2N5484_D74Z

Overview

The onsemi 2N5484_D74Z is a small signal N-channel silicon Junction Field-Effect Transistor (JFET) designed for low-noise and high-input impedance applications. It operates in depletion mode with a single element configuration housed in the TO-226AA cylindrical plastic package. Key electrical characteristics include a maximum feedback capacitance (Crss) of 1.2 pF, ensuring minimal signal coupling at high frequencies. The device utilizes through-hole terminals positioned at the bottom for secure board mounting.

Feature Summary

• Low noise performance suitable for sensitive analog signal paths
• High input impedance characteristic inherent to junction field-effect technology
• Depletion mode operation allowing current flow at zero gate-source voltage

Applications

• Low-noise preamplifier stages in audio equipment
• High-impedance buffer circuits for sensor interfaces
• Analog switching and modulation circuits

Procurement Notes

Verify the specific D74Z suffix against official manufacturer documentation to confirm exact binning or testing criteria, as suffixes often denote specific parameter ranges or manufacturing lot codes. Ensure the component matches the required TO-226AA form factor for your PCB footprint. Cross-reference the Crss value of 1.2 pF with your circuit requirements to validate high-frequency performance expectations.

Selection Notes

Select this component when a discrete N-channel JFET is required for low-noise amplification rather than integrated solutions. Compare the 1.2 pF feedback capacitance against other JFETs to ensure it meets your bandwidth constraints. Verify that the TO-226AA package size fits within your assembly space constraints compared to smaller surface-mount alternatives.

Part Context

This part belongs to the standard small-signal JFET family used in linear electronics. It serves as a fundamental active component for biasing circuits and impedance matching. The TO-226AA package is a legacy through-hole style, often found in industrial or legacy designs requiring robust mechanical mounting.

Replacement Considerations

Direct replacements include the 2N5484 generic equivalent or the 2N5485G from onsemi, though the latter has different voltage ratings. Verify pinout compatibility and thermal dissipation limits before substituting.