LM7805CT

Product Overview

The LM7805CT from Fairchild Semiconductor is a positive, fixed-output linear voltage regulator intended for single-output 5 V regulation. It is supplied in a through-hole TO-220-3 package and can deliver up to 1.5 A. The device accepts a maximum input voltage of 35 V, with dropout specified as 2 V at 1 A (typical). Its operating temperature range is -40°C to 125°C, and protection features include over-temperature and short-circuit conditions.

Key Features

• Positive fixed-output linear regulator with a single 5 V output
• 1.5 A output current capability
• Maximum input voltage of 35 V
• Voltage dropout specified as 2 V at 1 A (typical)
• Quiescent current of 8 mA
• PSRR of 73 dB at 120 Hz
• Over-temperature and short-circuit protection
• Operating temperature range of -40°C to 125°C
• Through-hole mounting in a TO-220-3 package

Applications

• Regulated 5 V supply rails for embedded control boards
• 5 V intermediate power bus for peripheral circuits
• Fixed 5 V regulation in development and prototyping power supplies

Design & Procurement Notes

When selecting the LM7805CT, verify that the input voltage remains at or below 35 V and that sufficient headroom exists above the 5 V output, since dropout is specified as 2 V at 1 A (typical). The 1.5 A output rating and through-hole TO-220-3 package should be considered together with board-level thermal design. The 8 mA quiescent current and 73 dB PSRR at 120 Hz should be checked against system power and noise requirements. The -40°C to 125°C operating range should be checked against the intended ambient conditions, while over-temperature and short-circuit protection should be reviewed within the overall power architecture.