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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 800MA 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)：15V
- Voltage - Output (Min/Fixed)：1.8V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.3V @ 800mA
- Current - Output：800mA
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：75dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-261-4, TO-261AA
- Supplier Device Package：SOT-223
- Grade：-
- Qualification：-
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Overview
The LD1117S18CTR is a fixed positive low-dropout voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 1.8 V with a maximum output current capability of 950 mA. The device operates within an input voltage range up to 15 V and features a typical dropout voltage of 1 V, reaching a maximum of 1.1 V. It utilizes a SOT-223-3 surface-mount package and maintains a line regulation of 6 mV and load regulation of 10 mV. The unit includes internal current limiting and thermal shutdown protection, ensuring stable operation across a temperature range from 0 °C to +125 °C.
Feature Summary
- Fixed 1.8 V output with high efficiency NPN pass transistor design
- Low dropout voltage characteristic for efficient power management
- Integrated internal current limit and thermal overload protection
Applications
- Battery-powered systems requiring efficient voltage regulation
- Post-regulation stages for switching power supplies
- Portable equipment with strict space constraints
Procurement Notes
Verify the specific suffix 'CTR' against the manufacturer's official datasheet to confirm packaging details such as reel size or tape-and-reel specifications. Ensure the component matches the required SOT-223-3 footprint and pinout configuration for your PCB layout. Cross-reference the part number with authorized distributors to confirm authenticity and traceability before finalizing procurement orders.
Selection Notes
Select this component when a fixed 1.8 V rail is required with moderate current demands up to 950 mA. The SOT-223 package offers a balance between thermal performance and board space savings compared to larger through-hole options. Consider the 1 V typical dropout voltage relative to your minimum input supply to ensure proper regulation under all load conditions.
Part Context
This part belongs to the LD1117 series of low-dropout positive voltage regulators. The series includes various fixed output voltages and adjustable versions, available in multiple packages including TO-220, DPAK, SO-8, and SOT-223. The SOT-223 variant specifically optimizes thermal characteristics while providing significant space savings for surface-mount applications.
Replacement Considerations
Compatible substitutes include other LD1117 variants with identical 1.8 V output and SOT-223-3 packaging, such as LD1117S18T or LD1117S18TR, provided they share the same electrical specifications and pinout compatibility.
