AZ431LBZ-E1

Overview

The AZ431LBZ-E1 is a three-terminal adjustable precision shunt regulator manufactured by Diodes Incorporated. It operates within an output voltage range of 1.24 V to 18 V and features an initial accuracy of 1%. The device has a maximum temperature coefficient of 20 PPM/°C and supports a maximum cathode current of 100 mA. It functions with a minimum operating current of 100 µA and withstands input voltages up to 1.252 V relative to the reference. The component is housed in a TO-92-3 package, designed for through-hole mounting, and ensures thermal stability across an operating temperature range from -40°C to +125°C.

Feature Summary

• Provides programmable precise output voltage between 1.24 V and 18 V using two external resistors.
• Features sharp turn-on characteristics and low output impedance for stable regulation.
• Offers guaranteed thermal stability over the full operational temperature range.

Applications

• Switching power supplies
• Chargers
• Motherboard voltage regulation

Procurement Notes

Verify the specific suffix 'E1' against the manufacturer's official datasheet to confirm compliance with RoHS directives and REACH standards. Confirm that the TO-92-3 through-hole package matches the target PCB footprint requirements. Ensure the 1% initial accuracy specification meets the design tolerance limits before finalizing procurement decisions.

Selection Notes

Select this component when a low-voltage adjustable reference is required in a through-hole configuration. The 1.24 V minimum output distinguishes it from standard 2.5 V references. Verify that the 100 mA sink current capacity is sufficient for the application load. Consider the 20 PPM/°C temperature coefficient for thermal drift sensitivity in the circuit environment.

Part Context

This part belongs to the AZ431L series, which is specifically engineered for low-voltage applications starting at 1.24 V. It serves as a direct replacement for Zener diodes in circuits requiring higher precision and better temperature stability. The series includes variants with different accuracies and packages, but the LBZ variant specifically denotes the 1% tolerance and TO-92 form factor.

Replacement Considerations

AZ431LAZTR-G1 (SOT-23-5 surface mount equivalent)

FAQ

What is the minimum operating current required for the AZ431LBZ-E1?

The minimum operating current is 100 µA.

Can the AZ431LBZ-E1 be used as a direct substitute for a Zener diode?

Yes, it is designed as an ideal substitute for Zener diodes due to its sharp turn-on characteristics and low output impedance.