-frequency applications, it offers low noise characteristics with a typical noise figure of 6nV/√Hz.

Feature Summary

• Utilizes InterFET N0016H geometry for optimized performance
• Provides high input impedance with typical gate leakage below 10pA
• Features low input capacitance for reduced signal loading
• Screened 'A' variants ensure lower noise specifications

Applications

• Mixers
• Oscillators
• Small Signal Amplifiers
• VHF Amplifiers

Procurement Notes

Verify that the specific ordering suffix matches the required packaging format, such as tape and reel quantities. Confirm RoHS compliance status through official documentation before integration. Ensure design validation covers all field use cases and extreme conditions, as application suitability remains the buyer's responsibility. Check for any custom binning options if tighter parameter tolerances are required for the target circuit.

Selection Notes

Select this component for sensitive amplifier stages requiring high input impedance and low noise in mid-frequency designs. The SMP4221TR variant provides surface-mount convenience while maintaining the electrical characteristics of the hermetically sealed TO-72 version. Consider the minimum I_DSS of 2mA and G_FS of 2000μS when designing bias networks to ensure proper operation within the specified voltage and current limits.

Part Context

This device belongs to the InterFET 2N4220/A and 2N4221/A family of N-Channel JFETs. The 'A' designation indicates screening for lower noise figures compared to standard variants. The product line supports multiple package types including through-hole TO-72 and TO-92, surface-mount SOT23, and bare die options, catering to diverse manufacturing and military application requirements.

Replacement Considerations

Direct pin-compatible replacements include the SMP4220TR for lower current applications or the standard 2N4221 without the 'A' noise screening if cost optimization is prioritized over noise performance. Verify that substitute components meet the -30V BV_GSS and 2mA I_DSS minimums.