03Vcc

03Vcc is a schematic net label used to denote a positive power supply rail with a nominal voltage around 3 volts. The prefix in the label reflects a naming convention for multiple rails on the same board, distinguishing this 3-volt rail from others such as 05Vcc or 12Vcc. The label itself does not define an exact voltage; the intended value must be specified in project documentation or inferred from the connected regulator or device datasheets.

In practice, a 3-volt rail is common for low-power microcontrollers, sensors, and certain digital logic that operate in the 3.0 to 3.3-volt range. Because device tolerances and regulator outputs vary, designers should verify the actual voltage at the point of use and ensure compatibility with the connected components. Using 03Vcc in schematics helps keep power rail organization clear in boards that feature multiple supply levels.

When implementing 03Vcc, it is important to include proper decoupling near devices and to maintain consistent net labeling to prevent misconnections. Clear documentation of the exact voltage range and tolerance for the 03Vcc rail helps avoid misinterpretation during assembly or maintenance. Some organizations prefer more explicit names such as VCC_3V3 or VDD_3V3, depending on their internal conventions; the choice should be consistent across the project.

See also: Vcc, Vdd, power rail, decoupling, voltage regulator, net naming conventions.