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TL431A/KA431A Programmable Shunt Regulator

SKU: EAX94OLQDH
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4.3 (104 reviews)
The TL431A / KA431A is a precision programmable shunt voltage regulator that functions as an adjustable Zener diode with excellent accuracy and temperature stability. It features an internal 2.495V precision voltage reference and allows the regulated output voltage to be adjusted from 2.5V to 36V using only two external resistors. Unlike conventional Zener diodes, the TL431A/KA431A offers significantly better voltage...
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The TL431A / KA431A is a precision programmable shunt voltage regulator that functions as an adjustable Zener diode with excellent accuracy and temperature stability. It features an internal 2.495V precision voltage reference and allows the regulated output voltage to be adjusted from 2.5V to 36V using only two external resistors.

Unlike conventional Zener diodes, the TL431A/KA431A offers significantly better voltage regulation, lower dynamic impedance, and higher precision, making it ideal for voltage reference circuits, power supply feedback, battery chargers, overvoltage protection, current limiting, and switch-mode power supplies (SMPS). It is commonly used with optocouplers to provide isolated feedback in AC-DC power supplies.

Available in a compact TO-92 through-hole package, the TL431A/KA431A is widely used in consumer electronics, industrial equipment, automotive systems, embedded designs, and DIY electronics projects.

Key Features

  • Precision programmable shunt voltage regulator
  • Adjustable output voltage from 2.5V to 36V
  • Internal 2.495V precision reference
  • Excellent temperature stability
  • Low dynamic output impedance
  • High accuracy voltage regulation
  • Wide operating current range
  • Low output noise
  • Fast turn-on response
  • Excellent replacement for Zener diodes
  • Suitable for SMPS feedback circuits
  • Supports voltage monitoring and protection
  • Compact TO-92 package
  • Ideal for power management and embedded electronics

Shipping & Returns

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Specifications

Specifications:

Component Type: Programmable Shunt Voltage Regulator
Part Number: TL431A / KA431A
Package Type: TO-92 Through-Hole
Reference Voltage: 2.495V (Typical)
Reference Voltage Accuracy: ±1% (A Grade Typical)
Adjustable Output Voltage Range: 2.5V to 36V
Maximum Cathode Voltage: 37V
Operating Cathode Current: 1mA to 100mA
Minimum Regulation Current: Approximately 1mA
Dynamic Output Impedance: Approximately 0.2Ω (Typical)
Reference Input Current: Typically 2µA
Output Type: Adjustable Shunt Regulator
Temperature Stability: Excellent
Operating Temperature: -40°C to +125°C (Industrial Grade, Variant Dependent)
Storage Temperature: -65°C to +150°C
Mounting Type: Through-Hole
Package Dimensions: Standard TO-92
Compatibility: SMPS, Battery Chargers, Power Supplies, Voltage Reference Circuits, Arduino and Embedded Electronics

Additional Resources

TL431A.PDF

FAQ

1. What is the TL431A / KA431A Programmable Shunt Regulator used for?

The TL431A / KA431A is used for precision voltage regulation, adjustable voltage references, SMPS feedback, battery chargers, overvoltage protection, current limiting, and power supply control circuits.

2. How is the output voltage adjusted on the TL431A?

The output voltage is adjusted by connecting two external resistors as a voltage divider between the cathode, reference, and anode pins, allowing the output to be set anywhere from 2.5V to 36V.

3.What is the difference between the TL431A and a standard Zener diode?

The TL431A provides much higher accuracy, lower dynamic impedance, adjustable output voltage, and superior temperature stability compared to a conventional fixed-voltage Zener diode.

4. Can the TL431A be used in switch-mode power supplies?

Yes. The TL431A is widely used as the feedback reference in SMPS designs, typically together with an optocoupler, to provide precise output voltage regulation.

5. What is the maximum current that the TL431A can regulate?

The TL431A supports a cathode current from approximately 1mA to 100mA, making it suitable for a wide range of precision voltage regulation and reference applications.