LM4051AEM3X-1.2/NOPB

Voltage Reference Overview

The LM4051AEM3X-1.2/NOPB is a micropower shunt voltage reference manufactured by Texas Instruments, housed in an SOT-23-3 surface-mount package. It provides a fixed output voltage of 1.225 V with an initial accuracy of 0.1% and a temperature coefficient of 50 ppm/°C. The device operates within a junction temperature range of -40°C to +125°C and supports a maximum cathode current of 12 mA. Designed for precision applications, it features low noise characteristics suitable for sensitive analog circuits.

Voltage Reference Feature Summary

• Micropower operation with low quiescent current consumption
• High precision fixed output voltage with tight initial accuracy tolerance
• Low temperature coefficient ensuring stable performance across wide thermal ranges
• Compact SOT-23-3 surface-mount packaging for space-constrained designs

Voltage Reference Applications

• Portable battery-powered instrumentation requiring low power consumption
• Precision data acquisition systems and sensor signal conditioning
• Reference voltage sources for analog-to-digital converters (ADCs)
• Medical equipment and handheld diagnostic devices

Voltage Reference Procurement Notes

Verify the complete part number including the suffix /NOPB to ensure lead-free compliance and specific manufacturing lot details. Confirm the package type matches your PCB footprint requirements. Check for automotive qualification if operating in harsh environments, as standard versions may differ from Q-grade equivalents. Ensure supply chain authenticity through authorized distributors.

Voltage Reference Selection Notes

Select this component when a fixed 1.225 V reference with high accuracy is required in a small form factor. Compare against adjustable variants if circuit flexibility is needed. Consider the LM4050 series for higher voltage outputs or different accuracy grades. Evaluate power budget constraints against the 12 mA maximum cathode current capability.

Voltage Reference Part Context

This device belongs to the LM4051 family of micropower shunt voltage references from Texas Instruments. The family offers various fixed voltage options and adjustable configurations in compact packages. It serves as a cost-effective solution for precision reference applications where power efficiency and board space are critical design parameters.

Voltage Reference Replacement Considerations

Direct substitutes include other LM4051 variants with different fixed voltages or the LM4050 series for similar performance profiles. Verify pin compatibility and electrical specifications before substitution. Automotive applications may require AEC-Q100 qualified parts such as the TL4051 series.