AZ431AN / TL431 Adjustable Voltage Reference IC — SOT-23, 2.5–36V, 1% (5-Pack)

AZ431AN / TL431 Adjustable Voltage Reference IC — SOT-23, 2.5–36V (5-Pack)

The AZ431AN is a precision adjustable shunt voltage reference IC in SOT-23 SMD package — functionally equivalent to the classic TL431. It maintains a precise 2.495V reference between the REF and cathode pins, with output voltage adjustable from 2.5V to 36V via an external resistor divider. The 100mA cathode current capability makes it suitable for both voltage reference and shunt regulator applications. Ubiquitous in SMPS feedback loops (flyback converter optocoupler feedback), precision voltage references, and voltage monitoring circuits. Pack of 5.

Electrical Specifications

• Part Number: AZ431AN / AZ431LANTR-E1 (equivalent to TL431)
• Package: SOT-23 (SMD)
• Reference Voltage: 2.495V (internal, ±1%)
• Output Voltage Range: 2.5V – 36V (set by external R1/R2)
• Cathode Current: 1mA – 100mA
• Output Impedance: 0.22Ω (dynamic)
• Temperature Coefficient: ~50ppm/°C (typical)
• Pack Quantity: 5 ICs

Output Voltage Formula

• Vout = Vref × (1 + R1/R2) = 2.495V × (1 + R1/R2)
• Example: 5V output — R1 = 10kΩ, R2 = 4.02kΩ
• Example: 12V output — R1 = 38.3kΩ, R2 = 10kΩ

Typical Applications

• SMPS feedback loop (flyback converter, with PC817 optocoupler)
• Precision 2.5V–36V voltage reference
• Overvoltage protection circuit
• Battery voltage monitor and alarm
• Linear regulator feedback element

AZ431AN/TL431 adjustable voltage reference, 5-pack — SOT-23, 2.5–36V, 1%, 100mA for SMPS feedback, precision voltage reference, and voltage monitor circuits.

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