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Product Detailed Parameters
- Description：IC REG LINEAR 4V 200MA SOT23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：14V
- Voltage - Output (Min/Fixed)：4V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.5V @ 200mA
- Current - Output：200mA
- Current - Quiescent (Iq)：250 µA
- Current - Supply (Max)：-
- PSRR：55dB (400Hz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：SC-74A, SOT-753
- Supplier Device Package：SOT-23-5
- Grade：-
- Qualification：-
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Overview
The LK112SM40TR is a low-dropout linear regulator manufactured by STMicroelectronics, featuring a fixed 4.0 V output and a maximum load current of 200 mA. It operates within an input voltage range of 4.5 V to 14 V and maintains a maximum dropout voltage of 500 mV at full load. The device incorporates shutdown functionality controlled by TTL or CMOS logic levels, reducing quiescent current to 100 nA in the OFF state. It provides high accuracy with a voltage tolerance of ±2% at 25 °C and includes internal thermal and current limiting protections.
Feature Summary
- Integrated shutdown control compatible with standard logic levels for power management
- Low noise performance with bypass pin capability for sensitive analog circuits
- Internal protection against overcurrent and excessive junction temperature
Applications
- Battery-powered portable devices requiring efficient voltage regulation
- Noise-sensitive analog signal processing stages
- Embedded systems utilizing microcontrollers with specific voltage requirements
Procurement Notes
Verify the exact suffix designation against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with the intended PCB footprint, specifically the SOT-23-5 package dimensions. Confirm that the fixed 4.0 V output aligns with the target circuit design requirements before procurement.
Selection Notes
Select this component when a stable 4.0 V supply is required with minimal voltage drop across the regulator. Consider the low quiescent current for battery life optimization and the shutdown feature for system power control. Verify that the input voltage remains within the specified operational range to ensure proper regulation and protection activation.
Part Context
This part belongs to the LK112S series of low-noise low-dropout regulators from STMicroelectronics. The series is characterized by its ability to deliver up to 200 mA with high precision and low power consumption. The LK112SM40TR variant specifically offers a fixed 4.0 V output, distinguishing it from other adjustable or fixed-voltage options within the same family.
Replacement Considerations
Consult official cross-reference lists for verified substitutes. Ensure any replacement matches the 200 mA current rating, 4.0 V output, and SOT-23-5 package. Verify functional equivalence regarding shutdown logic and noise performance characteristics.
