TL431SDT datasheet by NXP Semiconductors

TL431SDT Frequently Asked Questions (FAQs)

• What is the maximum operating temperature range for the TL431SDT?
  The TL431SDT can operate from -40°C to 125°C, but the accuracy and stability of the voltage reference may degrade at extreme temperatures.
• How do I ensure the TL431SDT is stable and accurate in my design?
  To ensure stability and accuracy, follow proper PCB layout guidelines, use a decoupling capacitor (e.g., 10nF) between the REF and ADJ pins, and keep the cathode current (IK) within the recommended range (1mA to 35mA).
• Can I use the TL431SDT as a voltage regulator?
  While the TL431SDT can be used as a voltage regulator, it's not recommended due to its limited current capability (35mA) and lack of short-circuit protection. Instead, use it as a voltage reference and pair it with an external transistor or regulator for higher current applications.
• How do I calculate the output voltage of the TL431SDT?
  The output voltage (Vout) of the TL431SDT is determined by the resistor divider network connected to the REF and ADJ pins. Use the formula: Vout = 2.5V x (R1 + R2) / R2, where R1 and R2 are the resistors in the divider network.
• Is the TL431SDT suitable for high-frequency applications?
  The TL431SDT is not suitable for high-frequency applications (>100kHz) due to its limited bandwidth and potential for oscillation. For high-frequency applications, consider using a dedicated voltage reference or a more specialized device.