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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 500MA DPAK
- 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)：0.7V @ 500mA
- Current - Output：500mA
- Current - Quiescent (Iq)：1 mA
- Current - Supply (Max)：12 mA
- PSRR：80dB ~ 65dB (120Hz ~ 65dB)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-252-3, DPAK (2 Leads + Tab), SC-63
- Supplier Device Package：DPAK
- Grade：-
- Qualification：-
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Overview
The LF33CDT-TR is a fixed-output positive low-dropout (LDO) linear regulator manufactured by STMicroelectronics. It provides a stable 3.3 V output with a maximum continuous current capability of 0.5 A. The device operates within an input voltage range from -0.5 V to 40 V. Key electrical specifications include a typical dropout voltage of 0.45 V and a low quiescent current, which supports efficient power management in battery-operated systems. The component is housed in a DPAK package with three pins (2+Tab) and is supplied in tape-and-reel format.
Feature Summary
- Provides a fixed 3.3 V regulated output for sensitive electronic circuits
- Features very low dropout voltage suitable for minimal voltage headroom applications
- Designed with low quiescent current to enhance efficiency in power-constrained environments
Applications
- Battery-powered portable devices requiring low noise and low power consumption
- Systems utilizing delayed turn-on sequences for controlled power-up
- Multi-rail power supplies incorporating on-off switching capabilities
- Low-voltage indicator circuits such as bulb blinkers
Procurement Notes
Verify the specific suffix 'DT' indicates the DPAK surface-mount package configuration. Confirm the 'TR' designation corresponds to the standard tape-and-reel packaging format required for automated assembly processes. Ensure compatibility with the intended thermal dissipation requirements given the 0.5 A output current rating.
Selection Notes
Select this component when a fixed 3.3 V rail is required with high current capacity up to 0.5 A. It is appropriate for designs prioritizing low dropout performance and low static current consumption. Consider the DPAK package constraints for thermal management and PCB layout space compared to smaller SOT packages.
Part Context
This part belongs to the LFXX series of very low drop regulators from STMicroelectronics. The series offers various fixed output voltages optimized for low-noise and low-power applications. The LF33CDT-TR specifically addresses needs for higher current delivery while maintaining the efficiency benefits characteristic of the broader LF family.
Replacement Considerations
Cross-reference with other LF33 variants from STMicroelectronics that share the same electrical characteristics but differ in package type or reel quantity. Verify pinout compatibility before substituting with generic LDO equivalents.
