LM385M-2.5

Overview

The LM385M-2.5 is a micropower shunt voltage reference integrated circuit manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed 2.5V output with an initial accuracy tolerance of ±3%. The device operates within a cathode current range of 20 µA to 20 mA and features a temperature coefficient of 150 ppm/°C. It is housed in an 8-SOIC surface-mount package and supports a commercial operating temperature range of 0°C to 70°C.

Feature Summary

• Provides a stable 2.5V fixed reference voltage using bandgap technology
• Operates efficiently with low quiescent current suitable for battery-powered systems
• Designed for surface-mount assembly in compact electronic circuits

Applications

• Precision analog-to-digital converter (ADC) reference sources
• Battery-powered instrumentation requiring low power consumption
• Temperature sensor interface circuits for cold junction compensation

Procurement Notes

Verify component authenticity as the LM385M-2.5 is listed as obsolete or end-of-life. Confirm RoHS compliance status, as original versions may not meet current environmental standards. Check for available lead-free alternatives such as the NOPB suffix variants from Texas Instruments to ensure supply chain continuity and regulatory adherence for new designs.

Selection Notes

Select this component when a fixed 2.5V reference is required in an 8-pin SOIC package. Ensure the application current remains between 20 µA and 20 mA for proper regulation. Consider the 150 ppm/°C temperature coefficient for thermal stability requirements. Verify that the ±3% initial accuracy meets the system's precision needs compared to tighter tolerance options.

Part Context

This device belongs to the LM185/LM285/LM385 family of micropower voltage references. The 'LM' prefix typically denotes the commercial temperature grade variant. These references utilize bandgap principles to maintain voltage stability across varying load and temperature conditions, serving as foundational components in precision measurement and control electronics.

Replacement Considerations

Public confirmed substitute part numbers include LM385MX-2.5/NOPB and LM385MX/NOPB from Texas Instruments.