LM4121IM5-1.2

Voltage Reference Overview

The LM4121IM5-1.2 is a precision micropower low dropout voltage reference manufactured by Texas Instruments. It provides a fixed output voltage of 1.2V with an initial accuracy of 0.5% and a temperature coefficient of 150 ppm/°C. The device operates within a supply voltage range of 2.7V to 14V, drawing a maximum shunt current of 5mA. It features rail-to-rail input/output capability and is housed in a compact SOT-23-5 package. The component supports operation from -40°C to +85°C, ensuring stability in various environmental conditions.

Voltage Reference Feature Summary

• Precision micropower series voltage reference design
• Low dropout operation for efficient power management
• Compact surface-mount packaging for space-constrained applications

Voltage Reference Applications

• Portable battery-powered instrumentation
• Data acquisition systems requiring stable reference voltages
• Microcontroller analog-to-digital converter references

Voltage Reference Procurement Notes

Verify the specific suffix and marking on the component body to confirm the 1.2V fixed output variant. Ensure the ordering part number matches the required tolerance and temperature grade specifications. Cross-reference the manufacturer datasheet for pinout compatibility and thermal dissipation requirements before integration into the final design.

Voltage Reference Selection Notes

Select this component when a stable, low-power reference is needed for low-voltage circuits. The 1.2V output is suitable for single-supply ADCs and DACs. Consider the 0.5% initial accuracy and 150 ppm/°C drift for precision requirements. The SOT-23-5 package offers a small footprint compared to larger through-hole alternatives.

Voltage Reference Part Context

The LM4121 belongs to Texas Instruments' family of precision micropower voltage references. It complements other devices like the LM4120 and LM4130, offering adjustable or fixed voltage options. This series is designed for applications where power consumption must be minimized while maintaining high accuracy and stability over temperature variations.

Voltage Reference Replacement Considerations

LM4121AIM5X-1.2/NOPB: Higher accuracy variant (0.2%) with identical pinout and function.