TL1431QPWR

Overview

The TL1431QPWR is a precision programmable shunt voltage reference from Texas Instruments, characterized for the full automotive temperature range of –40°C to +125°C. It features an adjustable output voltage settable between approximately 2.5 V and 36 V using two external resistors. The device offers a typical dynamic output impedance of 0.2 Ω and supports a sink current capability ranging from 1 mA to 100 mA. It includes fast turn-on characteristics with a typical time of 500 ns and low reference input current.

Feature Summary

• Precision programmable reference with specified thermal stability over automotive temperature ranges
• Adjustable output voltage capability from approximately 2.5 V to 36 V via external resistors
• Fast turn-on characteristic suitable for Zener diode replacement applications
• Low reference input current requirement for efficient operation

Applications

• Secondary side regulation in flyback switching mode power supplies (SMPS)
• Adjustable voltage and current referencing circuits
• Voltage monitoring systems
• Comparators with integrated reference

Procurement Notes

Verify that the suffix 'PWR' corresponds to the TSSOP-8 package variant as defined in the official TI orderable addendum. Confirm the specific initial accuracy grade (e.g., 0.4% or 1%) required for the design, as this may be indicated by additional ordering suffixes not present in the base model number. Ensure the automotive temperature rating aligns with system requirements.

Selection Notes

Select the TL1431QPWR when automotive-grade reliability across the –40°C to +125°C range is mandatory. This component is appropriate for designs requiring a sharp turn-on characteristic and high gain for comparator functions. Consider the TSSOP-8 package constraints if board space is limited compared to standard SOIC options.

Part Context

The TL1431 series serves as a versatile analog building block combining an accurate voltage reference and operational amplifier. While the commercial TL1431C operates from 0°C to 70°C and the military TL1431M from –55°C to 125°C, the TL1431Q variant specifically targets automotive environments. The device acts as a single voltage reference, error amplifier, or voltage clamp within power management systems.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.