LS844 TO-78 6L ROHS

Overview

The LS844 TO-78 6L ROHS is a low-noise, monolithic dual N-channel JFET amplifier manufactured by Linear Integrated Systems. It features ultra-low input capacitance and noise characteristics suitable for precision instrumentation. Key electrical parameters include a typical voltage noise of 2.5nV/√Hz at 1kHz, maximum gate leakage current of 15pA, and maximum offset voltage drift of 10µV/ºC over the temperature range. The device offers high common-mode rejection ratio (CMRR) up to 100dB and operates within a junction temperature range of -55°C to +150°C.

Feature Summary

• Ultra-low input capacitance substantially reduces intermodulation distortion in circuit designs.
• Monolithic construction provides tight differential voltage matching and thermal tracking between transistors.
• Low noise profile with nearly zero popcorn noise for high-fidelity signal processing.
• High slew rate and low offset voltage drift ensure improved speed and accuracy.

Applications

• Wideband differential amplifiers
• High-speed comparators
• Impedance converters
• Acoustic sensors and hydrophones

Procurement Notes

Verify that the specific part number matches the required package style and RoHS compliance status. Confirm that the ordering suffix aligns with the manufacturer's standard call-out list. Ensure compatibility with the intended operating temperature range and verify absolute maximum ratings against the application's voltage and current constraints before finalizing procurement.

Selection Notes

Select this component when minimizing input capacitance is critical to reducing intermodulation distortion compared to similar devices like the LSK389. Consider the TO-78 metal can package for applications requiring robust through-hole mounting or specific thermal management. Evaluate the trade-off between slightly higher noise levels versus significantly lower capacitance to determine if it meets the system's sensitivity requirements.

Part Context

The LS844 Series represents an advancement in dual N-channel JFET technology by combining low noise with exceptionally low gate-to-drain capacitance. Unlike previous generations, it utilizes interleaved silicon construction for superior matching. This series serves as a direct replacement for legacy parts in high-performance analog circuits where low capacitance is more vital than marginal noise improvements.

Replacement Considerations

The LS844 TO-78 6L is fit, form, and pin compatible with the LSK389 product in equivalent packages. Designers should account for the difference in gate-to-drain capacitance, which is significantly lower in the LS844, potentially allowing for simpler circuit topologies.