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Product Detailed Parameters
- Description：IC REG LINEAR 1.8V 1A 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 @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：80dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：0°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 LD1117AS18TR 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 1 A. The device operates within a commercial temperature range from 0 °C to 125 °C and utilizes an SOT-223 surface-mount package. Key electrical characteristics include a typical dropout voltage of 1.15 V at 1 A load, a quiescent current of 5 mA, and high supply voltage rejection of 80 dB. Output voltage tolerance is specified at ±2% at 25 °C and ±4% across the full temperature range.
Feature Summary
- Fixed 1.8 V output voltage with 1 A current capacity
- Low dropout voltage performance under full load
- Internal thermal and current limiting protection
- High supply voltage rejection ratio
Applications
- Battery-powered systems requiring efficient voltage regulation
- Post-regulators for switching power supplies
- Embedded logic and peripheral power supplies
Procurement Notes
Verify the specific suffix 'AS' indicates the commercial grade and SOT-223 packaging configuration. Confirm the 'TR' suffix denotes tape and reel packaging format. Ensure the 1.8 V fixed output matches the design requirement. Check for RoHS compliance status via the official datasheet before finalizing procurement specifications.
Selection Notes
Select this component when a stable 1.8 V rail is required with up to 1 A load current in space-constrained designs. The SOT-223 package offers thermal optimization compared to through-hole options. Consider the 1.15 V typical dropout voltage to ensure sufficient input-output differential. Verify that the 0 °C to 125 °C operating range meets the environmental conditions of the target application.
Part Context
This part belongs to the LD1117A series of low-dropout regulators from STMicroelectronics. The series includes adjustable versions and other fixed voltages such as 1.2 V and 3.3 V. The 'A' variant typically denotes improved specifications over the standard LD1117, including tighter voltage tolerances and higher current capability up to 1 A.
Replacement Considerations
Compatible substitutes include the LD1117S18CTR for similar functionality in different packages or grades. Other fixed 1.8 V LDOs from the same family may serve as alternatives if pin compatibility and thermal requirements are met.
