U440 TO-71 6L ROHS

Overview

The U440 is a monolithic dual N-channel silicon JFET housed in a hermetically sealed TO-71 package. It features two tightly matched transistors on a single chip to minimize parasitics and ensure high-frequency performance. The device serves as a direct replacement for the discontinued Siliconix U440, offering superior matching characteristics suitable for demanding test and measurement applications.

Feature Summary

• Monolithic dual design reduces parasitic effects for improved high-frequency operation
• Tightly matched transistor pairs ensure precise differential performance
• Hermetically sealed TO-71 construction supports military-grade reliability

Applications

• Wideband differential amplifiers
• High-speed temperature-compensated single-ended input amplifiers
• High-speed comparators
• Impedance converters
• Vibration detectors

Procurement Notes

Verify that the specific unit acquired is manufactured by Linear Integrated Systems, Inc., as the datasheet explicitly identifies this entity as the current producer replacing the original Siliconix version. Confirm the package matches the standard TO-71 configuration with six pins. Ensure the component meets the required hermetic sealing specifications if intended for military or harsh environment deployment.

Selection Notes

Select this component when tight matching between two N-channel JFETs is critical for circuit accuracy. The monolithic architecture is preferred over discrete paired devices for applications requiring minimal parasitic capacitance at very high frequencies. Consider the TO-71 package constraints regarding board space and thermal dissipation capabilities during the initial design phase.

Part Context

This component belongs to the family of small-signal junction field-effect transistors designed for analog signal processing. It replaces legacy parts from Siliconix, maintaining functional compatibility while being produced by Linear Integrated Systems, Inc. The device is categorized under discrete semiconductors and transistors, specifically tailored for precision analog circuits rather than digital switching.

Replacement Considerations

The U440 is documented as a direct replacement for the discontinued Siliconix U440. Verify pinout compatibility and electrical parameter tolerances against the original Siliconix datasheet to ensure seamless integration into existing designs without modification.