TL431IPK3

Overview

The TL431IPK3 is an adjustable precision shunt regulator manufactured by Texas Instruments. It operates within a cathode voltage range of 2.495V to 36V and supports a maximum cathode current of 100mA. The device features an initial accuracy of ±1% and a maximum temperature coefficient of 92ppm/°C. It is housed in a SOT-89-3 surface-mount package and functions across an operating temperature range from -40°C to +85°C.

Feature Summary

• Provides precise programmable reference voltage via external resistor divider
• Ensures stable regulation with low dynamic impedance characteristics
• Offers high thermal stability across extended industrial temperature ranges

Applications

• Precision power supply feedback loops
• Portable equipment voltage monitoring
• Battery-operated system references

Procurement Notes

Verify the specific suffix 'IPK3' against the official Texas Instruments datasheet to confirm the exact pinout, tolerance grade, and tape-and-reel packaging specifications. Ensure the procurement source provides valid RoHS compliance documentation consistent with the manufacturer's current product change notices.

Selection Notes

Select this component when a compact surface-mount solution is required for adjustable voltage referencing. The SOT-89-3 package offers a balance between thermal dissipation and board space efficiency compared to smaller alternatives, suitable for designs requiring ±1% initial accuracy without complex calibration.

Part Context

This part belongs to the widely adopted TL431 family of three-terminal adjustable shunt regulators. It serves as a cost-effective alternative to Zener diodes, offering superior performance in terms of temperature coefficient and output impedance for linear power supply applications.

Replacement Considerations

Compatible substitutes include the TL431AIPKG3 and TL431QDBVT. Verify that replacement parts maintain identical pin configurations and electrical parameters before integration into existing circuit designs.