An antifuse is an electrical device that performs the opposite function to a fuse. Whereas a fuse starts with a low resistance and is designed to permanently break or open an electrically conductive path (typically when the current through the path exceeds a specified limit), an antifuse starts with a high resistance—an open circuit—and programming it converts it into a permanent electrically conductive path (typically when the voltage across the antifuse exceeds a certain level).[1] This technology has many applications. Antifuses are best known for their use in mini-light (or miniature) style low-voltage Christmas tree lights.