TL1431QDG4

Overview

The TL1431QDG4 is an automotive-grade precision programmable shunt reference in an SOIC-8 package. It provides a reference voltage adjustable from approximately 2.5V to 36V using two external resistors. The device features a 0.4% initial voltage tolerance and operates over the full automotive temperature range of -40°C to +125°C. It supports a cathode current range of 1mA to 100mA with a typical output impedance of 0.2Ω.

Feature Summary

• Automotive qualification for operation across extended temperature ranges
• High precision with tight initial voltage tolerance specifications
• Fast turn-on characteristic suitable for clamp applications
• Internally compensated stability without requiring output capacitors

Applications

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

Procurement Notes

Verify that the specific ordering suffix matches the required package type and thermal rating. Confirm the component meets the intended automotive reliability standards before integration into production designs. Ensure the supply chain source provides valid traceability documentation for the Q-series designation.

Selection Notes

Select this component when automotive environmental resilience is required alongside high accuracy. The wide operating temperature range distinguishes it from commercial variants. Consider the SOIC-8 footprint constraints and the need for external feedback resistors to set the desired regulated voltage level within the specified limits.

Part Context

This part belongs to the TL1431 family of precision programmable references manufactured by Texas Instruments. The 'Q' suffix indicates automotive grade characterization, while 'DG4' specifies the surface-mount SOIC-8 package variant. It serves as a fundamental analog building block for error amplification and voltage regulation tasks.

Replacement Considerations

TL1431D (Commercial Grade)

FAQ

Is the TL1431QDG4 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.