L7809CV

Overview

The L7809CV is a fixed-output positive linear voltage regulator belonging to the 78xx series. It provides a regulated 9V output with a maximum load current of 1.5A. The device operates within an input voltage range typically up to 35V and maintains regulation over a junction temperature range of -40°C to +125°C. It features internal thermal overload protection, short-circuit current limiting, and safe area protection. The component is housed in a TO-220 package, suitable for through-hole mounting on printed circuit boards.

Feature Summary

• Fixed 9V DC output voltage
• Internal thermal overload protection
• Short-circuit current limiting
• TO-220 through-hole package

Applications

• General-purpose power supply circuits
• Embedded system voltage regulation
• Industrial control equipment power stages

Procurement Notes

Verify manufacturer origin as multiple entities produce this standard part number. Confirm package type matches TO-220 requirements. Check datasheet for specific current derating curves at elevated temperatures. Ensure supplier documentation aligns with required operating temperature range specifications.

Selection Notes

Select based on required 9V output and 1.5A current capacity. Consider thermal management needs due to power dissipation differences between input and output voltages. Verify compatibility with existing PCB footprint for TO-220 packages. Evaluate input voltage stability to ensure it remains within safe operating limits.

Part Context

Part of the widely used 78xx series of three-terminal positive regulators. Commonly substituted by LM7809 or MC7809 variants. Standard component for low-cost, fixed-voltage regulation applications where high efficiency is not the primary design constraint compared to simplicity and reliability.

Replacement Considerations

LM7809, MC7809, TA7809K. Verify pinout compatibility (Input, Ground, Output) before substitution. Ensure replacement package matches physical mounting constraints.