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Product Detailed Parameters
- Description：IC VREF SHUNT ADJ 0.4% 8SOIC
- Series：-
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Type：Adjustable
- Voltage - Output (Min/Fixed)：2.5V
- Voltage - Output (Max)：36 V
- Current - Output：100 mA
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width)
- Supplier Device Package：8-SOIC
- Grade：-
- Qualification：-
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Overview
The TL1431QDR is a precision programmable shunt reference in an SOIC-8 package. It features a 0.4% initial voltage tolerance and operates over the automotive temperature range of -40°C to +125°C. The output voltage is adjustable from approximately 2.5V to 36V using two external resistors. Key electrical specifications include a maximum cathode current of 100mA, a minimum regulation current of 1mA, and a typical output impedance of 0.2Ω.
Feature Summary
- Provides precise voltage referencing with specified thermal stability across automotive, commercial, and military temperature ranges.
- Features active output circuitry that delivers fast turn-on characteristics for effective clamping applications.
- Functions as a Zener diode replacement or comparator with an integrated internal reference.
Applications
- Adjustable voltage and current referencing
- Secondary side regulation in flyback SMPSs
- Voltage monitoring circuits
- Comparator applications with integrated reference
Procurement Notes
Verify the specific suffix 'QDR' corresponds to the automotive grade (TL1431Q) variant characterized for -40°C to +125°C operation. Confirm the SOIC-8 package type matches the design requirements. Ensure the ordering information aligns with the manufacturer's current production data sheet for the TL1431 series.
Selection Notes
Select this component when automotive-grade thermal stability is required alongside high initial accuracy. The device supports cathode currents up to 100mA, making it suitable for driving loads directly. Verify that the application requires an adjustable shunt regulator rather than a fixed reference. Consider the fast turn-on speed for clamp applications.
Part Context
The TL1431 is part of Texas Instruments' precision programmable reference family. It integrates an accurate voltage reference and an operational amplifier to function as a single voltage reference, error amplifier, or comparator. The Q-series variants are specifically designed for automotive environments, ensuring reliability under varying thermal conditions.
Replacement Considerations
The TL1431QDREP is a military-enhanced version of the same functional device. Other variants within the TL1431 family include the commercial TL1431C and the standard TL1431. Substitution should account for the specific temperature range and tolerance requirements of the target application.
FAQ
What is the minimum cathode current required for regulation?
The device requires a minimum cathode current of 1mA to maintain proper regulation and linear operation.
How is the output voltage programmed?
The output voltage is set between 2.5V and 36V by connecting two external resistors in a voltage divider configuration between the cathode and anode, with the midpoint connected to the reference pin.
