L7809ABD2T

Overview

The L7809ABD2T is a three-terminal positive linear voltage regulator from the STMicroelectronics L78 series, housed in a D2PAK surface-mount package. It provides a fixed output voltage of 9 V with a maximum output current capability of 1.5 A. The device accepts an input voltage range from a minimum of 11 V to a maximum of 35 V. It operates within a temperature range of -40 °C to +125 °C and features a typical static current of 4.3 mA. Line regulation is specified at 80 mV, load regulation at 100 mV, and power supply rejection ratio (PSRR) is typically 62 dB.

Feature Summary

• Integrates internal current limiting, thermal shutdown, and safe area protection for robust operation under fault conditions.
• Provides local on-card regulation to eliminate distribution problems associated with single-point regulation systems.
• Capable of delivering high output currents exceeding 1 A when adequate heat sinking is provided.

Applications

• High output current circuits requiring short circuit protection
• Voltage regulators for light controllers
• High input voltage circuit configurations

Procurement Notes

Verify the specific suffix 'D2T' against the manufacturer's official datasheet to confirm the exact tape-and-reel packaging quantity and orientation. Ensure the ordering part number matches the required D2PAK footprint and pinout configuration for your PCB design. Cross-reference the revision level to guarantee compatibility with existing assembly processes.

Selection Notes

Select this component when a fixed 9 V output is required with up to 1.5 A load capacity in a surface-mount form factor. The D2PAK package offers superior thermal dissipation compared to smaller SOT packages, supporting higher current loads. Verify that the input voltage remains within the 11 V to 35 V range to maintain proper regulation and prevent damage.

Part Context

This component belongs to the L78 series of three-terminal positive regulators, which are widely used for general-purpose linear regulation. The series includes various packages such as TO-220, TO-220FP, DPAK, and D2PAK, offering flexibility for different power and space requirements. The L7809ABD2T specifically utilizes the D2PAK package for enhanced thermal performance in surface-mount applications.

Replacement Considerations

Compatible substitutes include other L78 series devices in D2PAK packages with identical 9 V output and 1.5 A current rating, such as the L7809CD2T or equivalent parts from other manufacturers offering pin-compatible D2PAK linear regulators with similar electrical specifications.