Texas Instruments LM431 Adjustable Shunt Voltage Reference, 2.495V to 36V, SOT-

The Texas Instruments LM431 series is an adjustable shunt regulator designed for exceptional temperature stability across its entire operating range. This precision voltage reference allows you to set an output voltage anywhere from above 2.5V (VREF) up to 36V simply by selecting two external resistors configured as a voltage divider. Its sharp turn-on characteristics make it a superior, drop-in replacement for zener diodes in many applications, offering enhanced performance and reliability.

Engineered for precision, the device is fully temperature compensated to ensure consistent operation from -40°C to 85°C. It features a fast turn-on response, low output noise, and low dynamic output impedance, making it ideal for sensitive analogue circuits. As a green product, it is manufactured without antimony or bromine (Sb/Br), aligning with modern environmental standards.

Key Features & Specifications

• Voltage Reference Type: Adjustable Shunt Regulator
• Programmable Output Voltage: 2.495V to 36V
• High Initial Accuracy: 0.5%
• Low Temperature Coefficient: ±50 ppm/°C
• Fast Turn-On Response
• Low Output Noise & Dynamic Impedance
• Package: 3-Pin SOT-23 (Surface Mount)
• Maximum Input Voltage: 37V
• Operating Temperature Range: -40°C to +85°C
• Green Product: Free of Sb/Br

This robust and versatile component is a cornerstone for designing stable voltage rails, implementing over-voltage protection, and creating precise bias points in a wide array of electronic systems.