NCV431A

The TL431, A, B integrated circuits are three−terminal programmable shunt regulator diodes. These  TL431 monolithic IC voltage references operate as a low temperature coefficient zener which is programmable from V_ref to 36 V with two external resistors. These  TL431 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 zener diodes in many applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5 V reference makes it convenient to obtain a stable reference from 5.0 V logic supplies, and since the TL431, A, B operates as a shunt regulator, it can be used as either a positive or negative voltage reference.