LF398M

Overview

The LF398M is a monolithic sample-and-hold circuit manufactured by National Semiconductor. It integrates a high-performance FET-input operational amplifier, a precision buffer amplifier, and a low-leakage analog switch on a single chip. The device is designed for applications requiring fast acquisition times and low droop rates in signal processing systems.

Feature Summary

• Integrates FET-input op amp, buffer, and analog switch
• Designed for low droop and fast acquisition
• Monolithic construction for reliability

Applications

• Analog-to-digital converter front ends
• Peak detection circuits
• Pulse width modulation systems

Procurement Notes

Verify the manufacturer designation as National Semiconductor or Texas Instruments, as TI acquired NS. Confirm the suffix 'M' indicates the plastic DIP package variant. Ensure RoHS compliance status matches current inventory requirements if applicable.

Selection Notes

Select this component when a dedicated sample-and-hold function is required without external discrete switching components. Consider the acquisition time and aperture delay specifications relative to the input signal frequency. Evaluate power supply voltage ranges against system constraints.

Part Context

This part belongs to the LFx98x family of monolithic sample-and-hold circuits. It serves as a foundational building block for data acquisition systems where precise voltage sampling is critical before digitization.

Replacement Considerations

Check for LF398MX/NOPB or LF398M/NOPB equivalents which may offer updated manufacturing processes or packaging options while maintaining functional compatibility.