AMS1117CD-3.3

Overview

The AMS1117CD-3.3 is a positive fixed-output low dropout linear voltage regulator manufactured by UMW, delivering up to 1A of output current. It provides a stable 3.3V output with a maximum input voltage rating of 18V and an operating junction temperature range from -40°C to 150°C. The device features a typical dropout voltage of 1.2V at full load and includes built-in thermal shutdown and current limiting protection. Packaged in the TO-252-2L (DPAK) surface-mount format, it offers line regulation of 9mV and ripple rejection of 60dB at 120Hz.

Feature Summary

• Provides fixed 3.3V output with less than 1.5% tolerance accuracy
• Integrates thermal shutdown and current limiting for overload protection
• Operates with low dropout voltage, typically 1.2V at 1A load
• Supports high efficiency linear regulation for battery-powered systems

Applications

• Post-regulators for switching power supplies
• Battery chargers and battery-powered instrumentation
• Power management for notebook and palm-top computers
• Active SCSI-II terminators and cellular phone circuits

Procurement Notes

Verify that the ordering suffix 'CD' corresponds specifically to the TO-252-2L package variant as defined in the manufacturer's nomenclature. Confirm that the required thermal resistance characteristics align with the TO-252-2L package data provided in the datasheet. Ensure compliance with RoHS3 standards and check for any specific moisture sensitivity level requirements during storage and handling procedures.

Selection Notes

Select this component when a fixed 3.3V supply is required with up to 1A continuous current capability. The TO-252-2L package is suitable for applications requiring robust thermal dissipation compared to smaller surface-mount options. Consider the 18V maximum input rating and ensure the input voltage remains within safe operating limits to prevent excessive power dissipation and potential thermal shutdown events under heavy load conditions.

Part Context

This part belongs to the AMS1117 series of three-terminal adjustable and fixed voltage regulators designed for low-voltage dropout performance. The series is available in multiple packages including SOT-223-3L, SOT-89-3L, and TO-252-2L. The AMS1117CD-3.3 specifically denotes the fixed 3.3V version housed in the TO-252-2L plastic package, offering pin compatibility with other standard three-terminal regulators.

Replacement Considerations

LD1117-3.3