SMP4220

Overview

The InterFET SMP4220 is an N-channel Junction Field-Effect Transistor (JFET) designed for sensitive amplifier stages in mid-frequency applications. It utilizes the InterFET N0016H geometry and operates with a Gate-to-Source Breakdown Voltage of -30 V minimum. The device features a Drain-to-Source Saturation Current ranging from 0.5 mA to 3 mA, with a Gate-to-Source Cutoff Voltage between -4 V and -6 V. Forward transconductance typically spans 1000 μS to 4000 μS at 1 kHz. Input capacitance is approximately 6 pF at 1 MHz, supporting low-noise performance suitable for precision analog circuits.

Feature Summary

• Utilizes InterFET N0016H geometry for optimized performance
• Features extremely low gate leakage current, typically less than 10 pA at room temperature
• Offers high input impedance and low input capacitance characteristics
• Available in Surface Mount Technology (SMT), Through-Hole, and bare die package options

Applications

• Mixers
• Oscillators
• Small Signal Amplifiers
• VHF Amplifiers

Procurement Notes

Verify that the specific part number suffix matches the required packaging format, such as bulk SOT23 or tape and reel configurations. Confirm whether the 'A' variant screening for lower noise is necessary for the application requirements. Ensure compliance with RoHS standards and validate that the selected package aligns with the intended PCB layout and thermal management constraints.

Selection Notes

Select the SMP4220 when designing mid-frequency circuits requiring high input impedance and minimal signal distortion. Consider the 'A' variant if strict low-noise specifications are critical for the system. Evaluate the SOT23 package dimensions against available board space and ensure compatibility with suggested pad layouts for reliable soldering processes.

Part Context

The SMP4220 belongs to the InterFET 2N4220/A and 2N4221/A family of N-channel JFETs. This series is engineered for robust operation in demanding environments, offering hermetically sealed TO-72 options for military use alongside standard plastic packages. The devices share core electrical characteristics but differ primarily in manufacturing lot screening and physical packaging formats.

Replacement Considerations

Direct substitutes include the SMP4221, which shares identical pinouts and similar electrical parameters within the same product family.