Abstract:
A semiconductor device having electrodes formed along a peripheral part thereof in a staggered arrangement of lines including inside-line, central-line and outside-line electrodes. The inside-line electrodes are octagonal shaped with hypotenuses on the central-line electrode and the pellet sides thereof. The central-line electrodes are octagonal shaped with hypotenuses on the inside-line and outside-line electrode sides thereof. The maximum width of outside-line electrode wires between the hypotenuses of adjacent inside-line and central-line electrodes depends on the distance between centers of the inside-line and central-line electrodes, minimum lengths of the inside-line and central-line electrodes and electrode protective film, and the necessary minimum conductor interval between the central-line and inside-line electrodes. The position and form of the central-line and inside-line electrodes are determinable based on the given relationship and the necessary value of current.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This is a divisional application of application Ser. No. 09/956,123, filed Sep. 20, 2001 now U.S. Pat. No. 6,590,296, which is hereby incorporated by reference in its entirety for all purposes. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates to a semiconductor device and more particularly to a semiconductor device with staggered arrangement in three lines on the peripheral part of the surface of a semiconductor pellet. 
     DESCRIPTION OF THE RELATED ART 
     FIGS. 8 and 9 show the configuration of an electrode with staggered arrangement on the peripheral part of the surface of a semiconductor pellet in conventional art. FIG. 8 shows inside and outside electrodes  402  in two lines with staggered arrangement on the peripheral part of a semiconductor pellet  401 . As shown in FIG. 9, an inside-line electrode  403  has a square shape and an outside-line electrode  404  has a square shape or a rectangle shape in which the ratio of the sides is from 1 to 2. 
     However, the pad electrode arranged conventionally has following problems: 
     1. Since the wiring connected to the outside-line electrode is arranged to pass between the adjacent inside-line electrodes and the width of wiring has to be narrower than the interval between the inside-line electrodes, the pad electrode cannot be used for a terminal for a large amount of electric current and a grand terminal. 
     2. In the wire bonding, the wiring mistake is caused in a few cases by the wrong recognition of the adjacent pad electrode for the wire-bonding pad electrode. 
     3. The neighboring wires contact each other in a few cases in the wire bonding by arranging the outside-line electrode near the center of the inside pad electrode. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a novel and improved semiconductor device capable of widening the width of wiring for the outside electrode and embodying the wire bonding smoothly. 
     To solve the problem described above, the present representative invention provides: 
     A semiconductor device with staggered arrangement in three lines with an inside-line electrode, a central-line electrode and an outside-line electrode on the peripheral part of the surface of a semiconductor pellet, wherein the inside-line electrode configures a hexagonal electrode having a hypotenuse on the central-line electrode side formed to cut vertically on the position at a distance of the sum of the minimum length (R) of the electrode necessary for wire-bonding and the minimum length (F) of the electrode protective film from the center of the electrode on the line connecting the center of a rough square shaped electrode with each side consisted of the sum of the minimum length (R) of the electrode necessary for wire-bonding and the minimum length (F) of the electrode protective film and the center of the adjacent central-line electrode, the central-line electrode configures a hexagonal electrode having a hypotenuse on the inside-line electrode side formed to cut vertically on the position at a distance of the sum of the minimum length (R) of the electrode necessary for wire-bonding and the minimum length (F) of the electrode protective film from the center of the electrode on the line connecting the center of a rough square shaped electrode with each side consisted of the sum of the minimum length (R) of the electrode necessary for wire-bonding and the minimum length (F) of the electrode protective film and the center of the adjacent inside-line electrode; and 
     a semiconductor device wherein the maximum wiring width of the outside-line electrode wired intermediately parallel to the hypotenuse of the central-line electrode and the hypotenuse of the inside-line electrode is calculated with a following expression, considering the necessary minimum conductor interval (I) between the central-line electrode and the inside-line electrode; 
     
       
