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Product Detailed Parameters
- Description：JFET N-Channel -40V Low Noise
- Series：SMP4392
- Mfr：InterFET
- Package：Strip
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：-
- Drain to Source Voltage (Vdss)：40 V
- Current - Drain (Idss) @ Vds (Vgs=0)：35 mA @ 20 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：2.5 V @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：13pF @ 20V
- Resistance - RDS(On)：45 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 SMP4392 is an N-channel JFET from InterFET, utilizing the proprietary N0132S geometry. It operates with a gate-to-source breakdown voltage of -40V and features low noise characteristics with a typical input of 1.2 nV/√Hz. The device exhibits fast switching capabilities and extremely low gate leakage, typically under 50pA at room temperature. Key electrical parameters include a drain-to-source saturation current (IDSS) ranging from 25mA to 75mA and a gate-to-source cutoff voltage (VGS(off)) between -2V and -5V. Static on-resistance is specified between 30Ω and 60Ω.
Feature Summary
- Utilizes InterFET's N0132S geometry for optimized performance
- Provides low noise operation suitable for sensitive signal paths
- Features exceptionally low gate leakage currents
- Designed for rapid switching applications
Applications
- Low on-resistance analog switches
- Chopper circuits
- Commutator designs
Procurement Notes
Verify the specific package configuration required for the design, as the SMP4392 is available in SOT23 bulk or tape and reel formats. Confirm that the ordering suffix aligns with the desired quantity constraints, such as the maximum pieces allowed per reel size. Ensure compliance with RoHS standards if applicable to the end product requirements.
Selection Notes
Select this component when low noise and high-speed switching are critical within an N-channel JFET architecture. The SMP4392 offers a balance of moderate IDSS and tight VGS(off) tolerances compared to its siblings. Consider the SOT23 surface mount form factor for compact PCB layouts while maintaining the hermetic-like reliability associated with InterFET's fabrication processes.
Part Context
This part belongs to the 2N4391-2-3 family of N-channel JFETs manufactured by InterFET. The series shares common structural technologies but varies in electrical thresholds like IDSS and VGS(off). The SMP4392 specifically denotes the surface-mount SOT23 variant, providing a modern packaging alternative to the traditional through-hole TO-18 or TO-92 options found in the same product line.
Replacement Considerations
Direct replacements within the same family include the SMP4391 and SMP4393, which share identical pinouts and physical dimensions but differ in saturation current and cutoff voltage specifications. Verify that the alternative part's electrical limits meet the specific circuit requirements before substitution.
FAQ
What is the typical gate leakage current for the SMP4392?
Gate leakage is typically less than 50pA at room temperature.
Does the SMP4392 support surface mount assembly?
Yes, the SMP4392 is available in the SOT23 surface mount package.
What is the maximum reverse gate-source voltage rating?
The maximum reverse gate-source and gate-drain voltage is rated at -40V.
