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Product Detailed Parameters
- Description：IC REG LINEAR 5V 100MA SOT89-3
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：16V
- Voltage - Output (Min/Fixed)：5V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.375V @ 100mA
- Current - Output：100mA
- Current - Quiescent (Iq)：150 µA
- Current - Supply (Max)：2.6 mA
- PSRR：63dB (1kHz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-243AA
- Supplier Device Package：SOT-89-3
- Grade：-
- Qualification：-
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Overview
The LD2981CU50TR is a positive fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 5 V output with a maximum continuous current of 100 mA. The device operates within an input voltage range up to 16 V and maintains a typical dropout voltage of 1 mV at light loads, rising to a maximum of 375 mV at full load. It features a low quiescent current of 100 µA in active mode and includes internal overcurrent and thermal shutdown protection. The component is housed in a surface-mount SOT-89-3 package and supports an operating temperature range from -40 °C to +125 °C.
Feature Summary
- Ultra-low dropout voltage capability for efficient power management
- Logic-controlled electronic shutdown function via inhibit pin
- Internal overcurrent and thermal limit protection mechanisms
- Designed for stability with low ESR ceramic output capacitors
Applications
- Battery-powered portable electronic systems
- Cellular phone power regulation
- Personal digital assistant (PDA) circuits
- Camcorder and camera power supplies
Procurement Notes
Verify the specific suffix 'CU' against the manufacturer's official datasheet to confirm the exact output tolerance and package variant. Ensure the ordering code matches the required reel quantity and that the component meets RoHS compliance standards for your target market. Cross-reference the part number with authorized distributors to avoid counterfeit components.
Selection Notes
Select this regulator when a fixed 5 V supply is required with minimal voltage drop across the input-output differential. It is suitable for applications demanding low static power consumption and high noise immunity. Consider the SOT-89-3 package constraints for thermal dissipation and PCB layout requirements compared to other available packages in the series.
Part Context
This component belongs to the LD2981 family of ultra-low drop voltage regulators designed for low-noise and low-power applications. The series offers various fixed output voltages and packaging options, including SOT-23-5L and SOT-89 variants. The CU50 designation specifically identifies the 5 V output version in the SOT-89-3 package format.
Replacement Considerations
Compatible substitutes include the LD2981ABU50TR and LD2981CMU50TR, which share similar electrical characteristics but may differ in output voltage tolerance or package type. Verify pin compatibility and thermal performance before substitution.
