MMBFJ309

Overview

The MMBFJ309LT1G is an N-channel Junction Field-Effect Transistor (JFET) manufactured by onsemi, designed for high-frequency amplifier and oscillator applications. It features a single configuration housed in a space-saving SOT-23 surface-mount package. Key electrical parameters include a drain-source breakdown voltage of 25 V and a gate-source breakdown voltage of 25 V. The device supports a maximum continuous drain current of 10 mA and operates with a zero-gate-voltage drain current ranging from 12 mA to 30 mA. It exhibits a gate-source cutoff voltage of up to -4 V and functions reliably within a maximum operating temperature of 150 °C.

Feature Summary

• Designed for high-frequency amplifier and oscillator circuits
• Features interchangeable drain and source terminals for flexible PCB layout
• Low on-resistance contributes to higher efficiency and extended battery life
• Compliant with AEC-Q101 automotive qualification standards

Applications

• High-frequency amplifiers
• Oscillators
• Low-noise amplifiers
• Impedance conversion stages
• Analog switches and choppers

Procurement Notes

Verify the specific ordering suffix when purchasing, as variants such as LT1G indicate reel packaging. Confirm RoHS compliance status through official datasheets or manufacturer compliance statements prior to integration. Ensure the selected component matches the required channel polarity and package type for the target design. Cross-reference part numbers with authorized distributors to avoid counterfeit components.

Selection Notes

Select this component for designs requiring N-channel JFETs with low noise characteristics and high-frequency performance. The SOT-23 package suits space-constrained surface-mount applications. Verify that the required drain current and breakdown voltages align with circuit specifications. Consider the AEC-Q101 qualification if the application demands automotive-grade reliability. Evaluate thermal management requirements given the 150 °C maximum junction temperature limit.

Part Context

This component belongs to the MMBFJ309L series of N-channel JFETs produced by onsemi. It is categorized under discrete semiconductor transistors and falls within the broader JFET product family. The device utilizes silicon technology and is intended for general-purpose analog signal processing tasks where low noise and high input impedance are critical design factors.

Replacement Considerations

The MMBFJ108 is a documented alternative from onsemi offering similar SOT-23 packaging but with different current and voltage ratings. Verify pinout compatibility and electrical parameter alignment before substitution. Other N-channel JFETs may require schematic adjustments due to variations in IDSS or VGS(off).

FAQ

What is the maximum operating temperature for the MMBFJ309LT1G?

The maximum operating temperature is 150 °C.

Does the MMBFJ309LT1G support automotive applications?

Yes, the device is compliant with AEC-Q101 automotive qualification standards.

Can the drain and source terminals be interchanged?

Yes, the device provides interchangeable drain and source terminals to simplify PCB layout.