LM7812 / L7812CV Positive Voltage Regulator (Fixed 12V - TO-220 Package)

When your project demands a stable, noise-free 12-Volt power rail, the LM7812 is the definitive industry-standard solution. Part of the iconic 78xx series of fixed-voltage linear regulators, this three-terminal integrated circuit is designed to take a higher, fluctuating DC input voltage and step it down to a precise, continuous 12-Volt output. Because it is a linear regulator, it provides exceptionally clean power with virtually zero high-frequency switching noise, making it highly favored for sensitive audio equipment, radio telemetry, and precision instrumentation.

Housed in the standard, robust TO-220 through-hole package, the LM7812 can comfortably deliver up to 1.5 Amps of output current. It features an integrated heavy metal backing tab designed to bolt directly onto an aluminum heatsink or chassis, allowing it to safely shed excess voltage as thermal energy. With zero external configuration components required other than standard smoothing capacitors, it offers an absolute foolproof method for implementing a local on-board 12-Volt regulation zone.

Key Features & Functional Advantages

• Fixed 12-Volt Output: Factory-trimmed to output exactly 12 Volts, completely eliminating the need for external voltage-setting resistors and simplifying your PCB layout.

• 1.5 Amp Current Rating: Capable of supplying over 1.5 Amps of continuous current when paired with an adequate thermal management system.

• Low-Noise Linear Architecture: Does not generate the electromagnetic interference (EMI) or high-frequency ripple typical of buck switching converters, protecting clean analog signals.

• Comprehensive Internal Safety: Equipped with built-in thermal overload protection, internal short-circuit current limiting, and output transistor safe-area compensation to make it virtually indestructible.

• Drop-In Simplicity: Requires only an input pin, a ground pin, and an output pin, significantly lowering the overall component count of your power supply module.

Perfect For

• 12V Relay and Solenoid Drivers: Providing the clean, dedicated high-current rail needed to reliably throw electromagnetic relays and actuators without sagging logic rails.

• Audio Amplifiers and Mixers: Powering operational amplifier stages and small audio power amplifiers where power supply hum and high-frequency noise must be minimized.

• Industrial Control Systems: Stepping down standard 24-Volt industrial supply lines down to a steady 12 Volts for localized sensors and interface circuitry.

• Hobbyist Bench Power Supplies: Acting as the fixed 12-Volt tap in multi-rail DIY laboratory power supplies.

Technical Specifications

• Device Type: Standard Linear Voltage Regulator

• Output Type: Fixed Positive

• Output Voltage: 12.0 Volts DC

• Input Voltage Range: 14.5 Volts to 35.0 Volts DC

• Maximum Output Current: 1.5 Amps

• Voltage Drop-Out: Typically 2.0 Volts (Requires input to be at least 14.0V to 14.5V to stay in regulation)

• Package Type: 3-Pin TO-220 (Vertical through-hole with metal heatsink tab)

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