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Product Detailed Parameters
- Description：JFET N-CH 40V SOT23-3
- Series：-
- Mfr：onsemi
- Package：Tape & Reel (TR)
- FET Type：N-Channel
- Voltage - Breakdown (V(BR)GSS)：40 V
- Drain to Source Voltage (Vdss)：-
- Current - Drain (Idss) @ Vds (Vgs=0)：80 µA @ 10 V
- Current Drain (Id) - Max：-
- Voltage - Cutoff (VGS off) @ Id：1 V @ 1 nA
- Input Capacitance (Ciss) (Max) @ Vds：3pF @ 10V
- Resistance - RDS(On)：-
- Power - Max：225 mW
- Operating Temperature：-55°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-236-3, SC-59, SOT-23-3
- Supplier Device Package：SOT-23-3
- Grade：-
- Qualification：-
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Overview
The MMBF4118 is an N-Channel JFET switch manufactured by onsemi, originally from Fairchild Semiconductor. It is housed in a SOT-23 3L package with interchangeable source and drain terminals. The device features a gate-source breakdown voltage of -40 V and operates within a junction temperature range of -55°C to +150°C. Electrical characteristics include a zero-gate voltage drain current (IDSS) ranging from 80 µA to 240 µA at VDS = 10 V, and a common-source forward transconductance (gfs) between 80 µmhos and 250 µmhos at 1.0 kHz.
Feature Summary
- Designed for low current DC and audio applications
- Provides excellent performance as input stages for sub-picoamp instrumentation
- Suitable for high impedance signal sources
Applications
- Low current DC switching
- Audio circuit applications
- Input stages for sub-picoamp instrumentation
- High impedance signal source interfacing
Procurement Notes
Verify the specific part number against the manufacturer's current database, as legacy Fairchild part numbers may have been updated during integration into ON Semiconductor systems. Confirm that the ordering suffix matches the required packing method, which is tape and reel for this component. Ensure compliance with RoHS standards and check for any recent product change notices affecting the device specifications or manufacturing location.
Selection Notes
Select the MMBF4118 when a specific IDSS range of 80 µA to 240 µA is required, distinguishing it from the MMBF4117 and MMBF4119 variants. Consider the SOT-23 package constraints and the interchangeability of source and drain pins for PCB layout flexibility. Validate thermal dissipation limits and junction temperature ratings for the intended operating environment to ensure reliability under steady-state conditions.
Part Context
This component belongs to the MMBF4117/4118/4119 family of N-Channel Switches. These devices are sourced from process 53 and share similar physical dimensions and absolute maximum ratings. The MMBF4118 serves as the middle variant in terms of electrical parameters, specifically regarding gate-source cut-off voltage and drain current, offering a balance between the lower current MMBF4117 and higher current MMBF4119.
Replacement Considerations
Direct substitutes within the same family include the MMBF4117 and MMBF4119, provided their specific IDSS and VGS(off) ranges align with the design requirements. Verify pinout compatibility due to the interchangeable source and drain configuration.
