L7805

The L7805 is a three-terminal positive linear voltage regulator that provides a stable 5V DC output from a higher voltage source. It is widely used in electronic projects to power microcontrollers, sensors, and other 5V logic circuits.
Key Technical Specifications (2026)
Output Voltage: Fixed 5V DC.
Output Current: Up to 1.5A (when properly heat-sinked).
Input Voltage Range: Typically 7V to 35V. A minimum of 7V is required to maintain regulation (dropout voltage is about 2V).
Package Types: Most commonly found in the TO-220 through-hole package, but also available in D²PAK and DPAK surface-mount formats.
Built-in Protection: Includes thermal overload protection, short-circuit protection, and safe area (SOA) protection.
Pin Configuration (TO-220 Package)
Pin 1 (Input): Connects to the unregulated positive voltage source (7V–35V).
Pin 2 (Ground): Connects to the circuit’s common ground.
Pin 3 (Output): Provides the regulated +5V output.
Usage & Availability
Applications: Essential for local on-card regulation, eliminating noise issues from single-point regulation in systems like Arduino projects, industrial automation, and automotive accessories.
Efficiency Note: Because it is a linear regulator, it dissipates excess voltage as heat. If the input voltage is much higher than 5V (e.g., 24V input), a heat sink is mandatory to prevent thermal shutdown.