Power transistor having multifinger contacts

A power transistor comprising:

• a plurality of monolithically integrated, contacted individual transistors arranged in a single plane on a first surface of a semiconductor member, each of said transistors having finger shaped contacts;
• at least one common strip-shaped contact along which said individual transistors are arranged, respective finger shaped contacts thereby defining a position of a respective individual transistor on said strip-shaped contact, spacings being provided between said individual transistors;
• at least some of said spacings being different in terms of size such that, during operation of the power transistor in a predetermined range of electrical nominal power, temperature distribution of the power transistor is substantially uniform;
• and
• a second surface of the semiconductor member lying opposite the first surface having the individual transistors connected to a heat sink and remaining surfaces of the semiconductor member being at least approximately thermally insulated, wherein the finger-shaped contacts are arranged such that a temperature distribution of the power transistor is substantially uniform, said temperature distribution of the power transistor is substantially uniform, said temperature distribution being determined by a numerical solution of a static thermal conduction equation, .DELTA.T (x, y, z) = 0, by means of fast Fourier analysis, where an equation - K (T) .gradient.T (x, y, 0) = Q (x, y, 0) having a material-dependent and temperature-dependent thermal conduction coefficient K and at least one locus-dependent heat source Q functions as boundary condition in the region of the contacts.

A power transistor comprising:

• a plurality of monolithically integrated, contacted individual transistors arranged in a single plane, the transistors having finger-shaped contacts;
• the finger-shaped contacts arranged laterally along a stripshaped contact surface to which a power supply is connected at both ends thereof;
• spacings of contacts following one another in a longitudinal direction of the contact surface varying relative to one another and mirror-symmetrical relative to a straight line proceeding perpendicularly to the longitudinal direction of the strip-shaped contact surface through a middle thereof;
• and
• the spacings of the finger-shaped contacts following one another in the longitudinal direction in a respective row being approximately identical with the exception of spacings present in a middle and at the ends, two middle contacts adjacent one another having a smaller spacing compared to spacing of contacts following in both directions, and respective contacts situated at the ends having a smaller spacing compared to respectively following contacts.