STMICROELECTRONICS LD1117 LDO Voltage Regulator, Adjustable, 0.8A, SOT-223-3

The STMICROELECTRONICS LD1117 LDO Voltage Regulator is an adjustable, low-dropout positive voltage regulator capable of delivering an output current of up to 800mA. It offers a wide, adjustable output voltage range from 1.25V to 15V, making it an exceptionally versatile component for a broad array of low-power electronic designs where precise voltage control is required.

A key benefit of this regulator is its low dropout voltage, specified at a typical 1.1V. This feature allows it to maintain a stable output even when the input voltage is only slightly higher than the desired output, which is crucial for maximising efficiency in battery-powered applications and extending operational life. The device incorporates robust internal protection, including current limiting and thermal shutdown, to safeguard both the regulator and your circuit under fault conditions.

Engineered for high performance, it provides a typical supply voltage rejection of 75dB, ensuring a clean, stable output voltage even in the presence of noise or ripple on the input supply line. This makes it ideal for powering sensitive analogue circuits, microcontrollers, and other digital ICs that require a quiet power rail. The compact, surface-mount SOT-223-3 package is designed for automated assembly and saves valuable board space in modern, dense electronic layouts.

With an operating temperature range from 0°C to 125°C, this regulator is suitable for use in commercial, industrial, and automotive environments. Its combination of adjustability, low dropout, and integrated protection makes it a reliable and efficient choice for creating custom power supplies, voltage references, and as a post-regulator for switching power supplies.