MC7811

The MC7811 is a voltage regulator integrated circuit manufactured by Motorola, now ON Semiconductor. It belongs to the 78xx series of three-terminal positive voltage regulators, designed to provide a stable output voltage. Specifically, the MC7811 is rated to deliver a fixed 11-volt output. This makes it suitable for applications requiring a precise and regulated 11V supply from a higher, unregulated input voltage.

The device operates with an input voltage range typically from 14V to 25V, ensuring that the output remains regulated even with fluctuations in the input. It features built-in overcurrent and thermal shutdown protection, which safeguard the device and the connected circuitry from damage due to excessive current draw or overheating. The MC7811 is commonly found in consumer electronics, power supplies, and various electronic projects where a steady 11V is needed. It is available in standard packages such as the TO-220, facilitating easy mounting and heat sinking. The simplicity of its three-terminal configuration, requiring only minimal external components for operation, makes it a popular choice for designers.