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Product Detailed Parameters
- Description：JFET N-Channel -40V Low Ciss
- Series：SMP4118
- 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)：130 µA @ 10 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：2 V @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：1.8pF @ 10V
- Resistance - RDS(On)：9 kOhms
- 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 SMP4118A is an N-channel JFET from InterFET, designed for ultra-high input impedance applications. It features a -50V rating with a typical gate leakage of 120fA at 20V and low CISS of 1.8pF. The device offers a typical BVGSS of -60V and high radiation tolerance. Electrical characteristics include a V(BR)GSS of -40V minimum, IGSS of -10pA maximum, VGS(OFF) ranging from -1V to -3V, and IDSS between 0.08mA and 0.24mA. Forward transconductance (GFS) ranges from 80μS to 250μS.
Feature Summary
- Ultra-low gate leakage current for high-impedance signal integrity
- High radiation tolerance suitable for demanding environments
- Low input capacitance for high-frequency performance
- Compatible with femtoampere diode configurations
Applications
- Signal buffers and mixers
- Radar and satellite communications systems
- Medical imaging and ultrasound monitors
Procurement Notes
Verify the specific package variant required, as the SMP4118A designation covers surface mount SOT-23 bulk packaging. Confirm compliance requirements such as RoHS and REACH status directly with the manufacturer or authorized distributor. Ensure that custom binning options are requested if specific electrical parameter tightness is needed for the application.
Selection Notes
Select the SMP4118A when extremely low gate leakage and high input impedance are critical design constraints. Consider the SOT-23 package for space-constrained surface mount designs. Evaluate the -40V breakdown voltage against system operating conditions. Compare against industry standard crosses like MMBF4118 if pin compatibility is required.
Part Context
This component belongs to the 2N4117/A, 2N4118/A, and 2N4119/A family of N-channel JFETs. These devices utilize InterFET's proprietary N0001H geometry process. The family includes through-hole TO-72 and TO-92 variants alongside surface mount options. They are engineered for mid-to-high frequency designs requiring exceptional stability.
Replacement Considerations
Industry standard cross-references include SST4118, MMBF4118, 2N4118, and VCR7N. Verify pinout compatibility and electrical parameter tolerances before substitution. InterFET also lists SMP4118 and PN4118 as similar parts within their own portfolio.
