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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 500MA TO220
- 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：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Through Hole
- Package / Case：TO-220-3
- Supplier Device Package：TO-220
- Grade：-
- Qualification：-
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Overview
The LF33ABV is a very low drop voltage regulator manufactured by STMicroelectronics, featuring an inhibit function and low quiescent current. It provides a fixed output voltage of 3.3 V with a maximum output current of 0.5 A. The device exhibits a typical voltage drop of 0.45 V. It operates within an input voltage range of -0.5 to 40 V and supports logic-controlled electronic shutdown. The component is housed in a TO-220 package and is designed for low-noise, low-power applications, particularly in battery-powered systems.
Feature Summary
- Very low dropout voltage capability
- Logic-controlled electronic shutdown function
- Low quiescent current consumption
Applications
- Battery-powered systems
- Low-noise power supply circuits
- Low-power embedded applications
Procurement Notes
Verify the specific suffix (e.g., DG) against the datasheet to confirm package type and temperature grade. Ensure the inhibit pin configuration matches the system design requirements. Confirm lead times and authenticity through authorized STMicroelectronics distributors or certified agents. Check for RoHS compliance status if required by local regulations.
Selection Notes
Select this component when a fixed 3.3 V output is required with minimal voltage headroom. The TO-220 package suits applications requiring higher thermal dissipation compared to surface-mount options. Consider the inhibit feature for power management strategies. Verify that the 0.5 A current limit meets the load requirements without exceeding thermal constraints.
Part Context
This part belongs to the LFXX series of very low drop regulators from STMicroelectronics. The series offers various output voltages and features optimized for efficiency in portable electronics. The LF33ABV specifically targets applications needing stable regulation with minimal power loss across the pass element under varying load conditions.
Replacement Considerations
Direct substitutes include other LF33 variants from STMicroelectronics with compatible pinouts and electrical characteristics. Cross-reference with equivalent LDOs offering 3.3 V output and similar current ratings from other manufacturers, ensuring package compatibility and thermal performance match.
FAQ
What is the purpose of the inhibit function in the LF33ABV?
The inhibit function allows for logic-controlled electronic shutdown of the regulator, enabling power management and reducing quiescent current consumption when the output is not needed.
What is the typical voltage drop of the LF33ABV?
The typical voltage drop is 0.45 V, making it suitable for applications where the input voltage is close to the desired output voltage.
