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Product Detailed Parameters
- Description：JFET N-Channel -40V Low Ciss
- Series：SMP4118
- 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)：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 SMP4118TR is an N-Channel JFET in a SOT-23 surface-mount package. It features a gate-to-source breakdown voltage of -40V and a typical gate leakage current of 10pA at VGS = -20V. The drain-to-source saturation current ranges from 0.08mA to 0.24mA, with a cutoff voltage between -1V and -3V. Forward transconductance spans 80μS to 250μS, while input capacitance is typically 3pF.
Feature Summary
- Ultra-low gate leakage current for high-impedance applications
- High radiation tolerance via proprietary InterFET processes
- Low input capacitance suitable for mid-to-high frequency designs
Applications
- Radar systems
- Satellite communications
- Medical imaging systems
- Signal mixers
Procurement Notes
Verify the specific suffix 'TR' indicates tape and reel packaging containing up to 3,000 pieces per 7-inch reel or 9,000 pieces per 13-inch reel. Confirm compliance with RoHS, REACH, and CMR standards. Ensure the ordering part number matches the required A-variant specifications if tighter parameter limits are necessary for the design.
Selection Notes
Select this component when ultra-high input impedance and low gate leakage are critical. The SOT-23 package offers a compact surface-mount solution compared to through-hole alternatives like TO-72. Consider the -40V rating for appropriate biasing margins. Verify that the forward transconductance range meets the gain requirements of the target circuit topology.
Part Context
This device belongs to the 2N4117/A, 2N4118/A, and 2N4119/A family of N-Channel JFETs manufactured by InterFET. It utilizes InterFET's N0001H geometry and is designed for femtoampere diode applications. The SMP4118TR serves as a surface-mount equivalent to through-hole variants such as the 2N4118.
Replacement Considerations
- SMP4118
- MMBF4118
- SST4118
FAQ
Are the source and drain pins interchangeable?
Yes, the source and drain pins are interchangeable on the SOT-23 package.
What is the maximum operating junction temperature?
The maximum operating junction temperature is 150°C.
Does the device support femtoampere diode applications?
Yes, parts can be connected specifically for femtoampere diode applications due to their low gate leakage characteristics.
