STMicroelectronics

LD1117V33

LD1117V33 Description

The LD1117V33 from STMicroelectronics is a fixed-output 3.3V linear voltage regulator designed for high-performance, low-dropout applications. Capable of delivering up to 800mA of continuous output current, it operates with a maximum input voltage of 15V and features a low dropout voltage of 1.2V @ 800mA, making it highly efficient for power-sensitive designs. The device is housed in a TO-220AB package, ensuring robust thermal performance and ease of mounting in through-hole configurations. With a quiescent current of 10 mA and excellent 75dB PSRR (120Hz), the LD1117V33 minimizes power dissipation while maintaining stable output under varying load conditions.

LD1117V33 Features

• Fixed 3.3V Output: Ensures precise voltage regulation without external adjustments.
• High Current Capacity: Supports 800mA output, suitable for powering microcontrollers, sensors, and peripherals.
• Low Dropout Voltage: 1.2V @ 800mA maximizes efficiency in battery-operated or low-headroom applications.
• Robust Protection: Includes over-current and over-temperature safeguards for enhanced reliability.
• Wide Operating Range: Functions from 0°C to 125°C, ideal for industrial and automotive environments.
• Low Noise & High PSRR: 75dB ripple rejection at 120Hz ensures clean power delivery for sensitive analog/digital circuits.
• Compliance: ROHS3 and REACH Unaffected, meeting global environmental standards.

LD1117V33 Applications

The LD1117V33 excels in scenarios demanding stable, low-noise power:

• Embedded Systems: Powering MCUs, FPGAs, and DSPs in IoT devices and industrial controls.
• Consumer Electronics: Voltage regulation for set-top boxes, routers, and audio/video equipment.
• Automotive: Reliable performance in infotainment systems and ECU power supplies.
• Battery-Powered Devices: Efficient operation in portable instruments and handheld gadgets due to low dropout.
• Industrial Automation: Suitable for PLC modules and sensor interfaces requiring robust thermal performance.

Conclusion of LD1117V33

The LD1117V33 stands out as a versatile, high-efficiency linear regulator, combining low dropout, high current capability, and robust protection in a compact TO-220AB package. Its wide input range, excellent PSRR, and compliance with environmental standards make it a preferred choice for engineers designing reliable power supplies across consumer, industrial, and automotive applications. For projects demanding stable 3.3V power with minimal overhead, the LD1117V33 delivers unmatched performance and durability.