LM329AHLT

Overview

The LM329AHLT is a shunt precision voltage reference manufactured by Analog Devices Inc., featuring a nominal output of 6.9V. It utilizes buried zener technology to achieve high stability and low noise characteristics suitable for demanding analog applications. The device operates within a temperature range of -55°C to +125°C, ensuring reliable performance in industrial environments. Key electrical specifications include a maximum input voltage of 40V and a typical temperature coefficient of 30 PPM/°C. It requires a minimum operating current of 600 µA and can handle a maximum shunt current of 15 mA. The component is housed in an 8-lead SOIC surface-mount package.

Feature Summary

• Buried zener architecture provides superior long-term stability and low noise compared to standard bandgap references.
• Wide operating temperature range supports deployment in harsh industrial and automotive conditions.
• High input voltage capability allows direct connection to higher supply rails without additional regulation.

Applications

• Precision data acquisition systems requiring stable reference voltages
• Industrial process control instrumentation
• Automotive electronic measurement circuits

Procurement Notes

Verify the specific suffix 'AHL' against the official Analog Devices datasheet to confirm the exact grade, temperature range, and packaging configuration. Ensure compatibility with existing PCB footprints for the 8-lead SOIC package. Confirm RoHS compliance status through the manufacturer's latest documentation before finalizing procurement plans.

Selection Notes

Select this component when high accuracy and low drift are critical over a wide temperature span. Compare the 6.9V output against system requirements to ensure proper biasing. Evaluate the thermal management needs given the power dissipation at maximum shunt currents. Consider the surface-mount form factor for automated assembly processes.

Part Context

The LM329 series represents a family of precision voltage references known for their robustness and accuracy. The LM329AHLT variant specifically targets applications requiring extended temperature ranges and surface-mount integration. It serves as a critical reference element in analog signal chains where noise and drift must be minimized.

Replacement Considerations

Cross-reference with LM329 variants from other manufacturers such as Texas Instruments or Linear Technology for pin-compatible alternatives. Verify that substitute parts meet the same 6.9V nominal output and temperature coefficient specifications. Check for any differences in package dimensions or thermal characteristics.