Standard cell, standard cell library, and semiconductor integrated circuit with suppressed variation in characteristics

A standard cell having a rectangular shape defined by a first direction and a second direction that is perpendicular to the first direction, the standard cell comprising:

• a plurality of transistors each having a diffusion region and a gate,
• a power supply wiring extended in the first direction,
• wherein the plurality of transistors include:
• at least one first transistor having larger gate length than the other transistors;
• and
• at least one second transistor adjacent to the first transistor and having a diffusion region apart from a diffusion region of the first transistor, and
• wherein the gate length of the at least one first transistor is defined by a length of gate in the first direction, and
• wherein a dummy gate is provided between the first transistor and the second transistor,
• a source/drain of the first transistor and a source/drain of the second transistor are separated;
• a width of the dummy gate in the first direction is smaller than a distance between the source/drain of the first transistor and the source/drain of the second transistor;
• and
• the dummy gate is provided in a region between the first and second transistors when viewed in plan view.