TL1431CDR

Overview

The TL1431CDR is a precision programmable shunt reference in an 8-pin SOIC package. It features a 0.4% initial voltage tolerance and operates with cathode currents from 1mA to 100mA. The output voltage is adjustable between approximately 2.5V and 36V using two external resistors. Characterized for commercial temperatures (0°C to 70°C), it includes fast turn-on, low reference current, and typical output impedance of 0.2Ω.

Feature Summary

• Precision programmable reference with specified thermal stability
• Active output circuitry provides sharp turn-on characteristic
• Internally compensated for stability without output capacitor
• Capable of functioning as comparator or error amplifier

Applications

• Adjustable voltage and current referencing
• Secondary side regulation in flyback SMPSs
• Zener diode replacement
• Voltage monitoring
• Comparator with integrated reference

Procurement Notes

Verify the specific suffix 'C' confirms the commercial temperature range (0°C to 70°C). Confirm the 'D' suffix indicates the SOIC-8 package. Ensure the datasheet revision matches the design requirements. Check for RoHS compliance status on the ordering information page.

Selection Notes

Select based on required operating temperature range; use TL1431Q for automotive (-40°C to 125°C) or TL1431M for military (-55°C to 125°C). Verify cathode current requirements exceed the minimum 1mA for regulation. Consider load capacitance stability boundaries if capacitive loads are present.

Part Context

Part of the TL1431 family of precision programmable references. Includes variants like TL1431QDR and TL1431CDRE4. Shares internal architecture with TL431 but offers different performance characteristics and packaging options across commercial, automotive, and military grades.

Replacement Considerations

TL1431CDRE4 and TL1431CDRG4 are confirmed equivalents within the same package and specification.

FAQ

Is the TL1431 internally compensated?

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

What is the minimum cathode current required?

A minimum cathode current of 1mA is required for proper regulation.