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Product Detailed Parameters
- Description：IC REG LINEAR 1.2V 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)：1.2V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.3V @ 800mA
- Current - Output：800mA
- Current - Quiescent (Iq)：5 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 LD1117S12CTR is a fixed low-dropout positive voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 1.2 V with a maximum output current capability of 800 mA. The device operates with a maximum input voltage of 15 V and features a typical dropout voltage of 1 V. It utilizes an SOT-223 surface-mount package with three pins. The unit maintains an output voltage tolerance of ±1% at 25°C and supports a maximum operating temperature of +125°C.
Feature Summary
- Low dropout voltage performance for efficient power regulation
- Internal current limiting and thermal shutdown protection mechanisms
- High supply voltage rejection ratio for noise immunity
- Requires only a minimal 10 μF capacitor for stability
Applications
- Battery-powered systems requiring efficient step-down regulation
- Post-regulation stages for switching power supplies
- Portable equipment with strict space constraints
- General-purpose linear regulation in embedded circuits
Procurement Notes
Verify the specific suffix 'CTR' to confirm the SOT-223-3 surface mount package configuration and reel packaging format. Ensure the design accounts for thermal dissipation limits inherent to the small outline transistor package under full load conditions. Confirm that the 1.2 V fixed output aligns precisely with target rail requirements, as adjustable variants exist within the same series.
Selection Notes
Select this component when a stable 1.2 V rail is required with up to 800 mA load current. The SOT-223 package offers a balance between thermal performance and board space efficiency compared to through-hole options. Consider the 1 V typical dropout voltage when determining the minimum required input voltage headroom for the application's operating range.
Part Context
This part belongs to the LD1117 family of low-dropout regulators from STMicroelectronics. The family includes both fixed and adjustable versions available in various packages such as DPAK, SO-8, and TO-220. The LD1117 series is designed for applications requiring high efficiency and tight voltage tolerance, utilizing an NPN pass transistor architecture.
Replacement Considerations
Direct pin-compatible substitutes include other LD1117 variants with different fixed output voltages or adjustable versions. Cross-manufacturer equivalents may require verification of pinout compatibility and thermal characteristics.
