L7809ACV

Overview

The L7809ACV is a three-terminal positive linear voltage regulator from the STMicroelectronics L78xx series. It provides a fixed 9 V output with a maximum continuous current of 1 A. The device accepts an input voltage up to 35 V and operates within a temperature range of 0°C to 150°C. Key electrical parameters include a line regulation of 50 mV, load regulation of 100 mV, and a typical power supply rejection ratio (PSRR) of 68 dB. It features a TO-220-3 through-hole package.

Feature Summary

• Integrated internal current limiting, thermal shutdown, and safe area protection for robust operation.

Applications

• Local on-card voltage regulation
• General-purpose DC-to-DC conversion

Procurement Notes

Verify the specific suffix against official datasheets to confirm exact performance grades and packaging variations. Ensure that ordering codes match the required tolerance and thermal characteristics. Confirm RoHS compliance status directly with manufacturer documentation prior to procurement.

Selection Notes

Select this component when a fixed 9 V rail is required at currents up to 1 A. Consider the thermal dissipation requirements inherent to linear regulation topologies. Verify that the input voltage remains within the specified 35 V maximum limit under all operating conditions.

Part Context

This part belongs to the L78xx family of three-terminal positive regulators. The series offers various fixed output voltages in packages such as TO-220, D2PAK, and DPAK. These devices are designed to eliminate distribution problems associated with single-point regulation by providing local control.

Replacement Considerations

Compatible substitutes include other manufacturers' equivalents in the 7809 category, such as MC7809 or LM7809, provided they meet the same pinout, voltage, and current specifications.