TL431AW5-7

Overview

The TL431AW5-7 is an adjustable precision shunt regulator manufactured by Diodes Incorporated, housed in a SOT25 package. It provides a reference voltage tolerance of ±1.0% at 25°C with a nominal value of 2.495V. The device supports an operating temperature range from -40°C to +125°C and features a sink current capability ranging from 1mA to 100mA. Output voltage is programmable between the reference voltage and 36V using external divider resistors.

Feature Summary

• Offers excellent temperature stability across a wide industrial temperature range.
• Provides low output noise and typical dynamic output impedance of 0.2Ω.
• Capable of handling output currents up to 100mA for robust regulation.
• Totally lead-free, fully RoHS compliant, and halogen and antimony free.

Applications

• Opto-coupler linearisers
• Shunt regulators
• Improved zener diode replacements
• Variable reference circuits

Procurement Notes

Verify component authenticity through authorized channels as this part may be subject to obsolescence notices. Confirm that the specific ordering suffix matches the required package type and tolerance grade. Ensure compliance with environmental directives such as RoHS and REACH before final procurement integration.

Selection Notes

Select the TL431AW5-7 when a precise, adjustable voltage reference is required in surface-mount designs. The SOT25 package offers a compact footprint suitable for space-constrained PCB layouts. Consider the ±1.0% initial tolerance and thermal characteristics to ensure circuit accuracy meets design specifications under varying load conditions.

Part Context

This component belongs to the TL431/TL432 family of three-terminal adjustable shunt regulators. It serves as a direct electrical replacement for industry-standard Zener diodes where improved performance is needed. The device integrates a bandgap reference and error amplifier to maintain stable regulation within its specified operating limits.

Replacement Considerations

Diodes Incorporated recommends using the AS431 or AS431H families as replacements for new designs. Verify pinout compatibility and electrical specifications against the original datasheet before substituting with alternative manufacturers' parts.

FAQ

What is the minimum cathode current required for regulation?

The minimum cathode current (IKA(MIN)) for regulation is typically 0.7mA when VKA equals VREF.

How is the output voltage adjusted?

The output voltage is set to any chosen value between 2.5V and 36V by selecting two external divider resistors connected to the Reference pin.