LS3954 TO-71 6L

Overview

The LS3954 is a monolithic dual N-channel JFET amplifier designed for low noise and low drift applications. It features a maximum gate leakage of 20 pA typical, a voltage noise density of 10 nV/√Hz typical, and a transconductance of 700 µS typical at 200 µA drain current. The device operates with a gate-to-source breakdown voltage of 60 V and supports an operating junction temperature range from -55°C to +150°C. Available in TO-71, TO-78, and SOIC packages, it provides high common-mode rejection ratios exceeding 100 dB.

Feature Summary

• Monolithic dual N-channel JFET architecture optimized for precision analog signal processing
• Ultra-low input bias current and minimal gate leakage characteristics
• High common-mode rejection ratio suitable for differential amplification
• Extended operating temperature range supporting harsh environment reliability

Applications

• Precision instrumentation amplifiers requiring low offset drift
• Low-noise preamplifier stages for sensor interfaces
• High-impedance buffer circuits in measurement systems
• Chopper-stabilized amplifier front ends

Procurement Notes

Verify the specific suffix code against the manufacturer's datasheet to confirm the exact performance grade (e.g., LS3954 vs LS3954A). Confirm package availability matches the required footprint, as options include TO-71, TO-78, and SOIC. Ensure supply chain sources provide original manufacturer documentation to validate electrical parameters such as leakage current and transconductance before integration into critical designs.

Selection Notes

Select the LS3954 when low input bias current and high input impedance are critical requirements. Choose higher grades like LS3954A if tighter voltage offset and drift specifications are necessary for the application. Consider the TO-71 or TO-78 packages for hermetic sealing in military or aerospace contexts, while SOIC may be preferred for standard surface-mount assembly processes.

Part Context

Linear Integrated Systems specializes in high-performance discrete semiconductors utilizing proprietary processes derived from expertise at Amelco, Union Carbide, Intersil, and Micro Power Systems. The LS3954 belongs to a family of matched dual JFETs that includes variants with varying offset and drift specifications, catering to diverse precision analog design needs.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.