Explore TL431 pins, signal names, electrical functions and connection guidance for each package.
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Click a lead or use the arrow keys. Bottom view · flat edge below · 3 REF, 2 A, 1 K
The regulator sinks current from the cathode to the anode to control this voltage.
Feed through a current-limiting series resistor; connect the upper feedback resistor here.
Do not connect directly across an unrestricted supply. Recommended cathode current is 1–100 mA.
Common reference for the internal amplifier and cathode voltage.
Connect to the circuit ground and the lower divider resistor.
TO-92 physical pin 2; SOT-23 physical pin 3.
Compares the external divider node against approximately 2.495 V relative to the anode.
Connect to the junction of the two output-setting resistors.
TO-92 physical pin 3; SOT-23 physical pin 2. Reference-input current slightly raises the nominal setpoint.
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