LM385AXZ-1.2

Overview

The LM385AXZ-1.2 is a micropower shunt voltage reference diode manufactured by National Semiconductor, now part of Texas Instruments. It provides a stable nominal output voltage of 1.235 V with an initial accuracy of ±0.5%. The device operates within a wide current range from 10 μA to 20 mA and features a low temperature coefficient of 40 ppm/°C. It is housed in a TO-92 plastic package with three pins and supports a maximum operating temperature of 70 °C.

Feature Summary

• Provides precise 1.235 V reference voltage with tight initial tolerance
• Operates efficiently across a wide dynamic current range
• Maintains stability through low temperature coefficient performance

Applications

• Precision analog-to-digital converter (ADC) references
• Portable battery-powered instrumentation
• Low-power linear regulator circuits

Procurement Notes

Verify the specific suffix 'AXZ' against official Texas Instruments documentation to confirm exact accuracy grade and package variant. Ensure compatibility with existing PCB footprints for TO-92 packages. Confirm RoHS compliance status as historical National Semiconductor parts may vary in regulatory certification depending on production batch.

Selection Notes

Select this component when high precision is required at very low currents. The ±0.5% accuracy suits applications demanding tighter tolerances than standard ±1% or ±2% variants. Consider thermal management if ambient temperatures approach the 70 °C limit, as drift increases near maximum ratings.

Part Context

This part belongs to the LM385 family of two-terminal bandgap voltage references. It shares functional similarities with the LM185 and LM285 series but offers distinct voltage and accuracy options. The AXZ designation typically indicates a specific accuracy bin and package configuration within the broader product line.

Replacement Considerations

LM385AZ-1.2: Lower accuracy variant (±1%). LM385BZ-1.2: Higher accuracy variant (±0.2%). LM385M-1.2/NOPB: Surface-mount SOIC alternative.