LD1117DT50CTR – Integrated Circuit – STMicroelectronics

About this part

LD1117DT50CTR – 5V 800mA Low Dropout Linear Regulator – STMicroelectronics

Optimize your power management with the STMicroelectronics LD1117DT50CTR LDO regulator. This compact surface-mount IC delivers stable 5V output for energy-sensitive applications, featuring ultra-low dropout voltage and robust protection circuits. Perfect for designs requiring reliable voltage conversion with minimal power loss.

Key Features

• Fixed 5V Output with ±1% accuracy
• 800mA Continuous Current capacity
• Ultra-Low Dropout: 1.3V max @ 800mA (15V input max)
• High PSRR: 75dB noise rejection at 120Hz
• Wide Temperature Range: -40°C to 125°C operation
• Protection: Over-current and over-temperature safeguards

Technical Details

This single-channel positive regulator uses a fixed output configuration in a space-saving DPAK (TO-252) package. With quiescent current of 10mA and surface-mount compatibility (SC-63), it maintains efficiency across industrial environments. The LD1117 series architecture ensures stable performance under load variations.

Typical Applications

• Embedded systems and microcontroller power rails
• IoT devices and battery-powered equipment
• Industrial control systems
• Consumer electronics voltage conversion
• Automotive accessory modules

About STMicroelectronics

STMicroelectronics is a global semiconductor leader with 30+ years of innovation in power management ICs. Their components are renowned for industrial-grade reliability and compliance with international quality standards.

The company invests heavily in R&D, resulting in optimized designs like the LD1117 series that deliver exceptional thermal performance and longevity. STMicroelectronics’ rigorous testing protocols ensure consistent operation in mission-critical applications worldwide.

About Low Dropout (LDO) Regulators

LDO regulators maintain stable output voltages with minimal input-output differentials, making them essential for modern electronics where energy efficiency is critical. They eliminate switching noise while compensating for input fluctuations.

These ICs are fundamental in power sequencing, noise-sensitive circuits, and battery-operated devices. Their simplicity and reliability make them preferred solutions over switching regulators when clean power delivery is paramount.

Packaging Options

Available in Tape & Reel (TR), Cut Tape (CT), and Digi-Reel® formats for automated assembly. Specify packaging preference at checkout.

FAQs

Q: What is the dropout voltage at 500mA load?
A: Typical dropout is 1.0V at 500mA – significantly lower than the 1.3V maximum rating at 800mA.

Q: Does this require external capacitors?
A: Yes, a 10μF ceramic output capacitor is recommended for stability. Refer to the datasheet on PCXCo.com for implementation details.

Q: Is it suitable for automotive applications?
A: While industrial-rated (-40°C to 125°C), verify against specific automotive standards for your project.

Q: Can it handle input voltage spikes?
A: The 15V absolute maximum rating provides headroom for transient protection. Pair with input filtering for surge-prone environments.

Q: What’s the difference between LDO and standard linear regulators?
A: LDOs operate with much lower input-output voltage differentials (dropout), preserving efficiency in low-voltage systems.

Q: How does over-temperature protection work?
A: The IC automatically shuts down at ≈150°C and resumes operation when temperatures normalize.

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