LM385LP-2-5

Overview

The LM385LP-2.5 is a micropower shunt voltage reference manufactured by National Semiconductor, now part of Texas Instruments. It provides a nominal output voltage of 2.5V with an initial accuracy of ±1%. The device operates within a current range of 10µA to 20mA and features a low temperature coefficient of 50ppm/°C. It is housed in an 8-pin SOIC surface-mount package and supports operation across the commercial temperature range of 0°C to +70°C.

Feature Summary

• Provides stable 2.5V reference voltage via shunt regulation
• Operates at micropower levels starting from 10µA
• Low temperature coefficient ensures stability over thermal changes
• Compatible with standard surface-mount packaging

Applications

• Precision measurement systems requiring stable voltage references
• Battery-powered instrumentation due to low quiescent current
• Data acquisition circuits for analog-to-digital conversion biasing
• Portable electronic devices needing compact voltage regulation

Procurement Notes

Verify that the specific suffix 'LP' corresponds to the intended SOIC-8 package variant as documented in the official datasheet. Confirm that the '-2.5' designation matches the required 2.5V nominal output. Ensure compliance with RoHS directives if applicable to your manufacturing process. Cross-reference the manufacturer's latest documentation to confirm availability and any potential obsolescence notices associated with the National Semiconductor product line transition.

Selection Notes

Select this component when a fixed 2.5V reference is required rather than the adjustable variants found in the broader LM385 family. Consider the ±1% initial accuracy sufficient for general-purpose applications where tighter tolerances are not critical. Evaluate the 50ppm/°C temperature coefficient against environmental conditions. This part is suitable for designs prioritizing low power consumption and small form factor integration.

Part Context

The LM385 series represents a family of micropower voltage references designed for low-cost, high-performance applications. The LM385LP-2.5 specifically targets the 2.5V segment, offering a middle-ground voltage between the 1.2V and higher voltage references. It serves as a fundamental building block for precision analog circuits, providing a reliable baseline voltage for sensors, amplifiers, and converters in industrial and consumer electronics.

Replacement Considerations

Direct equivalents include the LM285-2.5 and LM185-2.5 for military and commercial grades respectively. Texas Instruments offers the LM385MX/NOPB as a modern replacement in the same SOIC-8 package. Verify pinout compatibility and electrical specifications before substituting.