Introduction

The Diotec Semiconductor LDI1117-3.3H-AQ is a fixed-output low-dropout (LDO) voltage regulator designed to provide a stable 3.3 V supply from a higher DC input voltage. It is suited to compact power-conditioning tasks where a simple, reliable regulated rail is required.

Part Description

The LDI1117-3.3H-AQ is a 3.3 V LDO regulator capable of supplying output current up to 1 A. Its 1.2 V dropout voltage at 1 A allows it to regulate effectively when the input supply is only moderately higher than the required 3.3 V output.

The device supports input voltages up to 15 V and includes built-in current limiting and thermal overload protection. These protective features help safeguard both the regulator and connected circuitry during overloads, short circuits, or excessive temperature conditions. With a 750 mW power dissipation rating, thermal design and input-to-output voltage difference should be considered for higher-load applications.

Applications

• 3.3 V power rails for microcontrollers
• Embedded control boards
• Sensor and measurement modules
• Communication interfaces
• Industrial logic circuits
• Battery-powered electronics with suitable input voltage
• Post-regulation of switching power supplies
• DIY and educational electronics projects

Industries

• Consumer electronics
• Industrial automation
• Telecommunications
• Internet of Things (IoT)
• Building automation
• Test and measurement
• Smart appliances
• Educational and prototyping systems

Usage Ideas

1. Microcontroller Power Supply
   Regulate a 5 V input source to provide a clean 3.3 V rail for a microcontroller, peripheral sensors, and communication modules.

2. Industrial Sensor Interface Module
   Use the regulator to power 3.3 V analog or digital sensors from a higher-voltage field supply.

3. Portable Data Logger
   Create a compact data-logging device that converts a battery or adapter input into a stable 3.3 V supply for storage, sensing, and wireless circuitry.

Conclusion

The Diotec LDI1117-3.3H-AQ is a practical fixed 3.3 V LDO regulator for low- to moderate-power electronics. Its 1 A output capability, 15 V input rating, current limiting, and thermal protection make it a useful choice for regulated logic supplies, embedded systems, and general-purpose power-conditioning designs.