US Patent 10431577 Methods of forming circuit-protection devices

Methods of forming a circuit-protection device include forming a dielectric having a first thickness and a second thickness greater than the first thickness over a semiconductor, forming a conductor over the dielectric, and patterning the conductor to retain a portion of the conductor over a portion of the dielectric having the second thickness, and to retain substantially no portion of the conductor over a portion of the dielectric having the first thickness, wherein the retained portion of the conductor defines a control gate of a field-effect transistor of the circuit-protection device.