LM4121IM5X-1.2

Voltage Reference Overview

The LM4121IM5X-1.2 is a precision micropower low dropout voltage reference manufactured by Texas Instruments, designed for applications requiring stable and accurate voltage regulation in space-constrained environments. This component operates within a supply voltage range of 2.7 V to 14 V, delivering a fixed nominal output voltage of 1.2 V with an initial accuracy of 0.5%. It features a maximum temperature coefficient of 50 ppm/°C over the industrial operating temperature range of -40°C to +85°C. The device draws a typical quiescent current of 100 µA and supports a maximum shunt current of 5 mA. Housed in a compact SOT-23-5 surface-mount package, it ensures reliable performance across various electronic systems.

Voltage Reference Feature Summary

• Provides a fixed 1.2 V output with high precision and stability
• Operates as a low dropout regulator for efficient power management
• Features low temperature coefficient for consistent performance across temperatures
• Designed for micropower applications with minimal quiescent current consumption

Voltage Reference Applications

• Portable battery-powered equipment
• Data acquisition systems
• Microprocessor supervisory circuits
• Battery chargers and power management units

Voltage Reference Procurement Notes

Verify that the ordering suffix matches '1.2' to confirm the fixed 1.2 V output variant. Ensure the package designation corresponds to SOT-23-5 for correct footprint compatibility. Confirm RoHS compliance status if environmental regulations apply to your assembly process. Cross-reference the manufacturer part number with official Texas Instruments documentation to avoid counterfeit components. Check for any specific handling requirements related to electrostatic discharge during storage and installation.

Voltage Reference Selection Notes

Select this component when a precise 1.2 V reference is required in a small form factor. Consider its low quiescent current for battery-operated devices where power efficiency is critical. Evaluate the 0.5% initial accuracy against system tolerance requirements. Verify that the 5 mA load capability meets the downstream circuit demands. Ensure the operating temperature range aligns with the intended application environment.

Voltage Reference Part Context

The LM4121 series belongs to Texas Instruments' family of precision micropower voltage references, offering alternatives to higher-power or less accurate solutions. It complements other fixed-voltage references like the LM4041 and adjustable variants such as the LM4121-ADJ. The SOT-23-5 packaging allows for dense PCB layouts compared to larger through-hole options. This series is widely used in industrial and consumer electronics requiring stable reference voltages.

Voltage Reference Replacement Considerations

LM4121AIM5X-1.2/NOPB: Higher accuracy grade (0.2%) with similar specifications. LM4120IM5X-1.2: Alternative from the same family with comparable performance. LM4041CIM3X-1.2/NOPB: Shunt reference alternative in SOT-23-3 package.