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Product Detailed Parameters
- Description：JFET N-Channel -30V Low Ciss
- Series：SMP4221
- Mfr：InterFET
- Package：Strip
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：-
- Drain to Source Voltage (Vdss)：30 V
- Current - Drain (Idss) @ Vds (Vgs=0)：2.8 mA @ 15 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：2.5 V @ 0.1 nA
- Input Capacitance (Ciss) (Max) @ Vds：3pF @ 15V
- Resistance - RDS(On)：500 Ohms
- Power - Max：350 mW
- Operating Temperature：-55°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：SOT-23-3
- Supplier Device Package：SOT-23-3
- Grade：-
- Qualification：-
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Overview
The InterFET SMP4221A is an N-channel JFET in a SOT-23 surface-mount package, part of the 2N4221/A series. 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 (BV_GSS) of -30V, drain-to-source saturation current (I_DSS) minimum of 2mA, and forward transconductance (G_FS) minimum of 2000μS. Gate leakage is typically less than 10pA at room temperature.
Feature Summary
- Utilizes InterFET N0016H geometry for optimized performance
- Designed for sensitive amplifier stages with high input impedance
- Screened 'A' variants offer lower noise characteristics
- Available in SMT, through-hole, and bare die options
Applications
- Mixers
- Oscillators
- Small Signal Amplifiers
- VHF Amplifiers
Procurement Notes
Verify the specific suffix 'A' indicates the screened low-noise variant as documented. Confirm the SOT-23 package type matches the SMP prefix designation. Ensure design validation covers all field use cases and extreme conditions per the manufacturer's disclaimer. Check for custom binning availability if specific parameter ranges are required beyond standard minimums.
Selection Notes
Select the SMP4221A for applications requiring low noise and high input impedance in a compact surface-mount form factor. The 'A' variant ensures stricter noise screening compared to standard versions. Consider the TO-72 hermetically sealed option for military or harsh environment requirements where SMT is unsuitable. Verify that the -30V breakdown voltage meets the circuit's maximum operating limits.
Part Context
This component belongs to the InterFET 2N4220/A and 2N4221/A family of N-channel JFETs. These devices are engineered for mid-frequency sensitive amplifier designs. The family includes various packaging options such as TO-72, TO-92, SOT-23, and bare die configurations to suit different manufacturing and environmental needs.
Replacement Considerations
The SMP4221A is the surface-mount equivalent of the through-hole 2N4221A. Direct pin-compatible replacements within the same family include the SMP4221 (standard noise) or PN4221A (TO-92). Cross-brand substitutions require careful verification of noise figures and transconductance parameters.
