Patent ID: 6037632
Filing Date: 2000-03-14
Classification: H01L

Abstract:
A semiconductor device comprising:a first main electrode;a second main electrode;a high-resistance semiconductor layer of a first conductivity type interposed between said first main electrode and said second main electrode; anda buried layer of a second conductivity type selectively formed in said high-resistance semiconductor layer of the first conductivity type, having a floated potential, and extending at substantially right angles to a line connecting said first and second main electrodes, and comprising a plurality of strips functioning as current paths and set at said floated potential different from a potential of any other electrode when a depletion layer extending from a region near said first main electrode reaches said buried layer of the second conductivity type,wherein the following relations hold:Vs=(BV-V.sub.1 -V.sub.2)/(M-1)V;V.sub.1 .gtoreq.Vs;V.sub.2 .gtoreq.Vs;N.sub.1 <1.897.times.10.sup.18 .times.V.sub.1.sup.-1.35 cm.sup.-3 ;N.sub.2 <1.897.times.10.sup.18 .times.V.sub.2.sup.-1.35 cm.sup.-3 ;Ns<1.897.times.10.sup.18 .times.Vs.sup.-1.35 cm.sup.-3 ;W.sub.1 <1.1247.times.10.sup.10 .times.N.sub.1.sup.-0.85 cm;Ws<1.1247.times.10.sup.10 .times.Ns.sup.-0.85 cm; andwhereBV is the breakdown voltage between said first and second main electrodes;M is the number of said buried layer of the second conductivity type between said first and second main electrodes;V.sub.1 is the voltage allotted to a first region of said high-resistance semiconductor layer of the first conductivity type between said first main electrode and said buried layer of the second conductivity type, said first region being located near said first main electrode;N.sub.1 is the impurities concentration of said first region of said high-resistance semiconductor layer of the first conductivity type;W.sub.1 is the thickness of said first region of said high-resistance semiconductor layer of the first conductivity type;V.sub.2 is the voltage allotted to a second region of said high-resistance semiconductor layer of the first conductivity type between said second main electrode and said buried layer of the second conductivity type, said second region being located near said second main electrode;N.sub.2 is the impurities concentration of said second region of said high-resistance semiconductor layer of the first conductivity type;Vs is the voltage allotted to a third region of said high-resistance semiconductor layer of the first conductivity type, said third region is between said first and second regions of said high-resistance semiconductor layer of the first conductivity type;Ns is the impurities concentration of said third region of said high-resistance semiconductor layer of the first conductivity type; andWs is the thickness of said third region of said high resistance semiconductor layer of the first conductivity type.