Shunt references such as the TL431 regulate by sinking cathode current against a 2.495 V internal bandgap. They appear in feedback loops, undervoltage detectors and adjustable supplies.
In this category
- TL431CDBZR — TI 2 % SOT-23 reference (baseline for alternatives)
- TL431ACDBZR — 1 % grade
- TL432ACDBZR — pin-swapped TL432 variant
Check the exact ordering code and pinout before substituting; SOT-23 parts are not interchangeable by family name alone.