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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 SMP4118ATR is an N-Channel JFET from InterFET, packaged in SOT23 and supplied on a 7-inch or 13-inch tape and reel. It features a gate-to-source breakdown voltage of -40V and a typical gate leakage of 120fA at 20V. The device exhibits low input capacitance (Ciss) of 1.8pF typical and high radiation tolerance. Key electrical parameters include a drain-to-source saturation current (IDSS) range of 0.08mA to 0.24mA and a forward transconductance (GFS) between 80μS and 250μS.
Feature Summary
- Ultra-low gate leakage current for minimal circuit loading
- High radiation tolerance suitable for harsh environments
- Low input capacitance for high-frequency signal integrity
Applications
- Radar systems
- Satellite communications
- Medical imaging systems
- Signal mixers
- Buffers
Procurement Notes
Verify the specific suffix 'ATR' corresponds to the required tape and reel length (7-inch or 13-inch) as both are available for this part number. Confirm RoHS compliance status with the supplier. Ensure the ordering quantity meets the minimum requirements associated with the chosen reel size. Check for custom binning options if tighter parameter tolerances are needed for the application.
Selection Notes
Select the SMP4118ATR when ultra-high input impedance and femtoampere-level leakage are critical. Compare IDSS and GFS ranges against the specific circuit requirements. Consider the SOT23 package for surface mount constraints. Evaluate the need for radiation tolerance if operating in aerospace or military contexts. Verify thermal derating requirements for the intended operating temperature range.
Part Context
This component belongs to the 2N4117/A, 2N4118/A, and 2N4119/A family of N-Channel JFETs. These parts share similar structural characteristics but differ in specific electrical bins such as IDSS and GFS. The SMP series denotes the surface mount SOT23 variant, while the 'A' suffix typically indicates specific performance grading within the product line.
Replacement Considerations
Cross-reference with SST4118, MMBF4118, 2N4118, and VCR7N for potential direct replacements. Verify pinout compatibility and electrical parameter overlaps before substitution. Custom test and binning options may be available for alternative sourcing.
