LM285AZ-2.5

Overview

The LM285AZ-2.5 is a micropower two-terminal bandgap voltage reference diode manufactured by National Semiconductor, now part of Texas Instruments. It provides a nominal output voltage of 1.235 V and operates within an industrial temperature range of -40°C to +85°C. The device utilizes a TO-92 plastic package with three pins. Key electrical characteristics include an initial accuracy of 1% and a maximum dynamic impedance of 0.3 Ω. It functions as a shunt reference with a minimum operating current of 20 µA and a maximum shunt current of 20 mA.

Feature Summary

• Micropower operation suitable for battery-powered applications
• Low dynamic impedance for stable regulation
• On-chip trimming ensures tight voltage tolerance

Applications

• Portable instrumentation
• Micropower regulators
• Analog circuitry requiring extended battery life

Procurement Notes

Verify the manufacturer designation carefully, as National Semiconductor was acquired by Texas Instruments. Confirm that the specific suffix 'AZ' corresponds to the required 1% accuracy grade and TO-92 package variant. Ensure the component meets RoHS compliance requirements if applicable to your manufacturing standards. Cross-reference datasheets from both legacy National Semiconductor and current Texas Inventory sources to confirm pinout and thermal specifications match your design constraints.

Selection Notes

Select this component when a low-cost, low-power voltage reference is needed for precision analog circuits. The 1.235 V output is ideal for scaling or biasing applications. Consider the TO-92 package size for through-hole designs. Evaluate the 20 µA minimum current requirement against your circuit's quiescent current needs to ensure proper regulation without excessive power consumption.

Part Context

This device belongs to the LM285/LM385 series of micropower voltage reference diodes. These devices are designed for wide dynamic current ranges and feature exceptionally low noise. They are commonly used in applications where power conservation is critical, such as portable test equipment and battery-operated sensors.

Replacement Considerations

LM285Z-2.5/NOPB: Verify package and accuracy compatibility.

FAQ

What is the nominal output voltage of the LM285AZ-2.5?

The nominal output voltage is 1.235 V.

Does the LM285AZ-2.5 require a minimum operating current?

Yes, it requires a minimum operating current of 20 µA to maintain regulation.