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Voltage regulator 7805

🛠️ Voltage Regulator – 7805 (5 V, 1 A)

Overview

The 7805 is a three-terminal linear voltage regulator that outputs a stable +5 V DC from a higher input voltage (typically 7–35 V). It can provide up to 1 A of current, with internal protections such as over-current limiting, thermal shutdown, and safe operating area protection. Widely used for powering microcontrollers, sensors, and small electronics projects.

Key Features

  • Fixed output voltage: +5 V DC

  • Maximum output current: 1 A (some versions up to 1.5 A with heatsink) 

  • Input voltage range: ~7 V to 35 V

  • Internal short-circuit and thermal overload protection

  • Low quiescent current (~5 mA)

  • Standard TO‑220 package; variants available in TO‑92 and SOT‑223

Typical Wiring with Capacitors

Vin    → 7805 IN
GND    → 7805 GND
Vout   → 7805 OUT (regulated 5 V)

  • Place 0.33 µF capacitor from IN to GND close to the regulator

  • Place 0.1 µF capacitor from OUT to GND close to the regulator

  • Heatsink recommended if outputting high current or using high dropout voltage 

Applications

  • Regulated 5 V power for Arduino, sensors, modules

  • Small linear power supplies and LED drivers

  • Post-regulation after switching supplies

  • Educational electronics and prototype breadboard circuits

✅ Resources


  2. 🎥 YouTube Tutorial: How to power your Arduino project with a L7805 — wiring, capacitor placement, and heatsinking alldatasheet.com+12youtube.com+12youtube.com+12

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Regulators