What is to-220?

The TO-220 package is a popular type of power semiconductor package which is commonly used for a variety of electronic components such as transistors, voltage regulators, and integrated circuits. The package has three leads, with the center lead being the common connection point, and the outer leads used for input and output connections.

TO stands for "Transistor Outline", and the number 220 indicates the dimensions of the package in thousandths of an inch. The TO-220 package is typically made of metal or ceramic, providing good thermal conductivity for heat dissipation.

The TO-220 package is commonly used in applications where high power dissipation is required, such as in power supplies, motor controls, and voltage regulators. It is known for its durability, ease of mounting, and good thermal performance.

Overall, the TO-220 package is a versatile and widely used package for power electronic components due to its robustness and thermal characteristics.