TL1431QDRG4

Overview

The TL1431QDRG4 is an automotive-grade precision programmable shunt reference in an 8-pin SOIC package. It features a 0.4% initial voltage tolerance and operates over a -40°C to 125°C temperature range. The device regulates cathode voltages from approximately 2.5V to 36V with a typical output impedance of 0.2Ω. It supports sink currents between 1mA and 100mA, includes fast turn-on characteristics, and maintains low reference input current for efficient operation.

Feature Summary

• Provides precise adjustable voltage referencing with tight initial accuracy tolerances
• Features fast turn-on response suitable for clamp applications
• Internally compensated for stability without requiring external output capacitors
• Capable of functioning as a comparator or error amplifier with integrated reference

Applications

• Secondary side regulation in flyback switching power supplies
• Adjustable voltage and current referencing circuits
• Voltage monitoring systems
• Zener diode replacement applications

Procurement Notes

Verify the specific suffix G4 indicates lead-free and RoHS compliance status. Confirm the Q1 designation aligns with required automotive qualification standards. Ensure the SOIC-8 package dimensions match PCB footprint requirements. Validate that the thermal resistance values meet system dissipation needs.

Selection Notes

Select this component when automotive reliability and wide temperature operation are mandatory. Choose based on the 0.4% initial accuracy requirement versus standard 1% variants. Consider the 8-pin SOIC package for surface mount assembly constraints. Evaluate the 100mA sink capability against maximum load current demands.

Part Context

This part belongs to the TL1431 family of precision programmable references manufactured by Texas Instruments. The 'Q' suffix denotes automotive grade characterization, while 'D' specifies the SOIC package. The 'G4' suffix typically indicates environmental compliance. It serves as a fundamental analog building block for power management and signal conditioning.

Replacement Considerations

TL1431QDRQ1

FAQ

Is the TL1431QDRG4 internally compensated?

Yes, the device is internally compensated to remain stable without an output capacitor between the cathode and anode pins.

What is the minimum cathode current required for regulation?

A minimum cathode current of 1mA is required for the device to enter the proper linear region and maintain regulation.