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Product Detailed Parameters
- Description：JFET N-Channell -40V Low Noise
- Series：-
- Mfr：InterFET
- Package：Strip
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：-
- Drain to Source Voltage (Vdss)：-
- Current - Drain (Idss) @ Vds (Vgs=0)：-
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：-
- Input Capacitance (Ciss) (Max) @ Vds：18pF @ 10V
- Resistance - RDS(On)：-
- Power - Max：-
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：SOT-23-3
- Supplier Device Package：SOT-23
- Grade：-
- Qualification：-
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Overview
The InterFET SMP4856 is an N-Channel Junction Field-Effect Transistor (JFET) utilizing the proprietary N0132S geometry. It is housed in a surface-mount SOT23 package and rated for a gate-to-source breakdown voltage of -40 V. The device exhibits a drain-to-source saturation current (IDSS) range of 50 mA to 100 mA at VDS = 15 V and VGS = 0 V, with a gate-to-source cutoff voltage (VGS(off)) between -4 V and -10 V. Key electrical parameters include a maximum continuous power dissipation of 1800 mW, an operating junction temperature range of -55°C to 125°C, and a typical noise figure of 1.2 nV/√Hz.
Feature Summary
- Utilizes InterFET N0132S geometry for optimized low-noise performance and fast switching capabilities.
- Features extremely low gate leakage currents, typically measured at 50 pA at room temperature.
- Designed specifically for very low noise switching applications within mid to high frequency circuit designs.
Applications
- Chopper circuits
- Commutators
- Analog switches
Procurement Notes
Verify that the specific ordering suffix corresponds to the required packaging format, such as bulk or tape and reel quantities. Confirm RoHS compliance status and ensure the selected variant matches the necessary electrical binning for IDSS and VGS(off) specifications before finalizing procurement orders.
Selection Notes
Select the SMP4856 when a surface-mount JFET with low noise characteristics is required for mid-to-high frequency designs. Consider the specific IDSS and VGS(off) ranges provided in the datasheet to ensure compatibility with the target circuit's biasing requirements and signal integrity needs.
Part Context
The SMP4856 belongs to the InterFET 2N4856/A, 2N4857/A, and 2N4858/A family of N-Channel JFETs. This series offers multiple package options including through-hole TO-18, TO-92, and surface-mount SOT23 configurations. The components are engineered for robust performance in demanding analog switching environments.
Replacement Considerations
Direct replacements within the same family include SMP4857 and SMP4858. For through-hole equivalents, consider 2N4856, PN4856, or their 'A' variants. Verify pinout compatibility and electrical parameter overlaps before substituting.
FAQ
What is the typical noise level of the SMP4856?
The SMP4856 features a typical noise level of 1.2 nV/√Hz.
What is the maximum continuous forward gate current rating?
The maximum continuous forward gate current is rated at 50 mA.
Does the SMP4856 support military-grade hermetic sealing?
No, the SMP4856 uses a plastic SOT23 package. Hermetically sealed TO-18 packages are available in the 2N4856 series for military applications.
