LM385BM-2.5/NOPB

Overview

The LM385BM-2.5/NOPB is a micropower shunt voltage reference diode manufactured by Texas Instruments, which acquired National Semiconductor. It provides a fixed 2.5V output with an initial accuracy of 1% and a temperature coefficient of 100 ppm/°C. The device operates within a cathode current range of 10 µA to 20 mA and functions across a commercial temperature range of 0°C to 70°C. Housed in an 8-SOIC package, it serves as a low-cost precision reference for analog circuits.

Feature Summary

• Provides stable 2.5V reference voltage via shunt regulation
• Micropower operation suitable for battery-powered applications
• High initial accuracy ensures precise circuit performance
• Low temperature coefficient maintains stability over operating range

Applications

• Portable instrumentation requiring low power consumption
• Battery-operated measurement systems
• Data acquisition systems needing stable voltage references
• Analog-to-digital converter reference inputs

Procurement Notes

Verify the manufacturer designation carefully, as the component is produced by Texas Instruments following their acquisition of National Semiconductor. Confirm the suffix /NOPB indicates lead-free and RoHS compliance. Ensure the specific grade (B) matches the required accuracy specifications for your design. Cross-reference datasheets to confirm pinout compatibility if replacing older National Semiconductor stock.

Selection Notes

Select this component when a fixed 2.5V reference is required with high initial accuracy and low quiescent current. It is suitable for designs where space is limited due to the SOIC package. Consider the 100 ppm/°C temperature coefficient against environmental conditions. Compare with adjustable variants if flexible voltage settings are needed instead of a fixed output.

Part Context

This part belongs to the LM185/LM285/LM385 family of micropower voltage references. The 'LM' prefix typically denotes the commercial temperature grade. The 'B' suffix specifies the tighter 1% accuracy bin compared to standard grades. The '/NOPB' suffix confirms the absence of halogenated substances and compliance with environmental directives.

Replacement Considerations

Direct replacements include LM385BM-2.5 without the NOPB suffix for non-RoHS requirements. Other compatible parts from the same family include LM285BM-2.5 for extended temperature ranges or LM185BM-2.5 for military-grade environments. Verify pinout and thermal characteristics before substituting.