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LD1117DT33CTR

LD1117DT33CTR

STMicroelectronics
Linear Voltage Regulator IC Positive Fixed 1 Output 800mA DPAK
Active53,612 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The LD1117DT33CTR is a low dropout linear regulator capable of providing up to 800mA of output current at a fixed 3.3V. It operates with an input voltage up to 15V and features internal current and thermal limiting to protect the device and system during fault conditions. This regulator is housed in a DPAK surface-mount package, making it suitable for compact power management designs.

Why Choose This Part

The device features on-chip trimming to ensure tight output voltage accuracy and a high Power Supply Rejection Ratio (PSRR) of 75dB at 120Hz for noise-sensitive applications. Its thermal shutdown and current limiting provide robust protection against short circuits or overheating.

Applications

Microcontroller Power Supply
Provides a stable 3.3V rail for MCUs and digital logic from higher voltage DC inputs.
Post-Regulation
Used after a switching regulator to reduce ripple and noise for sensitive analog circuits.
Battery Powered Systems
Efficiently regulates battery stacks to a standard logic level with a low dropout voltage.
Industrial Instrumentation
Supplies reliable power to sensors and communication interfaces in harsh thermal environments.

Key Specifications

PSRR 75dB (120Hz)
Output Type Fixed
Mounting Type Surface Mount
Package / Case TO-252-3, DPAK (2 Leads + Tab), SC-63
Current - Output 800mA
Protection Features Over Current, Over Temperature
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC
Voltage - Input (Max) 15V
Voltage Dropout (Max) 1.3V @ 800mA
Supplier Device Package DPAK
Current - Quiescent (Iq) 10 mA
Voltage - Output (Min/Fixed) 3.3V

Getting Started

When designing the PCB layout for the DPAK package, ensure adequate copper pour area on the tab to manage thermal dissipation. A minimum of 10uF tantalum or electrolytic capacitor is typically required on the output for stability, though designers should consult the datasheet for Equivalent Series Resistance (ESR) requirements.

Also Consider

LM1117MPX-3.3/NOPB TITexas Instruments - A widely available industry-standard alternative with similar current and dropout specifications.
AZ1117CH-3.3TRG1 DIODiodes Incorporated - A cost-effective 1117-series alternative often used in high-volume consumer electronics.