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MC7812ACTG

ONMC7812ACTG

onsemi
Linear Voltage Regulator IC Positive Fixed 1 Output 1A TO-220
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Overview

The MC7812ACTG is a positive voltage regulator designed to provide a fixed 12V output with a current capacity of up to 1A. It is a robust linear regulator housed in a through-hole TO-220 package, featuring internal thermal overload and short-circuit protection. This component is widely used for on-card regulation to eliminate distribution problems associated with single-point regulation.

Why Choose This Part

The MC7812ACTG offers high reliability through internal short-circuit current limiting and thermal shutdown features. It provides a high power supply rejection ratio of 60dB at 1kHz, ensuring a clean output even with significant input ripple. The TO-220 package allows for easy heatsink attachment to manage thermal dissipation in high-dropout scenarios.

Applications

On-Card Regulation
Used locally on PCBs to provide a stable 12V rail from a higher voltage unregulated source, minimizing noise and voltage drops.
Industrial Power Supplies
Acts as a reliable post-regulator for linear or switching power supplies in industrial control equipment.
Fixed Voltage Reference
Provides a consistent 12V reference for analog circuits and sensor interfaces requiring moderate current.

Key Specifications

PSRR 60dB (1kHz)
Output Type Fixed
Mounting Type Through Hole
Package / Case TO-220-3
Current - Output 1A
Protection Features Over Temperature, Short Circuit
Number of Regulators 1
Output Configuration Positive
Operating Temperature 0degC ~ 125degC
Voltage - Input (Max) 35V
Voltage Dropout (Max) 2V @ 1A (Typ)
Supplier Device Package TO-220
Current - Quiescent (Iq) 6 mA
Voltage - Output (Min/Fixed) 12V

Getting Started

To implement this regulator, connect the input pin to a DC source between 14.8V and 27V, and place a 0.33uF ceramic or tantalum capacitor on the input and a 0.1uF capacitor on the output for stability. Ensure the tab or center pin is connected to ground and evaluate the need for a heatsink based on the power dissipation (Vin - Vout) * Iout. For prototyping, this part is compatible with standard 0.1-inch pitch breadboards and perfboards.