LD1117S33CTR

Overview

The LD1117S33CTR is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 3.3 V output with a maximum continuous current of 800 mA. The device operates within an input voltage range up to 15 V and features a typical dropout voltage of 1 V at full load. It utilizes an NPN pass transistor for high efficiency, where quiescent current primarily supplies the load. The component includes internal thermal overload and short-circuit current limiting protections. It achieves a tight output voltage tolerance of ±1% at 25°C and offers a typical power supply rejection ratio (PSRR) of 75 dB at 120 Hz.

Feature Summary

• NPN pass transistor architecture ensures high efficiency by directing quiescent current into the load rather than ground.

Applications

• STEVAL-CTM015V1 driver board DC-DC power supply generation

Procurement Notes

Verify that the specific suffix 'CTR' corresponds to the SOT-223 surface-mount package configuration. Confirm the manufacturer designation as STMicroelectronics. Ensure the part number matches the required 3.3 V fixed output specification. Cross-reference the datasheet revision to confirm pinout compatibility with existing designs.

Selection Notes

Select this component when a fixed 3.3 V rail is required with moderate current demands up to 800 mA. The SOT-223 package is suitable for applications prioritizing space efficiency over high-power dissipation capabilities. Verify that the input voltage does not exceed the 15 V absolute maximum rating under all operating conditions.

Part Context

This component belongs to the LD1117 series of positive low-dropout regulators. The series includes adjustable versions and other fixed voltages such as 1.2 V, 1.8 V, 2.5 V, and 5.0 V. The LD1117 family is characterized by its use of NPN pass transistors and availability in multiple packages including DPAK, SO-8, and TO-220 alongside the SOT-223.

Replacement Considerations

• LD1117S33TR
• LD1117AS33TR