STMicroelectronics

LF50ABDT

LF50ABDT Description

The LF50ABDT from STMicroelectronics is a fixed 5V, 500mA linear voltage regulator designed for surface-mount applications. Packaged in a DPAK (TO-252) tube, this obsolete but reliable IC offers stable voltage regulation with a low dropout voltage of 0.7V at 500mA, making it suitable for power-sensitive designs. It operates within an input voltage range up to 16V and features low quiescent current (1mA) and low supply current (12mA max), ensuring energy efficiency. With 76dB to 60dB PSRR (120Hz to 10kHz), it excels in noise-sensitive environments.

LF50ABDT Features

• Fixed 5V Output: Ensures stable voltage regulation for downstream components.
• Low Dropout Voltage: 0.7V at 500mA minimizes power dissipation.
• High PSRR (76dB @ 120Hz): Superior noise rejection for sensitive analog/digital circuits.
• Robust Protection: Includes over-current and over-temperature safeguards.
• Low Quiescent Current (1mA): Optimized for battery-powered applications.
• RoHS3 & REACH Compliant: Meets environmental standards.
• DPAK Package: Compact, thermally efficient surface-mount design.

LF50ABDT Applications

Ideal for:

• Industrial Control Systems: Stable 5V supply for sensors, microcontrollers, and logic circuits.
• Automotive Electronics: Low-noise power management in infotainment or dashboard systems.
• Consumer Electronics: Power regulation in set-top boxes, routers, and portable devices.
• Battery-Powered Devices: Efficient voltage conversion in handheld instruments.
• Noise-Sensitive Analog Circuits: High PSRR ensures clean power for audio/ADC components.

Conclusion of LF50ABDT

The LF50ABDT is a high-performance linear regulator offering low dropout, excellent PSRR, and robust protection features. While obsolete, its DPAK packaging, efficiency, and reliability make it a viable choice for legacy designs or replacements in industrial, automotive, and consumer applications. Engineers seeking a cost-effective, noise-resistant 5V regulator with proven durability may still find value in this STMicroelectronics solution.