LM285AXM-1.2

Overview

The LM285AXM-1.2 is a fixed shunt voltage reference diode from the LM285 series, manufactured by National Semiconductor (now Texas Instruments). It provides a nominal output voltage of 1.25 V with an initial tolerance of 1%. The device operates within a temperature range of -40°C to 85°C and is housed in an SOIC-8 surface-mount package.

Feature Summary

• Provides a stable fixed reference voltage for precision analog circuits
• Operates as a shunt regulator requiring only a single current-limiting resistor
• Designed for low-power applications with minimal quiescent current consumption

Applications

• Precision analog-to-digital converter (ADC) reference sources
• Digital-to-analog converter (DAC) voltage references
• Battery-powered instrumentation circuits

Procurement Notes

Verify the manufacturer designation on the datasheet, as National Semiconductor assets were acquired by Texas Instruments. Confirm that the specific suffix corresponds to the required operating temperature range and package type before procurement to ensure compatibility with design specifications.

Selection Notes

Select this component when a low-cost, fixed 1.25 V reference is required for space-constrained designs. Ensure the circuit design accommodates the shunt configuration and that the available current exceeds the minimum operating requirement while staying within the maximum power dissipation limits of the SOIC-8 package.

Part Context

This part belongs to the LM285 family of micro-power voltage reference diodes. These devices are widely used in industrial and consumer electronics where a reliable, low-drift voltage source is needed. The LM285 series offers various fixed voltage options and tolerances to suit different precision requirements.

Replacement Considerations

Compatible substitutes include the LM385-1.2 and LM4040AIM3-1.2. Verify pinout compatibility and thermal performance characteristics when transitioning between these alternatives.