LM4040A82IDCKR

Overview

The LM4040A82IDCKR is a precision micropower shunt voltage reference manufactured by Texas Instruments. It provides a fixed output voltage of 8.192V with an initial accuracy of ±0.1% and a maximum temperature coefficient of 100ppm/°C. The device operates within a free-air temperature range of -40°C to 85°C and requires a minimum cathode current of 45μA typical. It features low dynamic impedance, low noise (35μVRMS typical), and remains stable with all capacitive loads without requiring an external output capacitor.

Feature Summary

• Offers high-precision fixed output voltage with tight tolerance and low temperature drift for accurate reference applications.
• Designed for micropower operation with a very low minimum operating current suitable for battery-powered systems.
• Maintains stability across all capacitive load conditions without the need for additional series isolation components.

Applications

• Data-acquisition systems
• Energy infrastructure monitoring
• Analog input modules
• Field transmitters

Procurement Notes

Verify the specific suffix 'DCKR' corresponds to the SC-70-5 package and tape-and-reel quantity configuration before ordering. Confirm that the A-grade specifications meet the required accuracy thresholds for the target circuit design. Ensure the supply voltage exceeds the reference voltage to maintain proper shunt regulation during operation.

Selection Notes

Select this component when a high-accuracy 8.192V reference is required in a compact surface-mount footprint. The A-grade classification ensures minimal deviation from the nominal voltage. Consider the SC-70-5 package dimensions if board space is constrained. Verify that the application environment stays within the specified industrial temperature limits.

Part Context

This part belongs to the LM4040 family of micropower shunt voltage references. The 'A' designation indicates the highest accuracy grade available in the series. The '82' code specifies the 8.192V output voltage option. The 'I' suffix denotes the industrial temperature range variant, distinguishing it from extended temperature or automotive qualified versions.

Replacement Considerations

LM4040B82IDCKR offers similar functionality with slightly relaxed accuracy specifications.

FAQ

Does the LM4040A82IDCKR require an output capacitor for stability?

No, the device is designed to be stable with all capacitive loads and does not require an external output capacitor.

What is the minimum current required for proper regulation?

The device typically requires a minimum cathode current of 45μA to maintain regulation.