Abstract: An object of the present invention is to improve the ESD resistance of an electrostatic protection element. The essence of the basic idea resides in that an electrostatic protection element ESD is configured to include not a thyristor or an npn bipolar transistor, but a pnp bipolar transistor so as to be connected in parallel with a diode. In other words, the essence of the basic idea resides in that an electrostatic protection element ESD is constituted by a diode parasitically provided with a pnp bipolar transistor.

Abstract: The disclosed lateral bipolar transistor is manufactured by a manufacturing process of self-alignedly implanting an impurity to a gate electrode and thermally diffusing the impurity to form a base layer and an emitter layer. The gate electrode is utilized as an independent fourth terminal in addition to base, emitter, and collector terminals, whereby hfe can be controlled and enhanced by a gate potential. Accordingly, the present invention can provide a bipolar transistor that is hardly affected by a manufacturing variation, or that can be corrected by the gate terminal, and that has a high gain.

Abstract: Disclosed is a semiconductor device that includes a first MOS transistor having a predetermined size and a second MOS transistor having a lager size than the first MOS transistor. The first MOS transistor is divided into two or more sections, each paired with a corresponding section of the second MOS transistor to form a unit cell. As the unit cell is cyclically formed on a substrate, the current mirror ratio between the total size of the first MOS transistor and the total size of the second MOS transistor remains unaffected by the nonuniformity of position-dependent temperature distribution.

Abstract: An impurity ion of a polarity opposite to that of an impurity ion forming an n-type diffusion layer is implanted into a lower portion of the n-type diffusion region in a region, in which n-channel type MISFET is to be formed, vertically with respect to a main surface of a semiconductor to form a first p-type pocket layer. Subsequently, an impurity of a p conduction type is implanted into a region between the n-type diffusion region and the first p-type pocket layer obliquely relative to the main surface of the semiconductor substrate to form a second p-type pocket layer. In this arrangement, the concentration of the impurity ion forming the second p-type pocket layer is made higher than the concentration of the impurity ion used to form the first p-type pocket layer.

Abstract: An impurity ion of a polarity opposite to that of an impurity ion forming an n-type diffusion layer is implanted into a lower portion of the n-type diffusion region in a region, in which n-channel type MISFET is to be formed, vertically with respect to a main surface of a semiconductor to form a first p-type pocket layer. Subsequently, an impurity of a p conduction type is implanted into a region between the n-type diffusion region and the first p-type pocket layer obliquely relative to the main surface of the semiconductor substrate to form a second p-type pocket layer. In this arrangement, the concentration of the impurity ion forming the second p-type pocket layer is made higher than the concentration of the impurity ion used to form the first p-type pocket layer.

Abstract: An impurity ion of a polarity opposite to that of an impurity ion forming an n-type diffusion layer is implanted into a lower portion of the n-type diffusion region in a region, in which n-channel type MISFET is to be formed, vertically with respect to a main surface of a semiconductor to form a first p-type pocket layer. Subsequently, an impurity of a p conduction type is implanted into a region between the n-type diffusion region and the first p-type pocket layer obliquely relative to the main surface of the semiconductor substrate to form a second p-type pocket layer. In this arrangement, the concentration of the impurity ion forming the second p-type pocket layer is made higher than the concentration of the impurity ion used to form the first p-type pocket layer.

Abstract: An impurity ion of a polarity opposite to that of an impurity ion forming an n-type diffusion layer is implanted into a lower portion of the n-type diffusion region in a region, in which n-channel type MISFET is to be formed, vertically with respect to a main surface of a semiconductor to form a first p-type pocket layer. Subsequently, an impurity of a p conduction type is implanted into a region between the n-type diffusion region and the first p-type pocket layer obliquely relative to the main surface of the semiconductor substrate to form a second p-type pocket layer. In this arrangement, the concentration of the impurity ion forming the second p-type pocket layer is made higher than the concentration of the impurity ion used to form the first p-type pocket layer.