STMicroelectronics

LF50CDT

LF50CDT Description

The LF50CDT from STMicroelectronics is a fixed-output, positive linear voltage regulator designed to deliver a stable 5V output at up to 500mA of continuous current. With a maximum input voltage of 16V and a low dropout voltage of 0.7V @ 500mA, this regulator ensures efficient power conversion in space-constrained applications. Packaged in a DPAK (TO-252) surface-mount form factor, the LF50CDT is ideal for PCB designs requiring robust thermal performance and compact footprints. Although marked as obsolete, it remains a reliable choice for legacy systems due to its overcurrent and overtemperature protection, ensuring safe operation under demanding conditions.

LF50CDT Features

• High Precision: Fixed 5V output with tight voltage regulation.
• Low Dropout: 0.7V dropout @ 500mA minimizes power dissipation.
• Low Quiescent Current: 1 mA Iq enhances efficiency in battery-powered systems.
• Robust Protection: Integrated overcurrent and overtemperature safeguards.
• Excellent Noise Rejection: 76dB ~ 60dB PSRR (120Hz–10kHz) for clean output in sensitive circuits.
• Compliance: ROHS3 and REACH compliant, with MSL 1 (Unlimited) moisture sensitivity.
• Compact Packaging: DPAK (TO-252) for efficient heat dissipation and space savings.

LF50CDT Applications

The LF50CDT excels in applications requiring stable, low-noise voltage regulation, such as:

• Embedded Systems: Powering microcontrollers, sensors, and logic circuits.
• Consumer Electronics: Voltage stabilization in set-top boxes, routers, and audio devices.
• Industrial Controls: Reliable supply for PLCs, motor drivers, and instrumentation.
• Automotive Electronics: Auxiliary power for infotainment or telematics (non-safety-critical).
• Legacy Equipment: Maintenance or repair of older designs where obsolete components are still viable.

Conclusion of LF50CDT

The LF50CDT is a dependable linear regulator offering a balance of efficiency, protection, and compact design. While newer alternatives may exist, its low dropout, high PSRR, and robust protections make it suitable for noise-sensitive or thermally constrained applications. Engineers working on legacy systems or cost-sensitive designs will find it a practical solution, despite its obsolete status. For projects demanding 5V regulation with minimal overhead, the LF50CDT remains a technically sound choice.