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Order this document by TL431/D TL431, A, B Series Programmable Precision References The TL431, A, B integrated circuits are three–terminal programmable shunt regulator diodes. These monolithic IC voltage references operate as a PROGRAMMABLE low temperature coefficient zener which is programmable from Vref to 36 V PRECISION REFERENCES with two external resistors. These devices exhibit a wide operating current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 ?. The characteristics of these references make them excellent replacements for SEMICONDUCTOR zener diodes in many applications such as digital voltmeters, power TECHNICAL DATA supplies, and op amp circuitry. The 2.5 V reference makes it convenient to obtain a stable reference from 5.0 V logic supplies