AMS1117-1.8 SOT-223

Overview

The AMS1117-1.8 is a fixed-output low-dropout linear regulator manufactured by Shenzhen Slkormicro Semicon Co., Ltd. in the SOT-223-3 package. It provides a stable 1.8V output with a maximum current of 800mA to 1A. The device features a typical dropout voltage of 1.3V at full load and offers high power supply rejection ratio (PSRR) of approximately 70dB at 120Hz. Operating within a recommended input range of 4.75V to 15V, it includes integrated thermal shutdown and current limiting protection for reliable operation across temperatures from -40°C to +125°C.

Feature Summary

• Fixed 1.8V output voltage with ±1% or ±1.5% accuracy
• Integrated thermal shutdown and current limit protection
• Low dropout voltage enabling efficient battery-powered designs
• High power supply rejection ratio for clean power delivery

Applications

• Microcontroller unit (MCU) power supplies
• Sensor circuit powering
• Wireless module voltage regulation
• Battery charger systems
• General-purpose linear voltage regulation

Procurement Notes

Verify the manufacturer designation as Shenzhen Slkormicro Semicon Co., Ltd. rather than AMS. Confirm the specific package variant is SOT-223-3. Ensure the output voltage is strictly 1.8V fixed type. Check for RoHS compliance status if required by your assembly process. Validate pinout compatibility with existing PCB footprints before procurement.

Selection Notes

Select this component when a stable 1.8V rail is required for digital logic or analog circuits. Ensure the input voltage remains above 3.1V to maintain regulation under load. Consider thermal dissipation requirements for loads approaching 800mA. Verify that the SOT-223 package provides adequate heat sinking for your application environment.

Part Context

This part belongs to the AMS1117 family of low-dropout regulators. It shares architectural similarities with other 1117-series devices but is specifically configured for 1.8V output. The SOT-223 package allows for surface-mount installation with an exposed pad for thermal management. It serves as a cost-effective solution for embedded power distribution.

Replacement Considerations

Compatible replacements include TLV1117, NCP1117, ME1117, and CJT1117 in SOT-223 packages. Verify pinout alignment, particularly regarding the ground connection on the exposed pad. Ensure replacement parts support the same 1.8V fixed output and current capabilities.