LM329DZ#PBF

Overview

The LM329DZ#PBF is a temperature-compensated 6.9V Zener voltage reference in a 3-lead plastic TO-92 package. It provides excellent stability over time and temperature with very low dynamic impedance and wide operating current range from 0.6mA to 15mA. The device achieves low noise using a buried Zener design. Key electrical specifications include a guaranteed maximum temperature coefficient of 10ppm/°C, a maximum dynamic impedance of 1Ω at 1mA, and a maximum wideband RMS noise of 20µV (10Hz to 10kHz). The reverse-breakdown voltage ranges from 6.6V to 7.25V.

Feature Summary

• Temperature compensated 6.9V Zener reference providing excellent long-term and thermal stability
• Low dynamic impedance achieved through an internal high gain shunt regulator architecture
• Buried Zener design eliminates surface noise for superior noise performance
• Wide operating current range supporting diverse application requirements

Applications

• Transducers
• A/D and D/A Converters
• Calibration Standards
• Instrumentation Reference

Procurement Notes

Verify the specific grade suffix 'D' corresponds to the required 10ppm/°C temperature coefficient specification before procurement. Confirm that the TO-92 package style meets the mechanical constraints of the target PCB layout. Ensure the operating current remains within the 0.6mA to 15mA range to maintain specified accuracy and stability parameters.

Selection Notes

Select this component when a stable 6.9V reference is needed with strict limits on temperature drift and noise. The TO-92 package is suitable for through-hole mounting where space allows. Compare against other grades if tighter temperature coefficients or different voltage outputs are required. Consider the power dissipation capabilities relative to the maximum operating current and ambient temperature conditions.

Part Context

The LM329 is part of the LM129/LM329 family of precision voltage references manufactured by Analog Devices (formerly Linear Technology). This family includes various temperature grades and package options such as the TO-46 metal can and TO-92 plastic. The LM329 series is specifically designed for commercial temperature ranges, unlike the LM129 which covers military temperatures.

Replacement Considerations

LM329DH#PBF

FAQ

What is the maximum wideband noise specification for the LM329DZ#PBF?

The maximum wideband RMS noise is 20µV measured between 10Hz and 10kHz.

How does the LM329 achieve its low noise performance?

It utilizes a buried Zener design which eliminates the surface noise phenomenon associated with ordinary Zener diodes.