2N4859

Jfets Overview

The Microchip Technology 2N4859 is a silicon N-channel Junction Field-Effect Transistor (JFET) designed for small-signal applications. It operates in depletion mode and features a single-element configuration housed in a TO-18 metal can package with three pins. The device has a minimum drain-source breakdown voltage of 30V and a maximum drain-source on-resistance of 25 ohms. It is constructed using silicon technology and supports through-hole mounting. The component is classified as a general-purpose JFET suitable for circuits requiring fast switching capabilities.

Jfets Feature Summary

• Utilizes silicon junction field-effect transistor technology for reliable signal processing
• Features a robust metal cylindrical TO-18 package suitable for through-hole installation
• Designed for fast switching operations within small-signal circuit environments

Jfets Applications

• Small-signal amplification stages
• Fast switching circuits
• General-purpose analog signal processing

Jfets Procurement Notes

Verify the specific manufacturer source, as historical data indicates production by entities such as TEMIC under this designation. Confirm RoHS compliance status and current availability directly with authorized distributors or the manufacturer, as stock levels and production cycles vary. Ensure the ordering suffix matches the required military or commercial grade specifications documented in the official datasheet.

Jfets Selection Notes

Select the 2N4859 when an N-channel depletion-mode JFET with a 30V breakdown voltage is required. Consider the 25 ohm maximum on-resistance for low-impedance switching applications. The TO-18 package necessitates through-hole PCB layouts. Verify thermal management requirements and ensure the operating temperature range aligns with the component's specified limits for the intended environment.

Jfets Part Context

The 2N4859 belongs to the broader category of small-signal field-effect transistors manufactured by Microchip Technology and its acquired legacy lines. It shares functional similarities with other N-channel JFETs but is distinct due to its specific 30V rating and TO-18 packaging. This part number represents a standard industry designation often associated with historical semiconductor manufacturers now integrated into Microchip's portfolio.

Jfets Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Evaluate equivalent N-channel JFETs with matching 30V breakdown voltage and TO-18 package constraints. Verify pinout compatibility and electrical parameters before substitution.