STMicroelectronics

LF33CDT  

Linear & Switching Voltage Regulators

LF33CDT Description

The LF33CDT from STMicroelectronics is a fixed-output linear voltage regulator designed to deliver a stable 3.3V output at up to 500mA of continuous current. With a maximum input voltage of 16V, it features a low dropout voltage of 0.7V @ 500mA, making it suitable for applications with tight voltage margins. The device is housed in a DPAK (TO-252) package, optimized for surface-mount assembly, and is RoHS3 compliant with REACH unaffected status. Although marked as obsolete, it remains a reliable choice for legacy designs requiring robust voltage regulation.

LF33CDT Features

• High Accuracy: Fixed 3.3V output with tight tolerance.
• Low Dropout: 0.7V dropout at full load ensures efficiency in low-input scenarios.
• Low Quiescent Current: Just 1 mA typical, reducing power waste in standby modes.
• Enhanced Protection: Includes over-current and over-temperature safeguards.
• Excellent PSRR: 80dB to 65dB (120Hz) noise rejection for clean power delivery.
• Wide Input Range: Supports up to 16V input, accommodating varied power sources.
• DPAK Package: Robust thermal performance for medium-power applications.

LF33CDT Applications

• Embedded Systems: Powering microcontrollers, sensors, and low-voltage logic in industrial controls.
• Consumer Electronics: Voltage regulation for set-top boxes, routers, and audio devices.
• Automotive Aftermarket: Auxiliary power for infotainment or telematics modules (non-safety-critical).
• Legacy Designs: Cost-effective replacement or maintenance for older systems requiring 3.3V regulation.

Conclusion of LF33CDT

The LF33CDT excels in providing stable, low-noise 3.3V power with robust protection features. Its low dropout and high PSRR make it ideal for noise-sensitive applications, while the DPAK package ensures thermal reliability. Though obsolete, it remains a pragmatic choice for designs prioritizing proven performance over newer alternatives. Engineers should evaluate lifecycle status but can leverage its simplicity and reliability for legacy or low-risk upgrades.

LF33CDT Documents

Download datasheets and manufacturer documentation for LF33CDT

Datasheets :

LF00 Series Datasheet      

HTML Datasheet :

LF00 Series Datasheet