LM4051CIX3-1.2+

Voltage Reference Overview

The LM4051CIX3-1.2+ is a precision two-terminal shunt voltage reference manufactured by Analog Devices Inc./Maxim Integrated. It provides a fixed reverse breakdown voltage of 1.225V with an initial accuracy of ±0.5% (Grade C). The device features a maximum temperature coefficient of 50ppm/°C guaranteed over the -40°C to +125°C extended temperature range. It operates within a wide current range of 60µA to 15mA and exhibits low output noise of 28µVRMS from 10Hz to 10kHz. Packaged in a subminiature 3-pin SC-70 surface-mount package measuring 1.8mm x 1.8mm, it requires no external output capacitors and tolerates capacitive loads.

Voltage Reference Feature Summary

• Ultra-small 3-pin SC-70 surface-mount package for space-critical applications
• No output capacitors required while maintaining stability under any capacitive load
• Precision bandgap design with 50ppm/°C maximum temperature coefficient

Voltage Reference Applications

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

Voltage Reference Procurement Notes

Verify that the specific suffix 'CIX3' corresponds to the Grade C accuracy variant and the SC-70 package type as documented in the official Maxim Integrated datasheet. Confirm the '+T' or tape-and-reel status if automated assembly is required. Ensure the ordering information matches the exact manufacturer part number to distinguish between different accuracy grades and package options available within the LM4051 family.

Voltage Reference Selection Notes

Select this component when a fixed 1.225V reference is needed in a compact footprint. The Grade C accuracy suits applications where ±0.5% tolerance is acceptable. Consider the 60µA minimum operating current for battery life optimization. Verify that the 15mA maximum current capability meets the load requirements. The extended temperature range supports operation in harsh environments without additional thermal management.

Voltage Reference Part Context

This device belongs to the LM4050/LM4051 series of precision micropower shunt voltage references. The series offers multiple fixed voltage options including 1.225V, 2.048V, 2.500V, 3.000V, 3.3V, 4.096V, and 5.000V. The LM4051 specifically denotes the 1.225V version. The series is designed to replace larger SOT-23 packages with a 50% smaller SC-70 form factor while maintaining similar electrical performance characteristics.

Voltage Reference Replacement Considerations

LM4051BIX3-1.2+ offers higher Grade B accuracy (±0.2%). LM4051AIX3-1.2+ provides Grade A accuracy (±0.1%). LM4050 variants offer different fixed voltages such as 2.5V or 3.3V. SOT-23 packaged versions like LM4051CIM3-1.2 are physically larger but electrically comparable.