TL431BQLP

Overview

The TL431BQLP is an adjustable precision shunt regulator manufactured by Texas Instruments. It operates within a voltage range of 2.495 V to 36 V and features an initial accuracy of 0.5%. The device supports a maximum cathode current of 100 mA and has a minimum operating current of 600 uA. It functions across a temperature range of -40 °C to +125 °C with a temperature coefficient of 92 PPM/°C. The component utilizes a TO-92-3 through-hole package.

Feature Summary

• Provides programmable output voltage from 2.495 V to 36 V
• Delivers high initial accuracy of 0.5%
• Supports up to 100 mA cathode current

Applications

• Precision voltage references
• Programmable power supplies
• On-line isolation amplifiers

Procurement Notes

Verify the specific suffix 'QL' against official Texas Instruments documentation to confirm exact grade specifications, as standard TL431 variants may differ. Confirm that the TO-92-3 package matches design requirements. Check for end-of-life status or obsolescence notices prior to finalizing procurement decisions.

Selection Notes

Select this component when a 0.5% accuracy tolerance is required alongside a wide operating temperature range extending to 125 °C. Ensure the application circuit can maintain the minimum 600 uA cathode current for stable regulation. Verify that the TO-92-3 through-hole form factor fits the PCB layout constraints.

Part Context

This part belongs to the TL431 family of adjustable shunt regulators. These devices function similarly to Zener diodes but offer superior performance in terms of accuracy, temperature stability, and dynamic impedance. They are widely used in feedback loops for switching power supplies and linear regulators.

Replacement Considerations

Compatible substitutes include TL431BILPR and TL431BILPRE3. Verify pinout compatibility and electrical parameter alignment before substitution.