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Product Detailed Parameters
- Description：JFET N-Channel -40V Low Noise
- Series：SMP4393
- Mfr：InterFET
- Package：Tape & Reel (TR)
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：-
- Drain to Source Voltage (Vdss)：40 V
- Current - Drain (Idss) @ Vds (Vgs=0)：12 mA @ 20 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：1.5 V @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：13pF @ 20V
- Resistance - RDS(On)：70 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 SMP4393TR is an N-Channel JFET from the InterFET 2N4391-2-3 series, utilizing N0132S geometry for low noise and fast switching. It features a -40V gate-to-source breakdown voltage (BV_GSS) and a typical noise figure of 1.2 nV/√Hz. The device exhibits a drain-to-source saturation current (I_DSS) range of 5 to 30 mA and a gate-to-source cutoff voltage (V_GS(off)) between -0.5 V and -3.0 V. Static on-resistance (R_DS(on)) ranges from 30 to 100 Ω at 1 kHz. Dynamic characteristics include a turn-on delay of 15 ns and rise time of 5 ns. Input capacitance is 14 pF, while reverse transfer capacitance is 3.5 pF.
Feature Summary
- Utilizes InterFET N0132S geometry for optimized performance
- Provides low noise operation with typical 1.2 nV/√Hz specification
- Enables fast switching capabilities suitable for high-speed applications
- Features low cutoff voltage ideal for low-level power supply designs
Applications
- Low on-resistance analog switches
- Chopper circuits
- Commutator designs
Procurement Notes
Verify the specific suffix TR indicates tape and reel packaging configuration as documented in the ordering information section. Confirm that the component meets RoHS compliance requirements before integration. Ensure design validation covers all field use cases and extreme conditions, as application responsibility rests with the buyer. Cross-reference the SOT23 package dimensions against JEDEC standards for proper PCB layout implementation.
Selection Notes
Select this component when low noise and fast switching are critical for analog signal processing. The low cutoff voltage makes it suitable for low-level power supply applications compared to higher threshold variants. Consider the SOT23 surface mount package for space-constrained designs. Evaluate the specific I_DSS and V_GS(off) ranges required for the target circuit biasing conditions.
Part Context
This part belongs to the InterFET 2N4391, 2N4392, and 2N4393 family of N-Channel JFETs. The SMP4393TR specifically denotes the surface mount version in SOT23 packaging supplied in tape and reel format. Other family members include through-hole TO-18 and TO-92 packages, as well as bare die options for specialized integration needs.
Replacement Considerations
Direct substitutes within the same family include SMP4391TR and SMP4392TR, which share identical packaging but differ in electrical parameters such as I_DSS and V_GS(off). Through-hole equivalents are available as 2N4393 or PN4393. Verify pinout compatibility and electrical limits before substitution.
FAQ
What is the typical noise figure for the SMP4393TR?
The typical noise figure is 1.2 nV/√Hz.
What is the maximum gate-to-source breakdown voltage?
The maximum gate-to-source breakdown voltage (BV_GSS) is -40 V.
What is the input capacitance value?
The input capacitance (C_iss) is 14 pF at V_DS = 20V and V_GS = 0V.
