L7812CV 12V Positive Linear Voltage Regulator IC (TO-220)
Electronic Components
₹45
The L7812CV is a highly reliable three-terminal positive linear voltage regulator. It takes a higher unregulated input voltage (between 14.5V and 35V) and outputs a perfectly stable 12V DC. It is an essential component for powering 12V motors, relays, and sensors from higher voltage power sources like a 24V industrial supply or a 4S LiPo battery.
Overview
The L7812CV is the 12V version of the famous 78xx series of linear voltage regulators. If you are building a custom robotics platform, a 3D printer, or an industrial IoT node that runs on a 24V power supply, you will often need a clean, stable 12V line to drive specific motors, LED arrays, or mechanical relays. The L7812CV provides exactly that.
Because it is a linear regulator, it introduces zero high-frequency switching noise into your circuit, making it an excellent choice for powering sensitive analog or audio equipment that requires 12V.
Technical Specifications
| Feature | Specification |
|---|---|
| Output Voltage | +12V DC |
| Input Voltage Range | 14.5V to 35V DC |
| Maximum Output Current | 1.5A (with adequate heat sink) |
| Dropout Voltage | ~2V (Input must be at least 14.5V to get 12V out) |
| Quiescent Current | ~5 mA to 8 mA |
| Operating Temperature | 0°C to +125°C |
| Package Type | TO-220 (Through-hole, Breadboard friendly) |
Pinout Configuration
Holding the component with the flat side and text facing you, and the pins pointing down, the pinout from left to right is:
- Input (Vin): Connect to your unregulated positive power supply (e.g., +24V).
- Ground (GND): Connect to the common ground of your circuit.
- Output (Vout): The regulated +12V output.
Usage Guidelines & Best Practices
- Decoupling Capacitors: To ensure a smooth 12V output and prevent oscillation, place a 0.33µF ceramic capacitor between the Input pin and Ground, and a 0.1µF ceramic capacitor between the Output pin and Ground. Keep these as close to the IC pins as possible.
- Thermal Management: Linear regulators dissipate excess voltage as heat. For example, if you drop 24V down to 12V while drawing 1 Amp, the IC must dissipate 12 Watts of heat. For high-current or high-voltage-drop scenarios, a standard TO-220 aluminum heatsink is absolutely mandatory to prevent thermal shutdown.
