LM4051BEM3-1.2

Voltage Reference Overview

The LM4051BEM3-1.2/NOPB is a precision micropower shunt voltage reference from Texas Instruments, offering a fixed output of 1.225 V. It features B-grade initial accuracy of ±0.2% and a temperature coefficient of 50 ppm/°C. The device operates within a current range of 60 µA to 12 mA and maintains stability across all capacitive loads without external compensation capacitors. It is housed in a compact SOT-23 package with dimensions of 3.04 mm x 1.4 mm x 1.02 mm. The component supports an operating temperature range from -40°C to +85°C.

Voltage Reference Feature Summary

• Provides stable 1.225 V reference output with B-grade precision
• Operates without external stabilization capacitors under any capacitive load
• Features low dynamic impedance and low output noise for signal integrity
• Designed for space-constrained applications using small SOT-23 packaging

Voltage Reference Applications

• Data acquisition systems requiring precise voltage references
• Battery-powered equipment needing low quiescent current operation
• Portable instruments and test equipment calibration
• Process control loops utilizing shunt regulation

Voltage Reference Procurement Notes

Verify the complete part number includes the NOPB suffix to ensure lead-free compliance and specific manufacturing lot traceability. Confirm the 'B' grade designation matches the required ±0.2% initial accuracy tolerance for your circuit design. Ensure the SOT-23-3 package footprint aligns with your PCB layout constraints. Check the industrial temperature rating (-40°C to +85°C) against your environmental operating conditions before finalizing procurement.

Voltage Reference Selection Notes

Select this component when a fixed 1.225 V reference is required with high precision in a minimal footprint. The B-grade variant offers a balance between cost and performance compared to A-grade options. Consider the 60 µA minimum operating current to ensure proper biasing in low-power designs. This shunt reference is suitable where external capacitor usage must be avoided to save board space or reduce component count.

Voltage Reference Part Context

This device belongs to the LM4051-N series of precision micropower shunt voltage references. It shares architectural similarities with the LM4041 series but offers improved accuracy grades and lower temperature coefficients. The LM4051 family is designed to replace older discrete zener-based references, providing superior long-term stability and noise performance in compact surface-mount packages.

Voltage Reference Replacement Considerations

LM4041BIM3-1.2/NOPB: Offers similar functionality but with different accuracy grades and potentially wider temperature ranges.