LF33ABDT

Overview

The LF33ABDT-TR is a 3.3V sequential very low drop voltage regulator (LDO) from STMicroelectronics, designed for low-noise and low-power applications. It features a maximum input voltage of 16V and an output current capability of 0.5A. The device operates with a low dropout voltage of 0.45V and a quiescent current of 0.5mA. It supports an input voltage range from -0.5V to 40V in specific configurations but is rated for 16V continuous operation. The component is housed in a surface-mount package measuring 6.2mm x 6.6mm x 2.4mm with three pins. It is qualified under the AEC-Q100 automotive standard and functions reliably up to a maximum operating temperature of 125°C.

Feature Summary

• Provides stable 3.3V output with ultra-low dropout characteristics suitable for battery-powered systems
• Features low quiescent current and low noise performance for sensitive electronic circuits
• Includes an integrated on-off switch functionality for power management control
• Qualified for automotive applications meeting AEC-Q100 reliability standards

Applications

• Multi-output power supplies requiring sequential regulation
• Low-noise analog circuit power conditioning
• Battery-operated portable devices prioritizing energy efficiency

Procurement Notes

Verify the complete part number includes the -TR suffix for tape-and-reel packaging when ordering. Confirm that the application design accounts for the 16V maximum input voltage rating rather than the broader -0.5V to 40V transient range. Ensure thermal management strategies align with the 125°C maximum junction temperature specification. Check for AEC-Q100 compliance requirements if deploying in automotive environments. Validate pinout compatibility with the SOT-23 or similar surface-mount footprint dimensions provided.

Selection Notes

Select this component when a fixed 3.3V output with minimal voltage drop is required for low-current loads up to 0.5A. It is appropriate for designs where low static current consumption is critical for extending battery life. Consider this regulator for space-constrained applications due to its compact 3-pin surface-mount package. It serves as a suitable replacement for older linear regulators requiring lower dropout performance in portable electronics.

Part Context

The LF33ABDT belongs to the LFxx series of very low drop regulators manufactured by STMicroelectronics. This series offers various fixed output voltages tailored for low-power and low-noise applications. The device utilizes LDO topology to efficiently step down input voltages while maintaining regulation. It is part of ST's broader portfolio of power management ICs designed for consumer, industrial, and automotive sectors.

Replacement Considerations

Direct substitutes within the LFxx family include other voltage variants such as LF18 or LF25 depending on required output levels. Verify pin compatibility and thermal characteristics when cross-referencing with generic LDO components. Ensure any replacement maintains the 0.5A output current capability and low dropout specifications.