STMICROELECTRONICS L78L05ACUTR 5V Voltage Regulator, SMD SOT89-3

The STMICROELECTRONICS L78L05ACUTR is a three-terminal positive fixed voltage regulator designed for reliable and straightforward power management. Part of the L78L series, it employs internal current limiting and thermal shutdown, making it exceptionally robust and essentially indestructible under normal operating conditions. When provided with an adequate heat-sink, this regulator can deliver a stable output current of up to 100mA.

This component is intended as a fixed voltage regulator for a wide variety of applications, including local or on-card regulation. It effectively eliminates noise and distribution problems commonly associated with single-point regulation, ensuring a clean and stable 5V supply for sensitive electronic circuits. Furthermore, it can be used in conjunction with power pass elements to construct high-current voltage regulators.

As a superior alternative to a Zener diode and resistor combination, the L78L series offers significant improvements including lower quiescent current and reduced output noise. Key features include built-in short-circuit protection and the fact that no external components are required for basic operation, simplifying circuit design and saving board space.

The regulator is supplied in a compact, three-pin SOT-89 surface-mount package (SMD), making it ideal for modern, space-constrained printed circuit board (PCB) designs. Its ability to operate across a broad input voltage range up to 30V, coupled with a wide operating temperature range from 0°C to 125°C, ensures versatility and reliability in diverse electronic environments.