ONSEMI TL431A Precision Adjustable Shunt Voltage Reference TO-92

The ONSEMI TL431A is a programmable precision shunt voltage reference integrated circuit, offering superior performance as a replacement for conventional zener diodes. This monolithic IC operates as a low-temperature coefficient programmable reference, adjustable from Vref (2.495V) up to 36V using just two external resistors. It delivers excellent stability and low output noise voltage, making it a highly reliable component for demanding electronic designs.

Characterised by a wide operating current range from 1mA to 100mA and a typical dynamic impedance of just 0.22Ω, the TL431A ensures stable voltage regulation under varying load conditions. Its 2.5V reference voltage makes it particularly convenient for deriving a stable reference from standard 5V logic supplies. As a shunt regulator, it offers great flexibility and can be configured as either a positive or negative voltage reference within your circuit.

Key Features & Applications

• Programmable Precision: Offers adjustable reference voltage from 2.495V to 36V.
• Low Noise & High Stability: Features low output noise voltage and is temperature compensated for reliable operation across its full specified temperature range.
• Versatile Replacement: An excellent, performance-enhanced substitute for zener diodes in numerous applications.
• Wide Applicability: Ideal for use in digital voltmeters, switch-mode and linear power supplies, operational amplifier circuitry, and general power management systems.
• Through-Hole Design: Supplied in a standard TO-92 (TO-226AA) package with straight leads for easy through-hole PCB mounting and prototyping.

With its robust specifications, including an initial accuracy of 1% and a temperature coefficient of ±50ppm/°C, the ONSEMI TL431A provides a cost-effective and precise solution for voltage reference needs in industrial, commercial, and hobbyist projects.