- Published in issue 7/2019 on page 63
TL431 Precision Programmable Reference
Peculiar parts, the series
There’s a good chance that you’ve used a TL431 programmable reference recently without even knowing it. These small 3-terminal devices blend in with their surrounding circuitry which makes them difficult to spot but they are the voltage reference used in many power supplies. Let’s see what makes them so popular.