LF90ABDT-TR

Overview

The LF90ABDT-TR is a very low drop voltage regulator (LDO) manufactured by STMicroelectronics. It provides a fixed positive output voltage of 9V with a maximum output current capability of 500mA. The device is housed in a DPAK surface-mount package, specifically the TO-263-3 configuration. Key electrical characteristics include an internal inhibit function for power management and thermal shutdown protection to ensure reliability under overload conditions.

Feature Summary

• Integrated inhibit control pin for precise power sequencing and energy saving
• Built-in thermal shutdown circuitry protects against overheating during fault conditions
• Very low dropout voltage operation allows efficient regulation with minimal input-output differential

Applications

• Battery-powered portable electronic devices requiring efficient linear regulation
• Embedded systems needing stable 9V logic or analog supply rails
• Industrial control modules utilizing surface-mount assembly processes

Procurement Notes

Verify the specific suffix 'TR' indicates tape-and-reel packaging when sourcing from distributors. Confirm the manufacturer part number matches exactly to avoid confusion with through-hole variants like LF90A. Check for RoHS compliance documentation if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when a fixed 9V output at up to 500mA is required in a compact surface-mount form factor. The DPAK package offers better thermal performance than smaller SOT packages. Ensure the input voltage remains within safe operating limits while accounting for dropout voltage requirements.

Part Context

This part belongs to the LFxx series of very low drop voltage regulators from STMicroelectronics. These linear regulators are designed for applications where noise immunity and simple implementation are prioritized over switching converter efficiency. The series typically includes various fixed output voltages and current ratings.

Replacement Considerations

Direct replacements must match the 9V output, 500mA current rating, and DPAK-3 package. Verify that substitute parts also feature the inhibit pin functionality if power control is critical to the design.