STMicroelectronics Voltage Regulator 1.2 A 18 V SOT-223 4-Pin LDL1117S33R

STMicroelectronics LDL1117S33R is a high-performance voltage regulator designed for industrial, electronic component, and power management applications. This regulator supports an input voltage range of 2.5 V to 18 V and provides a guaranteed output current of up to 1.2 A. It comes in a compact SOT-223 4-pin surface mount package suitable for space-constrained PCB designs.

The device achieves a typical dropout voltage of just 350 mV at 1.2 A load, enabling efficient linear regulation. Its excellent power supply rejection ratio (PSRR) of 87 dB at 120 Hz ensures stable voltage output even in noisy power environments.

The LDL1117S33R integrates multiple safety features including internal thermal shutdown, current limiting, and power dissipation protection to enhance reliability and prevent damage under fault conditions. It supports fixed output voltages including 1.2 V (nominal 1.185 V), 1.5 V, 1.8 V, 2.5 V, 3 V, 3.3 V, and 5 V options to suit various device requirements.

With an operating temperature range from -40 °C up to 125 °C, the device is well suited for automotive, industrial, and commercial applications requiring stable power supply regulation under varying environmental conditions.

Supports input voltage from 2.5 V to 18 V. Maximum output current of 1.2 A. Low dropout voltage of 350 mV at full load current. High PSRR of 87 dB at 120 Hz. Internal thermal and current limiting protection. Available in fixed output voltages for flexibility.

Compact SOT-223 4-pin surface mount package.

This voltage regulator is ideal for use in switching mode power supplies (SMPS) and DC-DC converter linear regulation stages, providing efficient and stable power delivery in industrial, automotive, laboratory, and consumer electronics contexts.

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