2N4859UB

Jfets Overview

The 2N4859UB is a silicon N-channel Junction Field-Effect Transistor (JFET) manufactured by Microchip Technology. Designed for through-hole mounting, it utilizes the TO-18-3 metal can package. The device operates with a maximum drain-source voltage of 30V and supports a continuous drain current of 50mA. It features a power dissipation rating of 360mW at 25°C ambient temperature. The component is classified as a general-purpose JFET suitable for analog switching and amplification applications requiring low noise characteristics.

Jfets Feature Summary

• Utilizes silicon technology for stable junction field-effect operation
• Encapsulated in a hermetically sealed TO-18-3 metal can for environmental protection
• Designed for through-hole PCB integration

Jfets Applications

• Low-noise signal amplification circuits
• Analog switching applications
• Constant current source implementations

Jfets Procurement Notes

Verify the manufacturer part number against official Microchip Technology documentation to ensure authenticity. Confirm that the TO-18-3 package dimensions match the design requirements. Check for specific lot traceability or military-grade qualification if required by the application specifications. Ensure compliance with relevant RoHS directives if applicable to the project constraints.

Jfets Selection Notes

Select this component when a ruggedized, hermetically sealed JFET is required for high-reliability environments. The TO-18-3 package offers superior thermal and mechanical stability compared to plastic packages. Consider the 30V breakdown voltage and 50mA current limits to ensure adequate headroom for the intended circuit design. Evaluate the need for through-hole mounting versus surface-mount alternatives based on assembly capabilities.

Jfets Part Context

The 2N4859 series represents a legacy line of silicon JFETs maintained by Microchip Technology. These components are often specified in aerospace, defense, and industrial equipment where long-term availability and proven reliability are critical. The 'UB' suffix typically denotes specific binning or testing criteria defined by the manufacturer for performance consistency within the series.