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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 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)：3.3V
- 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 LD2981CU33TR is a fixed-output positive low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 3.3 V with a maximum output current of 100 mA. The device operates within an input voltage range from 2.5 V to 16 V and features a typical dropout voltage of 1 mV at 1 mA load, with a maximum specified dropout of 375 mV at full load. Quiescent current is typically 100 µA in active mode. It utilizes a SOT-89-3 surface-mount package and supports an operating temperature range from -40 °C to +125 °C.
Feature Summary
- Logic-controlled electronic shutdown via inhibit pin for standby power reduction
- Designed for stability with low ESR ceramic output capacitors
- Integrated internal current limiting and thermal overload protection
Applications
- Battery-powered portable systems requiring low quiescent current
- Cellular phones and personal digital assistants (PDAs)
- Laptop computers and palmtop devices
Procurement Notes
Verify the specific suffix 'CU' indicates the SOT-89-3 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure input voltage does not exceed the 16 V absolute maximum rating during operation to prevent device damage.
Selection Notes
Select this component for applications requiring a fixed 3.3 V rail with minimal footprint. The SOT-89-3 package offers a compact solution compared to larger regulators. Consider the 100 mA current limit when designing for peak load scenarios. Verify compatibility with low ESR ceramic capacitors to ensure loop stability.
Part Context
This part belongs to the LD2981 series of ultra-low drop voltage regulators. The series includes variants with different output voltages and packages, such as the SOT-23-5. The CU suffix specifically denotes the fixed 3.3 V output version housed in the SOT-89-3 package, distinguishing it from adjustable or other fixed voltage options within the same family.
Replacement Considerations
Cross-reference with LD2981CM33TR for SOT-23-5 package alternatives. Verify electrical parameters against LD2981ABM33TR if higher accuracy is required. Ensure pinout compatibility before substituting.
