SMP4221ATR

Overview

The InterFET SMP4221ATR is an N-channel silicon Junction Field-Effect Transistor (JFET) in the 2N4221A series, packaged in SOT-23 and supplied on a tape and reel. It features InterFET N0016H geometry with typical noise of 6 nV/√Hz and low input capacitance of 3.5pF. Key electrical parameters include a gate-to-source breakdown voltage of -30V, drain-to-source saturation current ranging from 2mA to 6mA, and forward transconductance between 2000μS and 5000μS. The device operates within a junction temperature range of -55°C to 150°C.

Feature Summary

• Utilizes InterFET N0016H geometry for high-performance analog applications
• Offers extremely low gate leakage currents typically less than 10pA at room temperature
• Provides high input impedance suitable for sensitive amplifier stages
• RoHS compliant with surface mount package options

Applications

• Mixers
• Oscillators
• Small Signal Amplifiers
• VHF Amplifiers

Procurement Notes

Verify that the specific order matches the SMP4221ATR suffix for SOT-23 tape and reel packaging. Confirm the requirement for the 'A' variant screening which ensures lower noise characteristics compared to standard versions. Ensure design validation covers all field use cases as application responsibility lies with the buyer.

Selection Notes

Select this component when low noise and high input impedance are critical for mid-frequency designs. The SOT-23 package facilitates surface mount integration. Consider the 'A' variant specifications if strict noise figure limits are required for the target application circuit.

Part Context

This part belongs to the 2N4220/A and 2N4221/A family of N-channel JFETs manufactured by InterFET Corporation. The manufacturer specializes in high-performance, precision, and low-noise analog transistors for aerospace, medical, military, and telecommunications industries.

Replacement Considerations

Direct equivalents include the 2N4221A through-hole TO-72 version or PN4221A TO-92 version if package changes are acceptable. Other variants like SMP4221 (non-A) share the same package but lack the screened low-noise characteristics.