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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 250MA 6-DFN
- Series：ECOPACK®
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：40V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1V @ 250mA
- Current - Output：250mA
- Current - Quiescent (Iq)：5 µA
- Current - Supply (Max)：500 µA
- PSRR：55dB (1kHz)
- Control Features：Current Limit, Enable
- Protection Features：Over Current, Over Temperature, Short Circuit
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：6-WDFN Exposed Pad
- Supplier Device Package：6-DFN (2x2)
- Grade：Automotive
- Qualification：AEC-Q100
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Overview
The LDQ40PU33RY is a fixed-output low dropout linear regulator manufactured by STMicroelectronics, providing a stable 3.3 V output with a maximum load current of 250 mA. It operates within an input voltage range of 3.3 V to 40 V and features a typical dropout voltage of 500 mV at full load. The device exhibits a quiescent current of 500 uA and offers a typical power supply rejection ratio (PSRR) of 55 dB. It is housed in a DFN-6 surface-mount package and supports operation across a temperature range from -40 °C to +150 °C. The component holds AEC-Q100 qualification for automotive reliability.
Feature Summary
- High input voltage tolerance up to 40 V suitable for industrial environments
- Automotive-grade reliability certified under AEC-Q100 standards
- Integrated thermal protection and short-circuit safeguarding mechanisms
Applications
- Automotive electronic control units requiring high-voltage tolerance
- Industrial sensor interfaces and signal conditioning circuits
- Battery-powered systems utilizing wide input voltage ranges
Procurement Notes
Verify the specific suffix 'RY' corresponds to the required tape-and-reel packaging configuration before ordering. Confirm that the DFN-6 footprint matches the target PCB layout dimensions. Ensure the design accounts for the specified thermal dissipation requirements given the operating temperature limits and package type.
Selection Notes
Select this component when a high input voltage capability exceeding standard LDO limits is required alongside automotive qualification. The 250 mA output current is sufficient for moderate load applications. Consider the 500 uA quiescent current impact on overall system efficiency during active operation phases.
Part Context
This part belongs to the LDQ40 series of low dropout regulators designed for robust performance in demanding environments. The series provides various fixed output voltages and an adjustable version, all sharing common protection features and automotive certification. It serves as a key power management solution for applications bridging high-voltage inputs to sensitive low-voltage logic loads.
Replacement Considerations
Consult official substitution lists for verified equivalents. Generic replacements may lack the specific 40 V input rating or AEC-Q100 automotive qualification required for this application.
