LM4040B20IDCKR

Overview

The LM4040B20IDCKR is a precision micropower shunt voltage reference manufactured by Texas Instruments. It provides a fixed output voltage of 2.048 V with an initial accuracy of ±0.2%. The device operates within a temperature range of -40°C to +85°C and features a low temperature coefficient of 100 ppm/°C. Packaged in a compact SC-70-5 (SOT-353) surface-mount case, it supports a maximum cathode current of 15 mA and requires a minimum operating current of approximately 88 µA. This component is designed for applications requiring high stability and low power consumption.

Feature Summary

• Provides a stable fixed reference voltage of 2.048 V with high initial accuracy.
• Operates efficiently at micropower levels with low minimum operating current.
• Maintains performance stability across industrial temperature ranges.

Applications

• Precision analog-to-digital converter (ADC) reference inputs
• Digital-to-analog converter (DAC) voltage references
• Battery-powered measurement systems requiring low quiescent current

Procurement Notes

Verify the specific suffix IDCKR confirms the SC-70-5 package and tape-and-reel delivery format. Confirm the B-grade designation corresponds to the required ±0.2% initial accuracy specification. Ensure the operating environment remains within the -40°C to +85°C commercial temperature range defined for this variant. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component when a 2.048 V reference is required in a small surface-mount footprint. The ±0.2% accuracy suits applications needing tighter tolerance than standard 1% devices. Consider the 100 ppm/°C temperature coefficient for environments with moderate thermal fluctuations. Ensure the circuit design can accommodate the minimum cathode current requirement to maintain regulation.

Part Context

This part belongs to the LM4040 family of micropower shunt voltage references from Texas Instruments. The series offers various fixed voltage options and accuracy grades. The LM4040B20IDCKR specifically targets cost-sensitive applications requiring better precision than the D-grade parts while maintaining low power consumption. It serves as a drop-in replacement for older discrete zener diode references in many designs.

Replacement Considerations

LM4040B20IDCKRG4 is a lead-free version with identical electrical specifications. LM4040D20IDCKR offers lower accuracy (±1%) but may be available in different supply configurations. Verify pinout compatibility when substituting with other SC-70-5 voltage references.