TL431ACDRG4

Overview

The TL431ACDRG4 is an adjustable precision shunt regulator from Texas Instruments, part of the TL431 family. It operates with a reference voltage range from 2.495V to 36V and offers an initial accuracy of ±1%. The device supports a maximum output current of 100mA and features a temperature coefficient of 92 ppm/°C. Designed for surface mount installation, it utilizes an 8-SOIC package. The component functions within a temperature range of 0°C to 70°C and includes a minimum cathode current requirement of 600 µA for stable regulation.

Feature Summary

• Adjustable output voltage capability ranging from the internal reference level up to 36V using external resistors
• High precision performance with ±1% initial accuracy tolerance at 25°C
• Stable operation as a shunt regulator with sink-current capability between 0.2mA and 100mA
• Pin-compatible design allowing direct replacement for industry-standard TL431 devices

Applications

• Onboard regulation circuits
• Adjustable power supplies
• Switching power supplies
• Undervoltage monitoring comparators

Procurement Notes

Verify the specific suffix 'G4' indicates RoHS compliance and lead-free manufacturing status as per Texas Instruments documentation. Confirm the 8-SOIC package dimensions match the target PCB footprint. Ensure the operating temperature range of 0°C to 70°C meets the environmental requirements of the final assembly. Check for any recent Product Change Notifications regarding pinout or electrical specifications.

Selection Notes

Select this component when a precise, adjustable voltage reference is required in a compact surface-mount form factor. The ±1% accuracy makes it suitable for applications demanding tighter tolerances than standard Zener diodes. Consider the 100mA sink current limit when designing feedback loops for power converters. Verify that the 0°C to 70°C commercial temperature range is sufficient for the intended application environment.

Part Context

This device belongs to the widely used TL431 series of programmable shunt regulators. It serves as a fundamental building block for error amplifiers in isolated flyback power supplies. The TL431ACDRG4 variant specifically denotes the automotive-grade or enhanced reliability version within the standard TL431 lineup, packaged in an 8-pin Small Outline Integrated Circuit (SOIC) format for automated assembly.

Replacement Considerations

Direct substitutes include the TL431ACDR and LM431ACM/NOPB. These alternatives share similar electrical characteristics and pinouts. Verify package compatibility and temperature ratings before substitution. Other compatible options may include devices from different manufacturers that are explicitly listed as pin-compatible replacements in official datasheets.