TL431QDCKTG4

Overview

The TL431QDCKTG4 is an automotive-grade, three-terminal adjustable shunt regulator manufactured by Texas Instruments. It provides a reference voltage adjustable from 2.495 V to 36 V using two external resistors. The device features a typical output impedance of 0.2 Ω and supports cathode currents ranging from 1 mA to 100 mA. It operates within a temperature range of -40°C to 125°C and is housed in a SC-70-6 surface-mount package.

Feature Summary

• Automotive qualification for specified thermal stability across commercial and military temperature ranges
• Adjustable output voltage capability between the reference threshold and maximum input limits
• Low output noise characteristics with defined dynamic impedance properties

Applications

• Board-level voltage regulation circuits
• Adjustable power supply implementations
• Switching power supply feedback loops
• Zener diode replacement applications requiring precise reference

Procurement Notes

Verify the specific suffix 'G4' indicates lead-free compliance and RoHS status as per manufacturer documentation. Confirm the SC-70-6 package dimensions match the target PCB footprint. Ensure the automotive grade designation aligns with the system's environmental operating requirements. Cross-reference the datasheet revision to confirm pinout consistency with existing designs.

Selection Notes

Select this component when automotive reliability and wide temperature operation are required. The adjustable topology allows flexibility in setting reference voltages via external resistors. Consider the SC-70-6 package size for space-constrained layouts. Verify that the 100 mA current sink capability meets the circuit's load requirements.

Part Context

This part belongs to the TL431 family of programmable shunt regulators. The 'Q' prefix denotes automotive qualification, while 'G4' typically signifies lead-free packaging. It serves as a precision voltage reference alternative to standard Zener diodes in control loop applications.

Replacement Considerations

Compatible substitutes include TL431QDCKT and TL431QDG4. Verify package compatibility and electrical parameter equivalence before substitution.