ATL431AIDBZR

Overview

The ATL431AIDBZR is a three-terminal adjustable shunt regulator from Texas Instruments, housed in a SOT-23-3 surface-mount package. It provides an adjustable output voltage ranging from 2.5V to 36V, set by two external resistors. The device features an initial accuracy of ±1% and operates within a temperature range of -40°C to +85°C. Key electrical specifications include a typical output impedance of 0.2Ω, a maximum cathode current of 100mA, and a reference voltage threshold of approximately 2.5V.

Feature Summary

• Provides precise adjustable voltage regulation via external resistor divider network
• Features low output impedance for stable performance under varying load conditions
• Offers sharp turn-on characteristics suitable for replacing Zener diodes

Applications

• Board-level voltage regulation circuits
• Adjustable power supply designs
• Switching power supply feedback loops

Procurement Notes

Verify the specific manufacturer designation, as 'ATL' variants may differ from standard 'TL' series components. Confirm the exact datasheet version and pinout compatibility with existing designs. Ensure the ±1% tolerance grade meets system requirements. Check for any automotive or industrial qualification certifications if applicable to the target environment.

Selection Notes

Select this component when a compact, low-cost adjustable shunt regulator is required for space-constrained PCB layouts. The SOT-23-3 package offers a small footprint compared to through-hole alternatives. Consider the ±1% accuracy and operating temperature range to ensure compliance with the application's thermal and precision constraints.

Part Context

This part belongs to the TL431 family of programmable shunt regulators, widely used as voltage references and error amplifiers. The ATL prefix typically denotes a specific manufacturing line or variant within the broader TL431 product family, maintaining core functional compatibility while potentially differing in specific testing or packaging details.

Replacement Considerations

Standard TL431AIDBZR is functionally equivalent. Verify pinout compatibility before substitution. Other packages like TO-92 or SOIC offer similar functionality but require layout changes.