LM723Adjustable precision regulator

LM723 combines a voltage reference, error amplifier, internal series pass transistor and adjustable current-limit circuit. External resistors determine the regulated output rather than a fixed internal voltage setting. This page covers the commercial LM723C grade in ST’s DIP14 and SO14 packages. The reference is nominally 7.15 V. For a lower output, divide that reference before applying it to the non-inverting input and feed the regulated output back to the inverting input. The pass-stage collector and control-circuit supply are separate pins; both must be connected correctly. The example uses a 12 V input and an approximately 5 V output, with a 10 Ω current-sense resistor and a small 1 kΩ load. All unused contacts remain unconnected. The published ST reference is an archived manufacturer document; check availability and the exact package before sourcing a legacy part.