LM4125IM5-2.5/NOPB

Voltage Reference Overview

The LM4125IM5-2.5/NOPB is a micropower shunt voltage reference manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed output voltage of 2.5V with an initial accuracy of ±0.5%. The device operates within an input voltage range of 2V to 12V and draws a typical supply current of 275µA. It features a temperature coefficient of 50ppm/°C and low noise characteristics, specified at 20µVp-p in the 0.1Hz to 10Hz band. The component is housed in a SC-74A (SOT-753) surface-mount package and is rated for operation over an extended temperature range of -40°C to +85°C.

Voltage Reference Feature Summary

• Provides a stable 2.5V reference voltage with high initial precision.
• Designed for ultra-low power consumption suitable for battery-operated systems.
• Offers low noise performance for sensitive analog signal conditioning applications.

Voltage Reference Applications

• Portable instrumentation requiring precise voltage references
• Battery-powered measurement devices
• Analog-to-digital converter reference sources

Voltage Reference Procurement Notes

Verify that the ordering suffix /NOPB confirms lead-free and RoHS compliance status as per the manufacturer's latest documentation. Confirm the specific package marking and date code alignment with your assembly requirements. Ensure the supplier provides valid traceability documents. Cross-reference the manufacturer part number with current Texas Instruments listings, as National Semiconductor branding may be legacy. Validate the operating temperature range specifications against your environmental constraints before finalizing procurement.

Voltage Reference Selection Notes

Select this component when a fixed 2.5V reference is required with minimal quiescent current draw. The ±0.5% initial accuracy makes it suitable for general-purpose precision applications. Consider the SOT-753 package for space-constrained PCB layouts. Evaluate the 50ppm/°C temperature coefficient against your system's thermal stability needs. This device is appropriate where low noise is critical but extreme precision or higher current drive is not necessary.

Voltage Reference Part Context

This component belongs to the LM412x series of micropower shunt voltage references. These devices are designed to replace Zener diodes in many applications, offering superior temperature stability and lower noise. The series typically includes various fixed voltage options and different accuracy grades. The LM4125 specifically targets the 2.5V output segment, providing a compact solution for reference voltage generation in modern electronic circuits.

Voltage Reference Replacement Considerations

Direct substitutes include other LM4125 variants with different accuracy grades or packages, such as LM4125AIM5-2.5. Verify pinout compatibility and electrical parameter overlaps before substitution. Check for updated manufacturer part numbers under the Texas Instruments portfolio.