TL431QPKG3

Overview

The TL431QPKG3 is an adjustable shunt voltage reference integrated circuit manufactured by Texas Instruments. It operates within a cathode-to-anode voltage range of up to 36 V and provides an adjustable output voltage from 2.495 V to 36 V. The device features a typical initial accuracy tolerance of ±2.2% and supports a maximum cathode current of 100 mA with a minimum operating current of 1 mA. It is housed in a SOT-89-3 surface-mount package and is rated for an operating temperature range of -40°C to 125°C.

Feature Summary

• Provides precise adjustable voltage referencing via a three-terminal shunt regulator architecture
• Capable of handling high cathode currents up to 100 mA for robust load regulation
• Designed for wide thermal operation across industrial and extended temperature ranges

Applications

• Precision voltage references in power supply feedback loops
• Programmable linear regulators requiring stable reference nodes
• Battery-operated equipment needing accurate voltage monitoring

Procurement Notes

Verify component authenticity through authorized distribution channels due to the prevalence of counterfeits in the market. Confirm that the received parts match the specific TL431QPKG3 marking and package type. Check for moisture sensitivity level (MSL) compliance and ensure proper storage conditions were maintained prior to soldering. Review the latest product change notices for any manufacturing updates.

Selection Notes

Select this component when a standard 2.495 V reference baseline with ±2.2% accuracy is sufficient for the application requirements. Consider the SOT-89-3 package constraints regarding thermal dissipation and board space. Evaluate if the 36 V maximum voltage rating aligns with the system's peak operating conditions. Compare against higher precision variants like the TL431B series if tighter tolerances are required.

Part Context

This part belongs to the TL431 family of programmable shunt regulators, widely used as a low-cost alternative to Zener diodes. The 'Q' suffix typically denotes automotive or qualified grade specifications, while 'PKG3' identifies the specific SOT-89-3 surface-mount package variant. It serves as a fundamental building block for analog control circuits and power management systems.

Replacement Considerations

Public confirmed substitute part numbers include TL431BCPKG3 and TL431AQPK.