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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 500MA PPAK
- Series：-
- Mfr：STMicroelectronics
- Package：Tube
- 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)：0.7V @ 500mA
- Current - Output：500mA
- Current - Quiescent (Iq)：1 mA
- Current - Supply (Max)：12 mA
- PSRR：80dB ~ 65dB (120Hz ~ 65dB)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-252-5, DPAK (4 Leads + Tab), TO-252AD
- Supplier Device Package：PPAK
- Grade：-
- Qualification：-
Download product information
Overview
The LF33CPT is a fixed low-dropout (LDO) linear voltage regulator manufactured by STMicroelectronics, designed to provide a stable 3.3 V output from an input voltage range of up to 16.0 V DC. It supports a maximum output current of 500 mA with a typical dropout voltage of 400 mV at full load. The device features a ±2% output voltage tolerance and operates within an extended temperature range of -40°C to +125°C. Packaged in a surface-mount TO-252-5 (DPAK) format with five pins, it integrates inhibit functionality for power management control.
Feature Summary
- Very low dropout voltage operation ensures high efficiency under minimal input-output differential conditions
- Integrated inhibit pin allows precise control over regulator enablement and power consumption
- Fixed 3.3 V output provides stable regulation without external feedback components
- Robust thermal performance in compact surface-mount packaging suitable for space-constrained designs
Applications
- Battery-powered portable electronics requiring efficient step-down regulation
- Embedded systems needing stable 3.3 V logic supply rails
- Industrial control modules with wide input voltage variations
- Communication equipment requiring low-noise linear regulation
Procurement Notes
Verify the exact part marking and package variant against official STMicroelectronics documentation before procurement. Confirm that the TO-252-5 pinout matches your PCB layout requirements. Ensure compliance with RoHS directives if applicable. Cross-reference ordering codes such as LF33CPT versus LF33CPT-TR to confirm tape-and-reel versus tube packaging distinctions specified in the datasheet.
Selection Notes
Select this component when a fixed 3.3 V output with 500 mA capability is required in a DPAK package. Consider the 400 mV dropout characteristic for applications where input voltage closely approaches the output level. Evaluate thermal dissipation needs based on expected load current and ambient temperature conditions within the -40°C to +125°C operating range.
Part Context
The LF33CPT belongs to STMicroelectronics’ LFxxAB/LFxxC series of very low drop voltage regulators. This family includes variants available in multiple packages including PENTAWATT, TO-220, TO-220FP, DPAK, and PPAK. The LF33CPT specifically utilizes the DPAK (TO-252-5) form factor, distinguishing it from through-hole or larger surface-mount alternatives within the same functional family.
Replacement Considerations
Publicly confirmed substitute part numbers are not explicitly documented in the provided source material. Users should consult STMicroelectronics’ official replacement guide or contact technical support for validated cross-references.
