L7805CV

Product Overview

The L7805CV from STMicroelectronics is a linear voltage regulator IC with a positive fixed output. It provides a single 5 V regulator output at up to 1.5 A in a TO-220-3 through-hole package. The device accepts an input voltage up to 35 V and operates from 0°C to 125°C. Over-temperature and short-circuit protection are included, and the regulator is suited to board-level power conversion where a simple fixed positive rail is required.

Key Features

• Positive fixed output configuration with one regulator output set to 5 V.
• Rated output current of 1.5 A for linear regulation of a single positive rail.
• Maximum input voltage of 35 V for operation from higher input supply rails.
• Voltage dropout is 2 V at 1 A (typical).
• Quiescent current of 8 mA.
• Power supply rejection ratio of 62 dB at 120 Hz.
• Integrated protection features include over-temperature and short-circuit response.
• Operating temperature range from 0°C to 125°C in a TO-220-3 through-hole package.

Applications

• Regulated 5 V rails for embedded boards and logic subsystems.
• Post-rectification or battery-derived supply conditioning where a fixed positive voltage is needed.
• Simple linear regulation in instrumentation and test equipment.
• Board-level power distribution for peripherals requiring a 5 V source.

Design & Procurement Notes

Design considerations include input headroom above the 5 V output, since the dropout voltage is 2 V at 1 A typical, and input voltage must remain below the 35 V maximum. Through-hole TO-220-3 mounting supports conventional PCB assembly and thermal management planning. The 0°C to 125°C operating range should be checked against the final enclosure thermal profile. Over-temperature and short-circuit protection reduce the need for external fault circuitry, but output current, thermal dissipation, and input-to-output voltage differences still require verification.