2N5459

Overview

The onsemi 2N5459 is a small signal N-channel silicon Junction Field-Effect Transistor (JFET) designed for low-noise applications. It operates in depletion mode and features a maximum feedback capacitance of 3 pF. The device is housed in a TO-226AA cylindrical plastic/epoxy package with three through-hole terminals positioned at the bottom. As a single-element FET, it utilizes silicon as the transistor element material. The component is not surface mountable and is classified under JEDEC-95 code TO-226AA.

Feature Summary

• Low noise performance suitable for sensitive signal processing
• Depletion mode operation for specific biasing requirements
• Minimal feedback capacitance to reduce signal distortion

Applications

• Low-noise amplifier circuits
• High-impedance input stages
• Audio pre-amplification systems

Procurement Notes

Verify the specific manufacturer source and revision level when sourcing this component, as multiple manufacturers produce equivalent JFETs. Confirm that the TO-226AA package matches your PCB footprint requirements. Ensure the depletion mode characteristic aligns with your circuit design needs. Check for any RoHS compliance documentation if required by your manufacturing standards. Validate terminal configuration against schematic symbols.

Selection Notes

Select this component for designs requiring an N-channel JFET with low input capacitance. The TO-226AA package is suitable for through-hole assembly processes. Consider the depletion mode operation when designing gate bias networks. Compare the 3 pF feedback capacitance against other JFETs if minimizing Miller effect is critical. Ensure the voltage ratings meet the specific application demands.

Part Context

This part belongs to the family of small signal junction field-effect transistors. It shares functional similarities with other N-channel JFETs like the 2N5458 or 2N5457, though pinouts and specific electrical limits may vary. The TO-226AA package is a standard cylindrical leaded form factor commonly used for discrete semiconductor devices requiring robust mechanical mounting.

Replacement Considerations

Direct substitutes include the 2N5458 and 2N5457, provided their electrical parameters such as breakdown voltage and pinch-off current are compatible with the original design specifications. Verify pinout compatibility before substitution.