         the maximum wiring width=( A   2   +B   2 ) 1/2 −( R+F+I )×2  
       
     
     Since the present invention can achieve the width of wiring of the outside-line electrode connected to the internal circuit, which is wider than the conventional width of wiring, the outside-line electrode can be used as the one for a large amount of electric current, for example, an electric power supply. Further, since the electrode of the inside-line electrode and the electrode of the outside-line electrode are set apart each other, in recognizing the position of the electrode at the process of wire bonding, the adjacent electrode is not wrongly recognized. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and other features of the invention and the concomitant advantages will be better understood and appreciated by persons skilled in the field to which the invention pertains in view of the following description given in conjunction with the accompanying drawings which illustrate preferred embodiments. In the drawings: 
     FIG. 1 is a top plan view of a semiconductor device of first embodiment; 
     FIG. 2 is a partially enlarged view of an electrode arranged in the semiconductor device of the first embodiment; 
     FIG. 3 is a top plan view of a semiconductor device of second embodiment; 
     FIG. 4 is a partially enlarged view of an electrode arranged in the semiconductor device of the second embodiment; 
     FIG. 5 is a top plan view of a semiconductor device of third embodiment; 
     FIG. 6 is a partially enlarged view of an electrode arranged in the semiconductor device of the third embodiment; 
     FIG. 7 is a sectional view of an electrode arranged in the semiconductor device of the third embodiment; 
     FIG. 8 is a top plan view of a conventional semiconductor device; 
     FIG. 9 is a partially enlarged view of an electrode arranged in the conventional semiconductor device. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Same reference numerals are attached to components having the same functions in following description and the accompanying drawings and a description thereof is omitted. 
     (First Embodiment) 
     First, the first embodiment will be described in reference to FIGS. 1 and 2. It is to be noted that FIG. 1 is a top plan view of the semiconductor device of this embodiment. 
     First, as shown in FIG. 1, an outside-line electrode  103 , a central-line electrode  105  and an inside-line electrode  106  of a semiconductor pellet  101  have a staggered arrangement in three lines on the peripheral part  102  of a semiconductor pellet  101 . The outside-line electrode is formed in a square shape or a rectangle shape in which the ratio of the sides is from 1 to 2. The central-line electrode configures a hexagonal electrode having a hypotenuse formed to cut two corners at predetermined degrees on the inside-line electrode side of the rough square shaped electrode. The inside-line electrode configures a hexagonal electrode having a hypotenuse formed to cut the two corners at predetermined degrees on the central-line electrode side of the rough square shaped electrode. 
     In addition, between the central-line electrode and the inside-line electrode, wiring for connecting an internal circuit  110  of the semiconductor pellet  101  to the outside-line electrode is formed parallel to the hypotenuses of the central-line electrode and the inside-line electrode. 
     Next, the explanations of the electrodes and the wiring arranged in the semiconductor device of this embodiment will be provided in reference to FIG.  2 . It is to be noted that FIG. 2 is a partially enlarged view of the electrode arranged in the semiconductor device of the present invention. 
     First, as shown in FIG. 2, a basic pattern of an inside-line electrode  108  is a rough square shaped electrode and the each side is formed parallel or vertically to a pellet side  117 . The length of the each side of the basic rough square shaped electrode is expressed by the sum of the minimum radius (R)  111  of the electrode necessary for wire-bonding and the minimum width (F)  112  of the electrode protective film necessary for forming the electrode protective film from the center  115  of the electrode, that is, a distance  113 . 
     In this embodiment, the inside-line electrode  108  configures a hypotenuse formed to cut the rough square shaped electrode in a direction  119  which is perpendicular to a line segment G on the position (H)  118  at a distance of the sum of the minimum radius (R)  111  of the electrode necessary for wire-bonding and the minimum width (F)  112  of the electrode protective film necessary for forming the electrode protective film, on the line segment (G)  150  connecting the center  145  of the adjacent central-line electrode  107  and the center  115  of the inside-line electrode  108 . In this embodiment, two hypotenuses are formed to cut two corners on the central-line electrode side of the inside-line electrode  108 . 
