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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 1.2A SOT-223
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：18V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.6V @ 1.2A
- Current - Output：1.2A
- Current - Quiescent (Iq)：500 µA
- Current - Supply (Max)：-
- PSRR：87dB ~ 65dB (120Hz ~ 100kHz)
- Control Features：-
- Protection Features：Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-261-4, TO-261AA
- Supplier Device Package：SOT-223
- Grade：-
- Qualification：-
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Overview
The LDL1117S33R is a low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed positive output voltage of 3.3 V with a maximum guaranteed output current of 1.2 A. The device operates within an input voltage range from 2.5 V to 18 V and features a typical dropout voltage of 350 mV at full load. It incorporates high power supply rejection ratio (PSRR) performance, reaching 87 dB at 120 Hz, which supports direct regulation in switch-mode power supplies. Internal protections include current limiting, thermal shutdown, and safe operating area (SOA) protection.
Feature Summary
- Provides stable 3.3 V output with up to 1.2 A continuous current capability
- High power supply rejection ratio suitable for noise-sensitive applications
- Integrated thermal, current, and power limitation protections
Applications
- Direct regulation in switch-mode power supplies
- Secondary linear regulation in DC-DC converter stages
- Low-noise power conditioning for embedded systems
Procurement Notes
Verify the specific suffix 'R' against official datasheets to confirm package type and tape-and-reel specifications. Ensure compatibility with SOT-223 footprint requirements. Confirm that the 1.2 A current rating aligns with thermal management capabilities in the target enclosure. Cross-reference the 3.3 V fixed output tolerance with circuit design margins.
Selection Notes
Select this component when a fixed 3.3 V rail is required with moderate current demands up to 1.2 A. It is appropriate for designs needing high PSRR to filter switching noise from upstream converters. Consider thermal dissipation requirements given the 350 mV dropout voltage at maximum load. Verify input voltage stability remains within the 2.5 V to 18 V operational window.
Part Context
This part belongs to the LDL1117 family of low-dropout regulators designed for efficiency and reliability. Unlike standard LDOs, it offers enhanced PSRR for use in noisy environments. The S33 designation indicates the fixed 3.3 V output variant. The 'R' suffix typically denotes reel packaging for surface-mount assembly processes.
Replacement Considerations
LDL1117S33TR: Identical electrical specifications; verify if 'TR' indicates a different reel quantity or minor packaging variation compared to 'R'. LD1117S33TR: Check if the higher 1.3 A rating and TO-220/TO-92 variants are compatible with the PCB layout and thermal constraints.
