LM385AYM-2.5

Overview

The LM385AYM-2.5 is a micropower shunt voltage reference diode manufactured by National Semiconductor, operating within the LM185/LM285/LM385 family. It provides a fixed 2.5V output with an initial accuracy of ±0.8% (A-grade). The device operates over a commercial temperature range of 0°C to 70°C and supports a wide current range from 20µA to 20mA. It features low dynamic impedance and low noise characteristics suitable for precision applications.

Feature Summary

• Micropower operation with a wide working current range from 20µA to 20mA
• High initial accuracy with A-grade tolerance of ±0.8%
• Low dynamic impedance ensuring stable regulation under varying load conditions
• Low noise performance suitable for sensitive analog circuits

Applications

• Portable battery-powered instruments
• Precision current sources
• Temperature sensor interfaces and cold junction compensation
• General-purpose analog circuitry requiring stable references

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin configuration matches the SOIC-8 specification. Check for RoHS compliance status as older National Semiconductor parts may vary in environmental certification requirements compared to modern equivalents.

Selection Notes

Select this component when a fixed 2.5V reference with high precision is required in space-constrained designs. The A-grade variant offers tighter tolerance than standard versions. Ensure the application maintains minimum cathode current above 20µA for proper regulation. Consider thermal management if operating near maximum current limits in enclosed environments.

Part Context

This part belongs to the LMx85 series of two-terminal bandgap voltage references. It shares functional similarities with LM185 and LM285 variants but differs in temperature rating and accuracy grade. The LM385 series is widely used in industrial and consumer electronics where reliable voltage referencing is critical for ADC/DAC systems and measurement instrumentation.

Replacement Considerations

LM385B-2.5/NOPB: Texas Instruments equivalent with similar specifications and lead-free construction.