LM385MX-2.5

Overview

The LM385MX-2.5 is a micropower shunt voltage reference IC manufactured by Texas Instruments, housed in an 8-SOIC surface-mount package. It provides a fixed output voltage of 2.5V with an initial accuracy tolerance of ±3%. The device operates within a temperature range of 0°C to 70°C and features a temperature coefficient of 150ppm/°C. Maximum cathode current is 20mA, with a minimum operating current of 20µA. Noise performance is specified at 120µVrms over the 10Hz to 10kHz frequency band. This component is classified as obsolete and no longer in production.

Feature Summary

• Provides a stable 2.5V fixed reference voltage suitable for precision applications
• Designed for micropower operation with low minimum cathode current requirements
• Utilizes a compact 8-SOIC surface-mount package for efficient board space utilization

Applications

• Portable battery-powered instrumentation systems requiring low power consumption
• Data acquisition channels needing precise analog-to-digital conversion references
• Microprocessor-based circuits requiring stable supply monitoring thresholds

Procurement Notes

This specific part number is officially obsolete and discontinued by Texas Instruments. Procurement must focus on verified replacement components or surplus stock from authorized distributors. Verify that substitute parts meet all electrical specifications, including voltage tolerance and temperature coefficients, to ensure circuit compatibility. Check RoHS compliance status of alternatives if environmental regulations apply to the final product assembly.

Selection Notes

Select replacement devices based on matching pinout configurations and identical electrical parameters such as the 2.5V output and ±3% accuracy. Consider packages like SOIC-8 or TSSOP-8 for direct physical integration. Evaluate thermal performance and noise characteristics to maintain system integrity. Ensure the chosen alternative supports the required 0°C to 70°C operating range and maintains similar micropower efficiency for battery-sensitive designs.

Part Context

The LM385 series represents Texas Instruments' line of micropower zener-based voltage references. The MX suffix indicates an 8-SOIC surface-mount package variant. This specific model delivers a fixed 2.5V reference, distinguishing it from adjustable variants. It belongs to a legacy family designed for cost-effective, low-power reference solutions in industrial and consumer electronics before newer high-precision alternatives were introduced.

Replacement Considerations

LM385MX-2.5/NOPB is a confirmed public substitute offering identical functionality with updated manufacturing standards.