LF398H/NOPB

Overview

The LF398H/NOPB is a monolithic sample and hold amplifier manufactured by Texas Instruments. It utilizes BI-FET technology to provide high-speed analog signal processing within a single integrated circuit. The device operates on a single supply voltage ranging from 5 V to 18 V, supporting both positive and negative power rails for flexible system integration. It features a capture time of 20 µs, ensuring accurate signal acquisition during the sampling phase. The component is designed for through-hole mounting in an 8-pin TO-99 metal can package, suitable for industrial environments operating between 0°C and +70°C.

Feature Summary

• Monolithic integration of sample and hold functions using BI-FET technology
• Single-supply operation capability with wide voltage range support
• Through-hole compatible metal can packaging for robust mechanical stability

Applications

• Data acquisition systems requiring precise analog signal freezing
• Frequency-to-voltage conversion circuits utilizing sample-and-hold techniques
• Analog multiplexing interfaces preceding analog-to-digital conversion stages

Procurement Notes

Verify the specific suffix H indicates the military-grade or enhanced temperature variant compared to standard commercial versions. Confirm the TO-99-8 package dimensions match your PCB footprint requirements. Ensure the supplier provides original manufacturer documentation to validate authenticity. Check RoHS compliance status as indicated in official specifications before finalizing procurement orders.

Selection Notes

Select this component when a through-hole metal can package is required for sample and hold applications. Consider the 20 µs capture time against system timing constraints. Evaluate the BI-FET input stage for low bias current needs. Compare performance metrics with other LF398 variants if surface-mount options are acceptable for the design.

Part Context

This part belongs to the LF398 family of sample and hold amplifiers produced by Texas Instruments. The family includes various packages such as PDIP and SOIC, with the H suffix typically denoting a specific environmental or reliability grade. These devices are commonly used in instrumentation and control systems where accurate temporal sampling of analog signals is critical for subsequent digital processing.

Replacement Considerations

LF398N/NOPB offers similar functionality in a PDIP-8 package with a faster 4 µs capture time. LF398MX/NOPB provides the same core function in an SOIC-14 surface-mount package. Verify pin compatibility and thermal characteristics when substituting these alternatives.