2N4391UBC/TR

Jfets Overview

The Microchip Technology 2N4391UBC/TR is a silicon N-channel Junction Field-Effect Transistor (JFET) designed for low-noise analog applications. It utilizes a hermetically sealed TO-18 metal can package with three pins, ensuring robust performance in demanding environments. The device operates as a voltage-controlled resistor or amplifier, characterized by high input impedance and low distortion. Key electrical specifications include a drain-source breakdown voltage of 25V and a gate-source cutoff voltage ranging from -0.5V to -6V. The component supports a continuous drain current of 10mA and dissipates up to 315mW of power at an ambient temperature of 25°C, making it suitable for precision signal processing circuits.

Jfets Feature Summary

• Hermetically sealed TO-18 metal can construction provides environmental protection and reliability for critical analog circuits.
• Silicon N-channel JFET technology ensures stable operation with high input impedance and low noise characteristics.
• Voltage-controlled resistance capability allows for precise gain control and signal attenuation in linear applications.

Jfets Applications

• Low-noise preamplifiers for audio and instrumentation systems
• Voltage-variable resistors in automatic gain control (AGC) circuits
• Analog switches and multiplexers requiring low leakage current

Jfets Procurement Notes

Verify the specific suffix 'TR' against official Microchip documentation to confirm tape-and-reel packaging status, as standard listings may indicate bulk or tube packaging. Confirm RoHS compliance details directly with the manufacturer, as historical military-grade variants often differ in regulatory status. Ensure the ordering part number matches the exact pinout and electrical grade required for your design to avoid integration errors.

Jfets Selection Notes

Select this component when a hermetically sealed JFET is required for high-reliability analog front ends. Compare the gate-source cutoff voltage range (-0.5V to -6V) against circuit biasing requirements to ensure proper operating point stability. Evaluate the thermal dissipation limits relative to the PCB layout and ambient temperature conditions to maintain safe junction temperatures during continuous operation.

Jfets Part Context

The 2N4391 series represents a classic family of N-channel JFETs widely used in precision analog design. The UBC designation typically refers to the specific case style and pin configuration within the Microchip portfolio. This component bridges legacy military specifications with modern commercial availability, offering consistent performance for replacement in established industrial and aerospace designs.

Jfets Replacement Considerations

Direct replacements include the 2N5457 or 2N5458 for general-purpose low-noise applications, though pinouts and exact electrical parameters must be verified. For hermetically sealed equivalents, consider the J111 or J112 series, ensuring the TO-18 package compatibility and matching breakdown voltages are maintained in the new design.