2N4857UB

Jfets Overview

The 2N4857UB is an N-channel silicon small-signal Junction Field-Effect Transistor (JFET) manufactured by Microchip Technology. It utilizes a TO-18 metal can package with three leads and supports through-hole mounting. The device operates in depletion mode with a maximum drain-source voltage of 40 V and a gate-source voltage limit of 40 V. Key electrical parameters include a maximum drain current of 50 mA, a power dissipation rating of 360 mW at 25°C, and a maximum on-resistance of 40 Ohms. The component functions within a temperature range from -65°C to +200°C.

Jfets Feature Summary

• Utilizes silicon JFET technology for signal processing applications
• Features a hermetically sealed metal can construction for environmental protection
• Supports high-temperature operation up to 200°C

Jfets Applications

• High-reliability analog switching circuits
• Low-noise amplifier input stages
• Military and aerospace electronic systems

Jfets Procurement Notes

Verify the specific suffix 'UB' against the manufacturer's official datasheet to confirm pinout orientation and mechanical dimensions. Ensure that the procurement documentation explicitly references the MIL-PRF-19500 standard compliance if required for the application. Confirm RoHS status as non-compliant based on available product attributes.

Jfets Selection Notes

Select this component when a ruggedized N-channel JFET with a 40V breakdown voltage is required. The TO-18 package is suitable for applications demanding high thermal stability and radiation hardness. Compare the 40 Ohm on-resistance and 360 mW power dissipation against circuit requirements to ensure adequate performance margins.

Jfets Part Context

This part belongs to the 2N485x series of N-channel JFETs produced by Microchip Technology. The series includes variants such as the 2N4856, 2N4858, and 2N4859, which share similar structural characteristics but differ in voltage ratings and current capabilities. The 2N4857UB represents a specific configuration within this family designed for robust performance.

Jfets Replacement Considerations

The 2N4857 is listed as an equivalent to MIL-PRF-19500/385 devices. Verify compatibility with other parts in the 2N485x series or direct military equivalents before substitution.