Electrostatic discharge protection apparatus having at least on junction and method for operating the same

A method for operating an ESD protection apparatus, comprising:

• providing an ESD protection apparatus electrically connected to an internal circuit, the ESD protection apparatus comprising:
• a semiconductor substrate;
• a first well having a first conductivity, disposed in the semiconductor substrate;
• a second well having a second conductivity, disposed in the semiconductor substrate;
• a first doping region having the first conductivity and disposed in the first well;
• a second doping region having the second conductivity and disposed in the first well;
• a third doping region having the first conductivity, disposed in the second well;
• a fourth doping region having the second conductivity, disposed in the second well;
• a first junction formed by the first doping region and the second doping region;
• and
• a second junction formed by the third doping region and the fourth doping region,
• wherein at least one of the first doping region, the second doping region, the third doping region and the fourth doping region is in a floating state,
• when the internal circuit is subjected to an ESD stress, directing ESD current to a ground by the ESD protection apparatus through the at least one of the first doping region, the second doping region, the third doping region and the fourth doping region in the floating state, the first junction and the second junction.