TL1431ACDT

Overview

The TL1431ACDT is an adjustable shunt voltage reference integrated circuit manufactured by STMicroelectronics. It provides a stable reference voltage with an initial accuracy of ±0.25% and a temperature coefficient of 90 ppm/°C. The device operates within a supply voltage range from 2.5 V to 36 V, allowing the output voltage to be set to any value between these limits using two external resistors. It supports a cathode current range from 1 mA to 100 mA with a typical dynamic impedance of 0.2 Ω. The component is housed in an 8-SOIC package and is rated for operation at temperatures between -20°C and +70°C.

Feature Summary

• Adjustable output voltage capability ranging from 2.5 V to 36 V via external resistor network
• High precision performance with guaranteed initial accuracy of ±0.25%
• Wide operating current range supporting sink currents from 1 mA to 100 mA
• Low dynamic output impedance ensuring stable regulation under varying load conditions

Applications

• Precision power supply regulation circuits
• Programmable linear regulators
• Battery management systems requiring accurate voltage monitoring
• Industrial control equipment signal conditioning

Procurement Notes

Verify the specific suffix 'ACDT' corresponds to the 8-SOIC package and ±0.25% tolerance grade when sourcing. Confirm that the required operating temperature range aligns with the specified -20°C to +70°C limit, as automotive variants may offer extended ranges. Ensure the application design accounts for the maximum cathode current of 100 mA and the minimum operating current of 1 mA to maintain proper regulation.

Selection Notes

Select this component when high initial accuracy is critical compared to standard 1% or 2% references. The 8-SOIC package is suitable for surface-mount assembly where space constraints allow for slightly larger footprints than SOT-23 options. Consider the 90 ppm/°C temperature coefficient for applications requiring stability across moderate environmental changes without active thermal compensation.

Part Context

The TL1431 series represents a family of programmable shunt voltage references designed for cost-sensitive applications requiring better performance than fixed zener diodes. The TL1431ACDT specifically denotes the version with tighter initial tolerance specifications. This part serves as a fundamental building block for feedback loops in switching and linear power supplies, providing the necessary reference point for error amplification.

Replacement Considerations

Direct pin-compatible replacements include other manufacturers' adjustable shunt references such as the LM4040 series or NCV431A, provided the package and electrical parameters match. Verify that substitute components meet the same ±0.25% initial accuracy and 90 ppm/°C temperature coefficient requirements to ensure circuit performance consistency.