PN4393

Overview

The PN4393 is a single N-channel silicon Junction Field-Effect Transistor (JFET) manufactured by onsemi. It is housed in a TO-92 package with kinked leads for through-hole mounting. The device operates in depletion mode and features a gate-source breakdown voltage of -30 V. Key electrical characteristics include a maximum drain-source on-resistance of 100 Ω, a maximum reverse transfer capacitance (Crss) of 3.5 pF, and a power dissipation rating of 625 mW.

Feature Summary

• N-channel junction field-effect transistor configuration
• Depletion mode operation capability
• Through-hole TO-92 package construction

Applications

• Small signal switching circuits
• Analog signal routing applications
• Low-power electronic assemblies

Procurement Notes

Verify the specific manufacturer source when procuring this component, as it appears in catalogs from onsemi/Fairchild, Central Semiconductor, and Rochester Electronics. Confirm that the TO-92 kinked lead variant matches the design requirements. Ensure compliance with RoHS directives if required by the target application specifications.

Selection Notes

Select this component for low-voltage analog switching tasks requiring minimal leakage current. The TO-92 form factor suits prototyping and low-volume through-hole designs. Evaluate the 100 Ω on-resistance against circuit impedance needs to ensure adequate signal transmission without excessive attenuation or loading effects.

Part Context

This JFET belongs to the broader category of small-signal field-effect transistors used for precise control of electron flow in semiconductor devices. Unlike MOSFETs, JFETs are normally-on devices that require negative gate bias to turn off, making them suitable for specific linear and switching roles distinct from enhancement-mode counterparts.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.