TL431AIL3T

Overview

The TL431AIL3T is an adjustable shunt voltage reference manufactured by STMicroelectronics. It operates within a supply voltage range of 2.5 V to 36 V and supports a cathode current range from 1 mA to 100 mA. The device features a typical dynamic impedance of 0.22 Ω and offers initial accuracy options including ±1% and ±2%. It is housed in a SOT-23-3 surface-mount package and is qualified to the AEC-Q100 automotive standard, ensuring reliability across industrial and automotive environments.

Feature Summary

• Provides stable reference voltage with guaranteed temperature stability over the operating range
• Features low dynamic impedance for effective noise filtering and regulation
• Supports wide input voltage and sink current ranges for flexible circuit design
• Automotive-grade qualification ensures robust performance under harsh conditions

Applications

• Precision power supply regulation circuits
• Portable equipment voltage monitoring
• DC-to-DC converter feedback loops
• Battery-operated system references

Procurement Notes

Verify the specific suffix 'L3T' corresponds to the SOT-23-3 package and tape-and-reel configuration. Confirm that the required accuracy grade (±1% or ±2%) matches the project specifications, as precision varies within the family. Ensure the selected variant meets the necessary AEC-Q100 requirements if deployed in automotive applications. Cross-reference datasheet electrical characteristics against the final bill of materials.

Selection Notes

Select this component when a compact SOT-23-3 footprint is required for space-constrained designs. Choose based on the specific accuracy tolerance needed, noting that different suffixes may denote varying precision levels. Consider the thermal environment, as the device supports extended temperature ranges suitable for automotive use. Evaluate the trade-off between package size and thermal dissipation capabilities compared to larger packages.

Part Context

This part belongs to the widely used TL431 family of programmable shunt regulators. It serves as a direct replacement for industry-standard Zener-like references but offers superior adjustability and lower output impedance. The family is prevalent in consumer electronics and industrial control systems where precise voltage referencing is critical for analog signal processing and power management.

Replacement Considerations

Compatible substitutes include TS2431 and TL1431 variants. Verify pinout compatibility and ensure the alternative meets the same AEC-Q100 automotive qualification standards. Check that the substitute maintains the required SOT-23-3 package dimensions and electrical characteristics.