onsemi

NCP1117ST50T3

NCP1117ST50T3 Description

The NCP1117ST50T3 from onsemi is a fixed-output, low-dropout (LDO) linear voltage regulator designed to deliver a stable 5V output at up to 1A of continuous current. With a maximum input voltage of 20V, this regulator is well-suited for a variety of power management applications. It features a low dropout voltage of 1.2V @ 800mA, ensuring efficient operation even when the input voltage is close to the output level. The device operates over a wide temperature range of 0°C to 125°C, making it suitable for harsh environments. Packaged in a SOT-223 surface-mount form factor, it is optimized for space-constrained designs.

NCP1117ST50T3 Features

• Fixed 5V Output: Ensures stable voltage regulation without external adjustments.
• High Current Capability: Delivers up to 1A with over-current and over-temperature protection for enhanced reliability.
• Low Dropout Voltage: 1.2V @ 800mA minimizes power dissipation, improving efficiency.
• Excellent PSRR: 61dB at 120Hz reduces noise and ripple for cleaner power delivery.
• Wide Operating Temperature: 0°C to 125°C ensures performance in demanding conditions.
• Surface-Mount Package (SOT-223): Compact and suitable for automated assembly.
• Low Quiescent Current: 10 mA typical, optimizing power consumption in standby modes.

NCP1117ST50T3 Applications

This regulator is ideal for applications requiring stable, low-noise 5V power, including:

• Embedded Systems: Powering microcontrollers, sensors, and peripherals.
• Consumer Electronics: Voltage regulation in set-top boxes, routers, and audio devices.
• Industrial Controls: Reliable power for PLCs, motor drivers, and instrumentation.
• Automotive Electronics: Auxiliary power in infotainment or telematics systems (within specified temperature limits).
• Battery-Powered Devices: Efficient voltage conversion in portable equipment.

Conclusion of NCP1117ST50T3

The NCP1117ST50T3 stands out as a robust, high-performance LDO regulator, offering high current output, low dropout, and superior noise rejection. Its compact SOT-223 package and wide operating temperature range make it a versatile choice for both industrial and consumer applications. While marked as obsolete, it remains a reliable solution for designs requiring a proven 5V regulator with strong protection features. Engineers should verify alternative part availability for new designs while leveraging its strengths in existing systems.