onsemi

NCP1117ST33T3

NCP1117ST33T3 Description

The NCP1117ST33T3 from onsemi is a fixed-output, positive-voltage linear regulator designed to deliver a stable 3.3V output at up to 1A of continuous current. With a wide input voltage range of up to 20V, this regulator is well-suited for applications requiring efficient voltage step-down from higher supply rails. It features a low dropout voltage of 1.2V (max) at 800mA, ensuring reliable operation even with marginal input voltages. The device operates across a temperature range of 0°C to 125°C, making it suitable for industrial and automotive environments. Packaged in a SOT-223 surface-mount form factor and supplied in Tape & Reel (TR), it is optimized for automated assembly processes.

NCP1117ST33T3 Features

• Fixed 3.3V Output: Eliminates the need for external feedback resistors, simplifying design.
• High Current Capability: Delivers 1A with over-current and over-temperature protection for robust performance.
• Low Dropout Voltage: 1.2V (max) @ 800mA minimizes power dissipation, enhancing efficiency.
• Excellent Line/Load Regulation: Features 64dB PSRR (120Hz), reducing noise in sensitive applications.
• Wide Operating Temperature: 0°C to 125°C ensures reliability in harsh conditions.
• Low Quiescent Current: 10mA Iq helps conserve power in battery-operated systems.
• REACH Unaffected: Compliant with environmental regulations, suitable for global markets.

NCP1117ST33T3 Applications

• Embedded Systems: Powering microcontrollers, FPGAs, and sensors in industrial automation.
• Consumer Electronics: Voltage regulation for set-top boxes, routers, and IoT devices.
• Automotive Electronics: Stable supply for infotainment systems and onboard modules.
• Power Management: Used as a post-regulator in switch-mode power supplies (SMPS) for cleaner output.
• Battery-Powered Devices: Efficient voltage conversion in portable equipment due to low dropout.

Conclusion of NCP1117ST33T3

The NCP1117ST33T3 is a high-performance linear regulator offering a balance of high current output, low dropout, and thermal protection, making it ideal for demanding applications. While marked as obsolete, its proven reliability and ease of integration ensure continued relevance in legacy designs or where replacement with newer alternatives is constrained. Its SOT-223 package and wide operating range make it a versatile choice for engineers seeking a compact, robust voltage regulation solution.