LM385AYZ-1.2

Overview

The LM385AYZ-1.2 is a micropower two-terminal voltage reference diode manufactured by National Semiconductor, now part of Texas Instruments. It provides a nominal output voltage of 1.235 V with an initial accuracy of ±0.5%. The device operates in shunt mode within a wide current range of 10 µA to 20 mA, ensuring stable performance across varying load conditions. It features low dynamic impedance and low noise, making it suitable for precision applications. The component is housed in a plastic TO-92 (PBCY3) package with three pins, designed for through-hole mounting. It supports commercial temperature ranges and utilizes bipolar technology for reliable long-term stability.

Feature Summary

• Provides a precise fixed reference voltage of 1.235 V with tight initial tolerance.
• Operates effectively over a wide current range from 10 µA to 20 mA.
• Features low dynamic impedance and low noise for high stability.
• Designed for micropower applications to extend battery life in portable devices.

Applications

• Portable instruments requiring low power consumption
• Battery-powered measurement equipment
• Precision analog circuits needing stable voltage references

Procurement Notes

Verify the manufacturer origin, as National Semiconductor was acquired by Texas Instruments. Confirm the specific suffix 'AYZ' indicates the ±0.5% accuracy grade and TO-92 package. Check for RoHS compliance status, as older batches may not be compliant. Ensure the sourcing channel provides genuine components to avoid counterfeit references affecting circuit precision.

Selection Notes

Select this component when a fixed 1.235 V reference is required with high initial accuracy. It is appropriate for designs where low quiescent current is critical. Compare against LM385AZ variants if lower cost or ±1% accuracy suffices. Consider thermal management if operating near maximum current limits in enclosed spaces.

Part Context

The LM385 series consists of micropower bandgap voltage reference diodes designed for shunt operation. The LM385AYZ-1.2 represents a specific grade within this family, offering tighter voltage tolerances compared to standard versions. These devices are widely used in industrial and consumer electronics where stable voltage references are essential for ADCs, DACs, and regulators.

FAQ

What is the typical dynamic impedance of the LM385AYZ-1.2?

The device exhibits very low dynamic impedance, typically around 1 ohm, which contributes to its excellent line regulation performance.

Can the LM385AYZ-1.2 operate at currents below 10 µA?

While the recommended operating range starts at 10 µA, some specifications indicate it can function down to 20 µA for standard grades; however, optimal accuracy and stability are guaranteed within the 10 µA to 20 mA range.