TLV431AE5TA

Overview

The TLV431AE5TA is a three-terminal adjustable shunt regulator manufactured by Diodes Incorporated. It provides an initial tolerance of 1% at +25°C and operates within a temperature range of -40°C to +125°C. The device features a reference voltage (VREF) of 1.24V, with an output voltage adjustable from VREF up to 18V using external divider resistors. Recommended operating conditions specify a cathode current range of 0.1mA to 15mA and a maximum cathode voltage of 18V. The minimum cathode current for regulation is typically 80µA. It is housed in an SOT-25 package.

Feature Summary

• Adjustable output voltage capability ranging from the internal reference level up to 18V via external resistor networks.
• High precision performance with a 1% initial tolerance grade available for accurate voltage referencing.
• Robust thermal stability designed for operation across extended industrial temperature ranges.
• Low power consumption characteristics suitable for battery-powered or energy-efficient circuit designs.

Applications

• Secondary side regulation in isolated power supplies utilizing optocoupler feedback loops.
• Replacement for Zener diodes where improved voltage accuracy and temperature stability are required.
• Increasing the output voltage of fixed linear regulators by adjusting the ground pin potential.
• Implementation of high-current shunt regulators when paired with external amplifying transistors.

Procurement Notes

Verify the specific ordering suffix 'E5' corresponds to the SOT-25 package configuration during procurement. Confirm that the 1% tolerance grade meets the design requirements for initial accuracy. Ensure the supply voltage does not exceed the absolute maximum rating of 20V to prevent device failure. Check for compliance with RoHS and Halogen-free standards if environmental regulations apply to the final assembly.

Selection Notes

Select the TLV431AE5TA when a 1% initial accuracy is sufficient for the application's voltage regulation needs. Choose this component over higher tolerance grades if cost optimization is prioritized without sacrificing significant precision. Ensure the circuit design allows for a cathode current between 0.1mA and 15mA to maintain stable regulation. Consider the SOT-25 package dimensions for PCB layout compatibility compared to other available form factors.

Part Context

This component belongs to the TLV431 family of low-voltage adjustable precision shunt regulators produced by Diodes Incorporated. The family includes variants with different tolerances, such as the 0.5% B-grade and 0.2% T-grade options. These devices are widely used in power management applications requiring a stable reference voltage. The AE5TA designation specifically identifies the 1% tolerance version in the SOT-25 surface-mount package.

Replacement Considerations

Direct substitutes include the TLV431BE5TA for 0.5% tolerance and TLV431TFTA for 0.2% tolerance in compatible packages. Other manufacturers offer functionally equivalent parts like the TLV431 from Texas Instruments, though pinouts and electrical characteristics should be verified against the official datasheet before substitution.

FAQ

What is the minimum cathode current required for the TLV431AE5TA to regulate?

The typical minimum cathode current for regulation is 80µA, ensuring the device maintains stable operation under varying load conditions.

How is the output voltage determined for this shunt regulator?

The output voltage is set between 1.24V and 18V by selecting two external divider resistors connected to the reference pin.

Is the TLV431AE5TA compliant with environmental directives?

Yes, the device is totally lead-free, fully RoHS compliant, and halogen and antimony free.