J310_D74Z

Overview

The J310_D74Z is an N-channel silicon Junction Field-Effect Transistor (JFET) manufactured by onsemi. It is housed in a TO-92 three-terminal through-hole package designed for small-signal applications. The device operates in depletion mode and is characterized for UHF band performance, making it suitable for high-frequency amplification tasks. Key electrical parameters include a maximum feedback capacitance of 2.5 pF, which supports its classification as an RF small-signal component.

Feature Summary

• N-channel silicon construction optimized for small-signal operations
• UHF band capability for high-frequency signal processing
• Low feedback capacitance supporting RF amplifier stability

Applications

• UHF band amplification circuits
• RF small-signal processing stages
• General-purpose transistor amplifier designs

Procurement Notes

Verify the manufacturer designation carefully, as the J310 part number has been produced by multiple semiconductor vendors including Texas Instruments and Fairchild. Confirm that the specific D74Z suffix corresponds to the desired packaging and quality grade from onsemi. Cross-reference the datasheet revision to ensure compatibility with the intended circuit design requirements before finalizing procurement.

Selection Notes

Select this component when an N-channel JFET with low input capacitance is required for UHF frequency ranges. Ensure the application voltage and current limits align with the device specifications. Consider the TO-92 package constraints regarding thermal dissipation and board space compared to surface-mount alternatives.

Part Context

This component belongs to the family of general-purpose N-channel JFETs commonly used in analog signal conditioning. It serves as a discrete active element in linear circuits where high input impedance and low noise are beneficial. The TO-92 form factor allows for easy integration into legacy and educational hardware designs.

Replacement Considerations

Direct substitutes may include other N-channel JFETs in TO-92 packages such as the 2N5457 or J112, provided pinouts and electrical characteristics match. Verify that alternative devices meet the UHF bandwidth and capacitance requirements of the original design.