MMBF4117

Overview

The MMBF4117 is an N-channel Junction Field-Effect Transistor (JFET) switch designed for low current DC and audio applications. It provides excellent performance as an input stage for sub-picoamp instrumentation or any high impedance signal sources. The device is sourced from Process 53 and features a SOT-23 (TO-236AB) 3-pin surface-mount package. Key electrical characteristics include a drain-gate voltage rating of 40 V, a gate-source voltage rating of -40 V, and an operating junction temperature range of -55°C to +150°C. The typical zero-gate voltage drain current is 90 pA, with a common-source forward transconductance of 3.0 µS at VDS=10V.

Feature Summary

• Designed specifically for low current DC and audio applications requiring minimal leakage.
• Provides excellent performance as an input stage for sub-picoamp instrumentation circuits.
• Suitable for interfacing with high impedance signal sources due to very low input current requirements.

Applications

• Sub-picoamp instrumentation input stages
• High impedance signal source buffering
• Low current DC switching applications
• Audio circuit signal routing

Procurement Notes

Verify the specific ordering suffix and tape-and-reel packaging details against the official onsemi datasheet before procurement. Confirm that the component is sourced from the designated manufacturing process to ensure compliance with specified electrical parameters. Check for any recent part number updates resulting from the Fairchild Semiconductor integration into onsemi to avoid ordering discrepancies.

Selection Notes

Select the MMBF4117 when designing circuits that demand extremely low gate leakage currents and high input impedance. It is appropriate for precision analog front ends where standard MOSFETs may introduce unacceptable bias currents. Ensure the application operates within the specified voltage limits and thermal constraints to maintain reliability and performance stability over the required temperature range.

Part Context

The MMBF4117 is part of onsemi's portfolio of discrete semiconductor devices, originally developed under Fairchild Semiconductor. It belongs to the family of N-channel JFET switches optimized for sensitive analog applications. The device leverages established fabrication processes to deliver consistent performance in low-power signal conditioning environments, serving as a critical component in precision measurement and audio equipment designs.

Replacement Considerations

Direct replacements include MMBF4118 and MMBF4119, which share similar N-channel JFET characteristics but may differ in specific parameter tolerances or top markings. Verify pinout compatibility and electrical specifications against the target application requirements before substitution.

FAQ

What is the maximum drain-gate voltage rating for the MMBF4117?

The absolute maximum drain-gate voltage (VDG) rating for the MMBF4117 is 40 V.

In what type of packages is the MMBF4117 available?

The MMBF4117 is available in a SOT-23 (also referred to as TO-236AB) 3-pin surface-mount package.

What is the typical zero-gate voltage drain current for this device?

The typical zero-gate voltage drain current (IDSS) is 90 pA, measured under specific test conditions.