LM4051CEM3-1.2+T

Voltage Reference Overview

The LM4051CEM3-1.2+T is a precision micropower shunt voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed reverse breakdown voltage of 1.225V with an initial accuracy grade of C (±0.5%). The device operates within a temperature range of -40°C to +125°C and features a maximum temperature coefficient of 50ppm/°C. Electrical characteristics include a minimum operating current of 60µA, a wideband noise of 20µVRMS (10Hz to 10kHz), and a reverse dynamic impedance of 1.5Ω at 1mA. It utilizes a 3-pin SOT23 surface-mount package.

Voltage Reference Feature Summary

• Laser-trimmed resistors ensure high initial accuracy without requiring external trimming components.
• Inherent stability across any capacitive load eliminates the need for external stabilizing capacitors.
• Low dynamic impedance maintains stable reverse breakdown voltage accuracy over a wide operating current range.

Voltage Reference Applications

• Portable, battery-powered equipment
• Notebook computers
• Cell phones
• Industrial process controls
• Automotive systems

Voltage Reference Procurement Notes

Verify that the specific ordering suffix matches the required package type and accuracy grade. Confirm the manufacturer source is Analog Devices or Maxim Integrated to ensure component authenticity. Check datasheet revisions for updates to electrical specifications or thermal ratings before final procurement decisions.

Voltage Reference Selection Notes

Select this component when a low-cost, space-critical shunt reference is needed. The C-grade offers ±0.5% tolerance suitable for general applications. Ensure the design accounts for the 60µA minimum operating current and 15mA maximum shunt current limits to maintain regulation and prevent damage.

Voltage Reference Part Context

This part belongs to the LM4050/LM4051 family of bandgap voltage references. The LM4051 variant specifically provides the 1.225V output option. The family is designed for space-constrained applications using ultra-small packages like SC70 and SOT23, offering multiple fixed voltage options with varying accuracy grades.

Voltage Reference Replacement Considerations

LM4051BEM3-1.2+T (B-grade, 0.2% accuracy)

Voltage Reference FAQ

Does the LM4051 require an external capacitor for stability?

No, the LM4051 does not require an external stabilizing capacitor and is stable with any capacitive load.

What is the maximum shunt current allowed?

The maximum continuous shunt current is 15mA, though it can tolerate up to 20mA briefly without damage.