LM385AYZ-2.5

Overview

The LM385AYZ-2.5 is a micropower shunt voltage reference diode manufactured by National Semiconductor, now part of Texas Instruments. It provides a stable 2.5V output with an initial accuracy of ±0.5% (indicated by the 'A' suffix). The device operates within a current range of 10µA to 20mA and features a low dynamic impedance of less than 1Ω. It is housed in a TO-92 plastic package (suffix 'YZ') and is designed for applications requiring high precision and low power consumption.

Feature Summary

• Provides a precise 2.5V shunt voltage reference
• Features low dynamic impedance for stability under varying load currents
• Operates efficiently at micropower levels starting from 10µA
• Offers tight initial accuracy tolerance for precision circuits

Applications

• Precision analog-to-digital converter references
• Battery-powered measurement instruments
• Voltage monitoring circuits
• Portable test equipment

Procurement Notes

Verify the manufacturer origin as National Semiconductor or Texas Instruments, noting that legacy NS parts may be sourced through TI channels. Confirm the specific 'A' grade accuracy and 'YZ' TO-92 package details match your schematic requirements. Check for RoHS compliance status as older NS batches may differ from modern equivalents. Ensure the supplier provides valid traceability documentation for this discontinued or legacy component.

Selection Notes

Select this component when a fixed 2.5V reference is required with tighter initial accuracy than standard grades. The TO-92 package suits through-hole designs where space is not critical. Compare against LM285 or LM185 series if different temperature coefficients or accuracy grades are needed. Ensure the circuit design maintains current between 10µA and 20mA for optimal performance.

Part Context

The LM385 series belongs to the family of adjustable micropower voltage references originally developed by National Semiconductor. These devices utilize bandgap technology to provide stable reference voltages. The LM385AYZ-2.5 specifically denotes the 2.5V version with enhanced accuracy and a through-hole package, widely used in industrial and consumer electronics before being integrated into Texas Instruments' portfolio.

Replacement Considerations

LM285BZ-2.5: Similar 2.5V reference with potentially different accuracy grade. LM385MX-2.5: Surface mount alternative with identical electrical characteristics. LM185QML-2.5: Military-grade equivalent for harsh environments.