AMS1117-3.3 SOT-223

Overview

The AMS1117-3.3 is a low-dropout linear voltage regulator manufactured by Shenzhen Slkormicro Semicon Co., Ltd. housed in a SOT-223 package. It provides a fixed output voltage of 3.3V with a maximum load current capability of 1A. The device features an internal current limit and thermal shutdown circuitry to protect against overload conditions. Input voltage range typically extends up to 15V, ensuring stable regulation under varying supply conditions while maintaining low noise performance suitable for sensitive analog circuits.

Feature Summary

• Fixed 3.3V output voltage regulation
• Integrated thermal shutdown protection
• Internal current limiting function

Applications

• Portable battery-powered devices
• Embedded system power supplies
• General-purpose voltage regulation

Procurement Notes

Verify the manufacturer marking on the component surface matches 'Slkormicro' or authorized distributor branding. Confirm the suffix indicates the 3.3V variant and SOT-223 package type. Request datasheet compliance documentation to ensure electrical parameters align with specified limits. Check for counterfeit indicators such as inconsistent pin spacing or poor solder joint quality during incoming inspection.

Selection Notes

Choose this regulator when a fixed 3.3V rail is required with moderate current demands up to 1A. Ensure input voltage remains within safe operating limits to prevent excessive power dissipation. Consider thermal management requirements based on ambient temperature and PCB copper area. Verify that the dropout voltage characteristics meet the minimum input-output differential needed for the application.

Part Context

This component belongs to the AMS1117 series of adjustable and fixed-output LDO regulators. The SOT-223 package offers improved thermal performance compared to smaller packages like SOT-89. It serves as a direct replacement for similar industry-standard regulators providing 3.3V output. The series is widely used in consumer electronics and industrial control applications requiring efficient linear regulation.

Replacement Considerations

Compatible substitutes include AMS1117-3.3 from other manufacturers offering identical pinout and electrical specifications. Verify package dimensions and thermal pad configuration match the existing footprint. Ensure equivalent current rating and dropout voltage characteristics are maintained for seamless integration.