This is one of the regulator types.
Part Number : 7812CT, MC7812CT
Function : 12V, Voltage Regulator
Package : TO-220, D-PAK Type
Manufactures : Fairchild, ON Semiconductor
See the preview image and the PDF file for more information.
The 78XX series, 7812CT of three-terminal positive regulators is available in the TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut-down, and safe operating area protection. If adequate heat sinking is provided, they can deliver over 1 A output current. Although designed primarily as fixedvoltage regulators, these devices can be used with external components for adjustable voltages and currents. […]
1. Output Current up to 1 A
2. Output Voltages : 12 V
3. Thermal Overload Protection
4. Short-Circuit Protection
5. Output Transistor Safe Operating Area Protection