LM285AXZ-1.2

Overview

The LM285AXZ-1.2 is a micropower voltage reference diode manufactured by National Semiconductor, now part of Texas Instruments. It provides a fixed output voltage of 1.235 V with an initial tolerance of ±2%. The device operates within a temperature range of 0°C to 70°C and features a maximum quiescent current of 15 µA. It is housed in a plastic TO-92 three-pin package (SIP3) and is designed for shunt regulation applications requiring low power consumption.

Feature Summary

• Provides a stable fixed reference voltage of 1.235 V
• Designed for micropower applications with low quiescent current
• Utilizes a two-terminal shunt regulation architecture

Applications

• Battery-powered instrumentation circuits
• Portable measurement devices
• Low-power analog reference sources

Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets are managed by Texas Instruments. Confirm the specific suffix 'XZ' corresponds to the TO-92 plastic package and the 0-70°C commercial temperature grade. Ensure compliance requirements match the project specifications, noting that some listings indicate non-Rohs status for older variants.

Selection Notes

Select this component when a low-cost, fixed 1.235 V reference is required for shunt regulator topologies. It is suitable for designs where space constraints favor the TO-92 package over surface-mount options. Consider the ±2% initial accuracy and 0-70°C operating range against stricter precision or wider temperature needs.

Part Context

This device belongs to the LM285 family of micropower voltage references. It shares functional similarities with the LM385 series but offers specific package and tolerance variations. The LM285AXZ-1.2 represents the 1.2V nominal variant within this lineage, widely used in legacy and cost-sensitive industrial designs.

Replacement Considerations

Direct substitutes include the LM385BZ-1.2 and LM285AZ-1.2 from Texas Instruments. Cross-manufacturer equivalents such as the LT1004 or SPX385-1.2 may be considered if pinout and electrical characteristics align with the design requirements.