LF198H

Special Purpose Amplifiers Overview

The LF198H is a monolithic sample-and-hold amplifier manufactured by Texas Instruments, originally developed under the National Semiconductor brand. It utilizes BI-FET technology to provide high-speed acquisition and low droop rates for precision analog signal processing. The device is housed in an 8-lead TO-99 metal can package designed for through-hole mounting. It accepts analog input signals and functions as a dedicated sample and hold amplifier within the LF198 series. The component operates across a specified temperature range suitable for industrial applications.

Special Purpose Amplifiers Feature Summary

• Monolithic integration of sample-and-hold circuitry on a single chip
• BI-FET input stage for high-speed performance and low bias current
• Precision analog signal capture with minimal aperture delay
• Robust metal can packaging for reliable thermal and mechanical stability

Special Purpose Amplifiers Applications

• Data acquisition systems requiring precise signal sampling
• Analog-to-digital converter front-end conditioning
• High-speed waveform digitization circuits
• Instrumentation amplifiers with holding capabilities

Special Purpose Amplifiers Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor assets are now managed by Texas Instruments. Confirm the specific suffix (e.g., NOPB) indicates lead-free compliance and RoHS status. Ensure the TO-99-8 package matches your PCB footprint requirements. Check for process change notifications that may affect pin compatibility or electrical characteristics compared to legacy versions.

Special Purpose Amplifiers Selection Notes

Select this component when high-speed acquisition and low droop are critical for maintaining signal integrity during conversion cycles. Consider the BI-FET technology benefits over standard bipolar inputs for reduced bias current errors. Evaluate the TO-99 package constraints against available board space and mounting methods. Compare performance metrics with other LF198 variants if different temperature grades or packaging options are required.

Special Purpose Amplifiers Part Context

The LF198H belongs to the LF198 family of monolithic sample-and-hold amplifiers. This series is known for combining high speed with precision, making it suitable for demanding analog applications. The H variant typically denotes a specific performance grade or package style within the broader product line. These components are widely used in professional audio, medical imaging, and industrial control systems where accurate temporal sampling is essential.

Special Purpose Amplifiers Replacement Considerations

The LF398 is a common functional substitute within the same family, often offering similar pinouts and performance characteristics. Verify electrical parameters such as aperture delay and droop rate to ensure compatibility with existing circuit designs. Check for any differences in package dimensions or thermal handling between the LF198H and potential replacement parts.