     Since the inside-line electrode  108  has the hypotenuse on the position at a distance between the center of the basic rough square shaped electrode and each side of the electrode, the center  115  of the electrode becomes the center of the inscribing circle in contact with each side which is horizontal and vertical to the pellet side and with the hypotenuses. 
     In this embodiment, the inside-line electrode  108  configures a hexagonal electrode having two hypotenuses formed to cut the two corners facing the central-line electrode of the basic rough square shaped electrode at predetermined degrees and predetermined positions. Two sides  114  vertical to the pellet side  117  and two sides  116  horizontal to the pellet side  117  are the four sides of the basic rough square shaped electrode, and hypotenuses  120  formed to face the central-side electrode are the remaining two sides. 
     It is to be noted that a protective film to protect the electrode formed on the inside-line electrode  108  at the minimum width (F)  112  parallel to each side  114 ,  116  and  120  of the electrode. 
     On the other hand, the central-line electrode  107  configures a hexagonal electrode having a hypotenuse formed to cut two corners at predetermined degrees on the pellet side (the direction of the inside-line electrode) of the basic rough square shaped electrode. It is to be noted that the following description of the center of the electrode represents the point located at the same distance from each side of the basic rough square shaped electrode. 
     On the other hand, the basic pattern of the central-line electrode  107  is also a rough square shaped electrode, and the each side is formed parallel or vertically to the pellet side. The length of the each side of the rough square shaped electrode is expressed by the sum of the minimum radius (R)  141  of the electrode necessary for wire-bonding and the minimum width (F)  142  of the electrode protective film necessary for forming the electrode protective film from the center  145  of the electrode, that is, a distance  143 . 
     In this embodiment, the central-line electrode  107  has a hypotenuse formed to cut the rough square shaped electrode in a direction  149  which is perpendicular to a line segment G, on the position (H)  148  at a distance of the sum of the minimum radius (R)  141  of the electrode necessary for wire-bonding and the minimum radius (F)  142  of the electrode necessary for forming the electrode protective film, on the line segment (G)  150  connecting the center  115  of the adjacent inside-line electrode  108  and the center  145  of the central-line electrode  107 . In this embodiment, two hypotenuses are formed to cut two corners on the inside-line electrode side of the central-line electrode  107 . 
     Since the central-line electrode  107  has the hypotenuse on the position at a distance between the center of the basic rough square shaped electrode and each side of the electrode, the center  145  of the electrode becomes the center of the inscribing circle in contact with each side which is horizontal and vertical to the pellet side and the hypotenuses. 
     In this embodiment, the central-line electrode  107  configures a hexagonal electrode having a hypotenuse formed to cut the two corners facing the inside-line electrode of the basic rough square shaped electrode at predetermined degrees and predetermined positions. Two sides  144  vertical to the pellet side  117  and two sides  146  horizontal to the pellet side  117  are the four sides of the basic rough square shaped electrode, and hypotenuses  158  formed to face the inside-side electrode are the remaining two sides. 
     It is to be noted that a protective film to protect the electrode formed on the central-line electrode  107  at the minimum width (F)  142  parallel to each side  144 ,  146  and  158  of the electrode. 
     In this embodiment, the central-line electrode  107  and the inside-line electrode  108  are the hexagonal electrodes on which the hypotenuses facing each other are formed. 
     In addition, the wiring, which connects the internal circuit to the outside-line electrode, is formed between the central-line electrode and the inside-line electrode. In this embodiment, the wiring for the outside-line electrode is formed parallel to the hypotenuses between the inside-line electrode and the central-line electrode. 
