STMicroelectronics

LE33CD  

Linear & Switching Voltage Regulators

LE33CD Description

The LE33CD from STMicroelectronics is a fixed-output linear voltage regulator designed to deliver a stable 3.3V output at up to 100mA of load current. This surface-mount IC operates with an input voltage range up to 18V, making it suitable for a variety of low-power applications. With a low dropout voltage of 0.5V @ 100mA, it ensures efficient regulation even when the input voltage is close to the output level. The device features over-current and over-temperature protection, enhancing reliability in demanding environments. Its quiescent current of 1mA and enable control functionality further optimize power efficiency, making it ideal for battery-powered systems.

LE33CD Features

• Fixed 3.3V Output: Ensures precise voltage regulation for sensitive circuits.
• Low Dropout Voltage: Only 0.5V @ 100mA, minimizing power dissipation.
• Wide Input Range: Supports up to 18V, accommodating various power sources.
• Low Quiescent Current: 1mA typical, ideal for energy-efficient designs.
• Enable Pin: Allows for power management via external control.
• Protection Features: Includes over-current and over-temperature safeguards.
• High PSRR: 80dB ~ 60dB (120Hz ~ 10kHz), excellent noise rejection for clean output.
• RoHS3 Compliant & REACH Unaffected: Meets environmental and safety standards.

LE33CD Applications

The LE33CD is particularly well-suited for:

• Portable Electronics: Such as handheld devices, sensors, and IoT modules, where low quiescent current and small form factor are critical.
• Industrial Control Systems: Where stable voltage regulation and protection features are essential for reliability.
• Automotive Electronics: For non-critical low-power subsystems requiring robust performance.
• Embedded Systems: Including microcontrollers and peripheral circuits needing a clean 3.3V supply.

Conclusion of LE33CD

The LE33CD stands out as a reliable, low-dropout linear regulator with a balance of efficiency, protection, and compact design. Its enable feature and low Iq make it a strong candidate for power-sensitive applications, while its high PSRR ensures stable performance in noisy environments. Although marked as obsolete, its proven performance in industrial, automotive, and portable electronics underscores its utility in legacy or long-lifecycle designs. For engineers seeking a straightforward, robust 3.3V regulator, the LE33CD remains a viable solution.

LE33CD Documents

Download datasheets and manufacturer documentation for LE33CD

Datasheets :

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HTML Datasheet :

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