LF298M-NS

Overview

The LF298M-NS is a monolithic sample-and-hold circuit manufactured by National Semiconductor. It integrates a single functional unit designed for precise signal acquisition and storage in analog processing systems. The device features an acquisition time of 20 µs, a bandwidth of 1 MHz, and an input offset voltage of 1 mV. It is housed in a 14-pin SOIC package and contains one internal amplifier. This component serves as a dedicated solution for maintaining sampled voltage levels with minimal droop and aperture uncertainty.

Feature Summary

• Monolithic integration of sample-and-hold functionality within a single compact package
• Designed for high-speed signal acquisition with specified bandwidth capabilities
• Includes internal amplification to support accurate voltage tracking during the hold phase

Applications

• Analog-to-digital converter front-end conditioning
• Precision data acquisition systems requiring signal freezing
• Waveform sampling circuits in instrumentation

Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Ensure the part number suffix matches the required package type and temperature grade. Confirm that the specific revision aligns with current design requirements, as legacy components may have updated equivalents or pin-compatible alternatives available from the successor manufacturer.

Selection Notes

Select this component when a dedicated, single-channel sample-and-hold function is required without external discrete components. Consider the 20 µs acquisition time and 1 MHz bandwidth against system speed requirements. Evaluate the 14-pin SOIC package constraints for PCB layout. Verify compatibility with input signal ranges and output drive capabilities before finalizing the design.

Part Context

The LF298 series belongs to a family of monolithic sample-and-hold circuits originally developed by National Semiconductor. These devices were widely used in analog signal processing applications before being integrated into Texas Instruments' portfolio following the acquisition. The LF298M variant represents a specific military or enhanced grade version within this lineage, distinguished by its robust construction and performance specifications.

Replacement Considerations

The LF398M/NOPB is identified as a comparable alternative within the same product family. Verify pinout compatibility and electrical parameter alignment before substitution. Check for any differences in acquisition time or droop rate that might impact system performance.