TL431QDBZR

TL431QDBZR is a Texas Instruments adjustable shunt voltage reference in a SOT-23-3 package — the TL431 programmable-Zener reference used in power-supply feedback and voltage monitoring. Read the code carefully: the Q here is a temperature-range letter (−40 to +125 °C) and the accuracy position is empty, so this is the standard ±2% grade — reference 2.440 V to 2.550 V, deviation 14 mV typical / 34 mV maximum over temperature, minimum cathode current 0.4 mA typical / 1 mA maximum, cathode current 1 mA to 100 mA, and output adjustable from Vref to 36 V. Selection advice: this is a Catalog-rating industrial part, not an automotive part — TI's AEC-Q100-qualified TL431 family is the separate TL431-Q1 line, so do not present this code for automotive programs; and do not let it be quoted against the A (1%) or B (0.5%) grades where the loop accuracy budget depends on the grade letter. TI lists this code as Active (Production). Parameters verified against Texas Instruments documentation.