The invention relates to an integrated circuit, especially for igniting a restraint element of a car. Said circuit has a capacitor and an igniting element. A porous area (B1) of a semiconductor layer (1) forms a capacitor electrode which is separated from another semiconductor layer (3) by a dielectric layer (2), said other semiconductor layer being configured as another capacitor electrode. The other semiconductor layer (3) also has an area (J) which is tapered in its cross-section. This area serves as an igniting element (R) which is electrically connected to the capacitor (C).