2N4858UB

Jfets Overview

The 2N4858UB is an N-channel silicon small-signal Junction Field-Effect Transistor (JFET) manufactured by Microchip Technology. It utilizes a TO-18-3 metal can package designed for through-hole mounting. The device operates in depletion mode and features a drain-source breakdown voltage of 40 V with a maximum gate-source voltage rating of -40 V. It supports a continuous power dissipation of 360 mW at 25°C ambient temperature. The component functions within an extended operating temperature range from -65°C to +200°C, ensuring reliability in high-temperature environments.

Jfets Feature Summary

• High-temperature capability up to 200°C for demanding operational environments
• Metal can construction providing robust physical protection
• N-channel JFET technology optimized for small-signal applications

Jfets Applications

• High-reliability analog signal processing circuits
• Military and aerospace electronic systems requiring rugged components
• Precision low-noise amplifier stages

Jfets Procurement Notes

Verify the specific ordering suffix against official Microchip documentation to confirm exact electrical binning and qualification levels. Ensure the procurement channel provides valid traceability records. Confirm that the component meets the required environmental standards for the intended deployment. Cross-reference the manufacturer part number with current datasheets to validate specifications before finalizing orders.

Jfets Selection Notes

Select this component when a high-temperature rated N-channel JFET is required for critical applications. Compare the 40V breakdown voltage and 360mW power dissipation against circuit requirements. Consider the TO-18 package constraints for PCB layout. Evaluate alternative models within the same family if different voltage or current ratings are necessary for the specific design.

Jfets Part Context

This device belongs to a series of high-reliability JFETs produced by Microchip Technology. It shares architectural similarities with other models in the lineup, such as the 2N4857 and 2N4859, which offer varying voltage and current characteristics. These components are typically utilized in specialized industrial and defense sectors where standard commercial parts do not meet performance or durability standards.

Jfets Replacement Considerations

Direct substitutes include the 2N4857 and 2N4859, provided their respective voltage and current ratings align with the circuit design. Verify pinout compatibility and thermal management requirements when swapping between these variants.