LM385D-1-2

Overview

The LM385D-1-2 is a micropower two-terminal bandgap voltage reference diode manufactured by Texas Instruments. It provides a fixed nominal output voltage of 1.235 V with an initial accuracy tolerance of 1%. The device operates over a wide current range from 10 µA to 20 mA, featuring low dynamic impedance and low noise characteristics. It is rated for commercial temperature operation between 0°C and +70°C. The component utilizes a surface-mount SOIC-8 package, making it suitable for compact electronic designs requiring stable voltage regulation.

Feature Summary

• Micropower two-terminal bandgap voltage reference design
• Low dynamic impedance and low noise performance
• Wide operating current range from 10 µA to 20 mA
• Surface-mount plastic packaging available

Applications

• Portable instrumentation circuits
• Battery-powered regulators
• Analog circuitry requiring extended battery life
• Circuits with widely varying supply voltages

Procurement Notes

Verify the specific manufacturer source, as the LM385D-1-2 designation appears in documentation from multiple vendors including Motorola and ON Semiconductor. Confirm that the selected unit matches the Texas Instruments specification sheet regarding the 1% tolerance grade and SOIC-8 package type. Ensure the component meets the required commercial temperature range of 0°C to +70°C for your application environment before finalizing procurement.

Selection Notes

Select this component when a stable 1.235 V reference is needed in a surface-mount format. The 1% initial accuracy makes it suitable for precision applications where tighter tolerances are not critical. Consider the 10 µA minimum operating current requirement to ensure proper regulation during low-power states. The SOIC-8 package facilitates automated assembly in compact PCB layouts compared to through-hole alternatives.

Part Context

This part belongs to the LM285/LM385 series of micropower voltage regulator diodes. While the LM285 variant covers a wider industrial temperature range (-40°C to +85°C), the LM385 is specified for commercial temperatures (0°C to +70°C). The series is characterized by on-chip trimming for tight voltage tolerances and stable operation over time and temperature variations.

Replacement Considerations

Public confirmed substitute part numbers include LM385D-1.2/NOPB and LM385MX-1.2/NOPB.