ADR1399KHZ

Overview

The ADR1399KHZ is an oven-compensated, buried zener voltage reference providing a nominal output of 7.05 V in a 4-lead TO-46 package. It features a temperature coefficient of 0.2 ppm/°C and operates within a 0°C to +70°C range. The device specifies initial accuracy between –300 mV and +250 mV, with dynamic impedance ranging from 0.04 Ω to 0.08 Ω. Quiescent current is typically 3 mA, while heater supply current varies from 8.5 mA to 281 mA depending on ambient conditions.

Feature Summary

• Integrates a temperature stabilizing loop with an active buried zener diode on a monolithic substrate to eliminate voltage changes with temperature.
• Provides low dynamic impedance to reduce the effects of shunt resistor drift and supply voltage variations on the reference output.
• Includes an external thermal insulator for the TO-46 package to minimize heat loss and maintain stable operating temperatures.

Applications

• Precision voltage reference for multimeters
• Calibration equipment voltage standards
• Laboratory measurement equipment
• Industrial monitor and control instrumentation
• Ultrastable data converters

Procurement Notes

Verify that the specific part number suffix KHZ corresponds to the RoHS compliant version as indicated in the ordering guide. Confirm the package option matches the required 4-Lead TO-46 configuration. Ensure the application environment stays within the specified 0°C to +70°C operating temperature range to maintain guaranteed performance specifications.

Selection Notes

Select this component when ultra-low temperature drift and high stability are critical requirements. The TO-46 package requires careful PCB thermal design, including lead elevation and ground plane hatching, to maximize thermal resistance. Consider the LCC variant if surface-mount technology or force/sense pin configurations are needed for lower dynamic impedance applications.

Part Context

The ADR1399 series serves as a precision shunt reference upgrade path for legacy LM399 designs. It combines a subsurface zener circuit with internal servo loops to maintain a die temperature of approximately 95°C. This ovenized approach ensures excellent long-term stability and minimal noise compared to standard bandgap references.

Replacement Considerations

ADR1399KEZ