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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 LF33ABDT-TR is a surface-mount linear voltage regulator from the LF33 series, manufactured by STMicroelectronics. It provides a fixed positive output of 3.3 V with a maximum output current of 0.5 A. The device features a very low dropout voltage of 0.45 V and a quiescent current of 0.5 mA. It operates within an input voltage range of -0.5 V to 40 V and supports junction temperatures up to 125 °C. The component is housed in a 3-pin DPAK package measuring 6.6 mm in length, 6.2 mm in width, and 2.4 mm in height. It meets automotive qualification standards under AEC-Q100.
Feature Summary
- Very low dropout voltage enables efficient operation even when input voltage is close to the output level.
- Low quiescent current design minimizes power consumption, extending battery life in portable devices.
- Automotive-grade reliability ensures stable performance under harsh environmental conditions.
Applications
- Multi-output power supplies requiring sequential regulation
- Battery-powered systems prioritizing low noise and low power
- Low-dropout voltage regulation for sensitive electronic circuits
Procurement Notes
Verify that the specific part number matches the required automotive grade (AEC-Q100) and package type (DPAK). Confirm the manufacturer is STMicroelectronics to ensure authenticity. Check datasheet specifications for thermal resistance and operating temperature limits relevant to your application environment before finalizing procurement decisions.
Selection Notes
Select this component when a fixed 3.3 V output is needed with high efficiency at low voltage differentials. The 0.5 A current capability suits moderate load applications. Consider the DPAK package for its thermal performance compared to smaller SOT packages. Ensure the input voltage does not exceed the 40 V maximum rating during transient events.
Part Context
This regulator belongs to the LFxx family of very low drop regulators available in various output voltages. The LF33 variant specifically targets 3.3 V applications. The 'DT' suffix indicates the DPAK surface-mount package, while '-TR' denotes tape and reel packaging for automated assembly processes.
Replacement Considerations
Public confirmed substitute part numbers are not provided in the source material. Verify compatibility with alternative LDOs based on pinout, voltage, and current ratings if substitution is necessary.
