Texas Instruments

REG1117F-3.3KTTT

REG1117F-3.3KTTT Description

The REG1117F-3.3KTTT is a fixed-output linear voltage regulator from Texas Instruments, designed to deliver a stable 3.3V output with a maximum current of 800mA. This surface-mount device features a low dropout voltage of 1.2V @ 800mA, making it suitable for applications with tight input-output differential requirements. The regulator operates with an input voltage range up to 15V and offers high PSRR (62dB @ 120Hz), ensuring minimal noise interference in sensitive circuits. Although marked as obsolete, it remains a reliable choice for legacy designs due to its robust performance and compliance with ROHS3 and REACH standards.

REG1117F-3.3KTTT Features

• Fixed 3.3V Output: Ideal for systems requiring a precise voltage reference.
• High Current Capacity: Supports up to 800mA load current with 10mA quiescent current, enhancing efficiency.
• Low Dropout Voltage: 1.2V @ 800mA minimizes power dissipation, extending battery life in portable devices.
• Advanced Protection: Includes over-current and over-temperature safeguards for enhanced reliability.
• Surface-Mount Packaging: Supplied in Tape & Reel (TR) for automated assembly, compatible with DDPAK footprint.
• High PSRR (62dB @ 120Hz): Reduces ripple and noise, critical for analog and RF applications.

REG1117F-3.3KTTT Applications

• Embedded Systems: Powering microcontrollers, sensors, and peripherals in industrial and consumer electronics.
• Portable Devices: Efficient voltage regulation for battery-powered equipment like handheld instruments.
• Automotive Electronics: Auxiliary power management in infotainment or telematics systems (within voltage limits).
• Legacy Designs: Suitable for maintaining or repairing older systems where component obsolescence is a concern.

Conclusion of REG1117F-3.3KTTT

The REG1117F-3.3KTTT excels in delivering stable, low-noise power with robust protection features. While obsolete, its high PSRR, low dropout, and 800mA output make it a pragmatic choice for legacy or cost-sensitive designs. Engineers should evaluate alternative modern regulators for new projects but can rely on this model for proven performance in existing applications.