ATL431BIDBZR

Overview

The ATL431BIDBZR is a three-terminal adjustable precision shunt regulator manufactured by Texas Instruments. It operates within an ambient temperature range of -40°C to 85°C and utilizes a SOT-23-3 surface-mount package. The device features a reference voltage tolerance of ±0.5% and supports an output voltage range from approximately 2.5V up to 36V, set via external resistors. Key electrical specifications include a typical temperature drift of 9mV over the commercial range, a low output impedance of 0.2Ω, and a cathode current capability ranging from 1mA to 100mA.

Feature Summary

• Provides programmable output voltage functionality with high precision accuracy
• Features low output noise and low output impedance for stable regulation
• Designed as a direct replacement for standard Zener diodes in circuit designs

Applications

• Shunt regulator circuits
• Precision constant current sinks
• Isolated feedback loops for Switch Mode Power Supplies (SMPS)

Procurement Notes

Verify that the specific ATL431BIDBZR part number corresponds to the Texas Instruments ATL43x family datasheet rather than the Nexperia TL431 series, as naming conventions may overlap across manufacturers. Confirm the operating temperature grade matches the required application environment. Ensure the SOT-23-3 package footprint aligns with the PCB design constraints before finalizing procurement orders.

Selection Notes

Select this component when a precise, low-noise shunt reference is required within a compact surface-mount form factor. The ±0.5% tolerance makes it suitable for applications demanding higher accuracy than standard grades. Consider the 1mA minimum cathode current requirement to ensure proper regulation during operation. Evaluate thermal stability needs against the specified temperature coefficient for the target operating range.

Part Context

This device belongs to the ATL43x family of low quiescent current adjustable precision shunt regulators. It serves as a specialized variant within the broader TL431 lineage, offering enhanced performance characteristics such as tighter initial accuracy and optimized noise profiles. The ATL431BIDBZR specifically denotes the B-grade (±0.5%) version intended for industrial or commercial temperature ranges.

Replacement Considerations

The TL431BIDBZR is a confirmed substitute part number within the same functional family. Verify pinout compatibility and electrical parameter alignment before substitution.