JANTX2N4859

Overview

The JANTX2N4859 is a small signal N-channel silicon junction field-effect transistor (JFET) manufactured by Microsemi. It operates in depletion mode with a maximum drain-source breakdown voltage of 30V and a maximum on-resistance of 25 ohms. The device features fast switching capabilities and utilizes a TO-206AA metal cylindrical package, similar to the TO-18 form factor, containing three pins. The gate terminal serves as the case connection.

Feature Summary

• Utilizes silicon junction FET technology for reliable small signal amplification
• Features fast switching performance characteristics
• Constructed with a metal cylindrical package suitable for through-hole mounting

Applications

• Small signal amplification circuits
• Electronic switching applications requiring fast response
• Analog signal processing systems

Procurement Notes

Verify the manufacturer designation carefully, as this component has been produced by multiple vendors including TEMIC and Vishay. Confirm that the specific ordering suffix corresponds to the required radiation hardness or quality level. Ensure the package type matches the intended PCB footprint, as variations exist between TO-206AA and other similar styles. Cross-reference datasheets from different suppliers to confirm parameter consistency before finalizing procurement.

Selection Notes

Select this component when a depletion mode N-channel JFET with a 30V breakdown voltage is required. The 25-ohm on-resistance makes it suitable for low-current switching or amplification tasks. Consider the TO-206AA package constraints for mechanical integration. Evaluate the fast switching attribute against circuit speed requirements to ensure compatibility with the intended application frequency range.

Part Context

This part belongs to the 2N4859 series of N-channel JFETs. The JANTX suffix typically denotes a screened version of the standard military specification part, offering tighter parameter tolerances compared to the baseline JAN variant. The series includes related parts such as the 2N4856 through 2N4861, which share similar structural characteristics but may differ in specific electrical thresholds.

Replacement Considerations

The JANTXV2N4859 is a verified substitute within the same family, offering potentially stricter screening levels. Standard commercial equivalents like the MX2N4859 are available but lack the specific qualification status. Verify pinout compatibility and electrical parameter overlaps when considering alternative manufacturers.