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Product Detailed Parameters
- Description：IC REG LINEAR 5V 100MA SOT23-5
- 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：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 LD2981CM50TR is a fixed-output low-dropout (LDO) linear voltage regulator manufactured by STMicroelectronics. It provides a stable 5 V output with a maximum load current of 100 mA. The device operates within an input voltage range up to 16 V and features a typical dropout voltage of 375 mV at full load. It incorporates logic-controlled electronic shutdown via the inhibit pin, reducing quiescent current to less than 1 μA in off mode. The component is housed in a surface-mount SOT-23-5 package and is rated for operation between -40 °C and +125 °C.
Feature Summary
- Ultra-low dropout voltage capability ensures efficient regulation even with minimal input-to-output differential.
- Logic-controlled electronic shutdown function allows for system standby modes with negligible power consumption.
- Designed for stability with low ESR ceramic capacitors, supporting compact board layouts.
Applications
- Battery-powered portable electronics requiring low noise and extended runtime
- Cellular phones and personal digital assistants (PDAs)
- Palmtop and laptop computer subsystems
Procurement Notes
Verify the specific suffix 'CM' against the manufacturer's official datasheet to confirm the exact output tolerance and package variant. Ensure the ordering part number matches the required SOT-23-5 configuration. Cross-reference the document revision date to guarantee compatibility with current manufacturing standards and RoHS compliance requirements.
Selection Notes
Select this component when a fixed 5 V rail is required with moderate current demands up to 100 mA. It is suitable for designs prioritizing low quiescent current and fast transient response. Consider the SOT-23-5 footprint constraints and thermal dissipation capabilities relative to the expected load current and ambient temperature conditions.
Part Context
This part belongs to the LD2981 series of ultra-low drop voltage regulators from STMicroelectronics. The series is characterized by very low quiescent current and high power supply rejection ratio (PSRR). Other variants in the family offer different fixed output voltages such as 2.5 V, 3.0 V, and 3.3 V, sharing similar electrical characteristics and package options.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with alternative LDOs based on pinout, voltage rating, and current capacity before substitution.
