LS844 SOT-23 6L ROHS

Overview

The LS844 SOT-23 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 5µV/°C. The device offers high common-mode rejection ratio (CMRR) up to 102 dB and operates within a temperature range of -55°C to +150°C.

Feature Summary

• Ultra-low input capacitance substantially reduces intermodulation distortion in signal paths.
• 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 ensure improved operational amplifier speed and accuracy.

Applications

• Wideband differential amplifiers
• High-speed temperature compensated single-ended input amplifiers
• High-speed comparators
• Impedance converters
• Sonobuoys and hydrophones

Procurement Notes

Verify the specific package variant matches the required footprint, as the LS844 series is available in multiple configurations including SOIC 8L, PDIP 8L, TO-71 6L, and TO-78 6L. Confirm RoHS compliance status if environmental regulations apply to the end product. Ensure the ordering suffix aligns with the desired lead frame and packaging type specified in the manufacturer's standard part call-out list.

Selection Notes

Select the LS844 over comparable devices when minimizing input capacitance is critical for reducing intermodulation distortion. Consider this component for applications requiring tight offset voltage matching and low drift over wide temperature ranges. Evaluate the trade-off between its slightly higher noise compared to the LSK389 against its significantly lower gate-to-drain capacitance for simpler circuit designs.

Part Context

The LS844 Series represents an advancement in dual N-channel JFET technology by combining low noise with exceptionally low input capacitance. Unlike traditional dual JFETs that may exhibit higher capacitance values, the LS844 utilizes interleaved transistor design on a single silicon piece. This architecture enhances thermal tracking and matching while maintaining a noise level comparable to industry standards, making it distinct from general-purpose JFETs.

Replacement Considerations

The LS844 is fit, form, and pin-compatible with the LSK389 product in TO-71 6L and SOIC 8L packages. For equivalent single N-channel versions, refer to the LSK189 datasheet. Verify compatibility when substituting into existing designs originally using LSK389 components.

FAQ

How does the LS844 compare to the LSK389 regarding capacitance?

The LS844 features a much lower gate-to-drain capacitance of 4pF compared to the 25pF found in the LSK389, enabling simpler circuit designs with fewer devices.

What is the typical voltage noise specification for the LS844?

The typical voltage noise is 2.5nV/√Hz at 1kHz with a noise bandwidth of 1Hz.

Is the LS844 available in through-hole metal cans?

Yes, the LS844 Series is offered in through-hole metal cans, specifically the TO-71 6L and TO-78 6L packages.