L7809CD2T

Overview

The L7809CD2T is a fixed positive linear voltage regulator from the STMicroelectronics L78 series, designed for general-purpose applications. It provides a stable 9 V output with a maximum load current of 1.5 A. The device features internal current limiting, thermal shutdown, and safe area protection to ensure robust operation under fault conditions. It is housed in a D2PAK surface-mount package, suitable for automated assembly processes.

Feature Summary

• Fixed 9 V output voltage regulation
• Integrated thermal overload protection
• Internal short-circuit current limiting

Applications

• General-purpose power supply circuits
• Local on-card regulation
• Embedded system power management

Procurement Notes

Verify the specific suffix 'D2T' against the manufacturer's official datasheet to confirm the exact package type and tape-and-reel configuration. Ensure compatibility with the intended PCB footprint and soldering profile for the D2PAK-3 package before finalizing procurement orders.

Selection Notes

Select this component when a fixed 9 V rail is required with up to 1.5 A capacity in a surface-mount form factor. Consider the input-to-output voltage differential to manage power dissipation within the thermal limits of the D2PAK package. Verify that the application does not require adjustable voltage or negative polarity outputs.

Part Context

This part belongs to the L78xx family of three-terminal positive linear regulators. These devices are widely used for their simplicity and reliability in converting higher unregulated voltages to stable lower DC levels. The L78 series is known for its built-in protections and ease of use without external feedback components.

Replacement Considerations

Compatible replacements include other L7809 variants from different manufacturers offering identical electrical specifications and pinouts. Ensure any substitute matches the D2PAK-3 package dimensions and thermal characteristics to maintain mechanical and thermal integrity in the existing design.