     The maximum width  121  of the wiring for the outside-line electrode, which is formed intermediately parallel to the hypotenuses  120  and  158  of the central-line electrode  107  and the inside-line electrode  108 , is decided by the distance between the center of the adjacent central electrode  107  and the center of the inside-line electrode  108 , which is calculated from the distance of vertical direction (A)  122  between the centers of the electrodes and the distance of horizontal direction (B)  123  between the centers of the electrodes, the minimum length (R)  111  and  141  of the electrode necessary for wire-bonding, the minimum length (F)  112  and  142  of the electrode protective film, and the minimum length (I)  129  of the electric conductor, and is showed by a following expression 
     
       
         the maximum wiring width  121  between the hypotenuses=( A   2   +B   2 ) 1/2 −( R+F+I )×2  
       
     
     Also, assuming that the thicknesses of the wirings are roughly identical each other, the maximum current of the outside-line electrode  104  will be proportional to the width  121  of wiring of the hypotenuse. Consequently, the width between the hypotenuses is to be decided by the necessary value of the current. The interval  122  and  123  between the adjacent central-line electrode  107  and the inside-line electrode  108 , and the position and the form of the central-line electrode  107  and the inside-line electrode  108 , is to be decided by calculating backward from the above-mentioned expression. 
     Since this embodiment can achieve the width of wiring of the outside-line electrode connected to the internal circuit, which is wider than the conventional width of wiring, the outside-line electrode can be used as the one for a large amount of electric current, for example, an electric power supply. Further, since the electrode of the inside-line electrode and the electrode of the outside-line electrode are set apart each other, in recognizing the position of the electrode at the process of wire bonding, the adjacent electrode is not wrongly recognized. 
     (Second Embodiment) 
     In the embodiment described above, a hexagonal electrode having a hypotenuse formed to cut the two corners facing each other of a basic rough square shaped electrode is introduced as a central electrode and an inside-line electrode. In this embodiment, an octagonal electrode having a hypotenuse formed to cut all of the four corners of a basic rough square shaped electrode is introduced as a central electrode and an inside-line electrode. 
     Next, the second embodiment will be described in reference to FIGS. 3 and 4. It is to be noted that FIG. 3 is a top plan view of the semiconductor device of the present invention. 
     First, as shown in FIG. 3, an outside-line electrode  203 , a central-line electrode  205  and an inside-line electrode  206  of a semiconductor pellet  201  have a staggered arrangement in three lines on the peripheral part  202  of a semiconductor pellet  201 . The outside-line electrode is formed in a square shape or a rectangle shape in which the ratio of the sides is from 1 to 2. The central-line electrode configures an octagonal electrode having a hypotenuse formed to cut four corners of the rough square shaped electrode at predetermined degrees. The inside-line electrode configures an octagonal electrode having a hypotenuse formed to cut the four corners of the rough square shaped electrode at predetermined degrees. 
     In addition, between the central-line electrode and the inside-line electrode, wiring for connecting an internal circuit  210  of the semiconductor pellet  201  to the outside-line electrode is formed parallel to the hypotenuses of the central-line electrode and the inside-line electrode. 
     Next, the explanations of the electrodes and the wiring arranged in the semiconductor device of this embodiment will be provided in reference to FIG.  4 . It is to be noted that FIG. 4 is a partially enlarged view of the electrode arranged in the semiconductor device of the present invention. 
     First, as shown in FIG. 4, a basic pattern of an inside-line electrode  208  is a rough square shaped electrode and the each side is formed parallel or vertically to a pellet side  217 . The length of the each side of the basic rough square shaped electrode is expressed by the sum of the minimum radius (R)  211  of the electrode necessary for wire-bonding and the minimum width (F)  212  of the electrode protective film necessary for forming the electrode protective film from the center  215  of the electrode, that is, a distance  213 . 
     In this embodiment, the inside-line electrode  208  has two hypotenuses formed to cut the rough square shaped electrode in a direction  219  which is perpendicular to a line segment G on the position (H)  218  at a distance of the sum of the minimum radius (R)  211  of the electrode necessary for wire-bonding and the minimum width (F)  212  of the electrode protective film necessary for forming the electrode protective film, on the line segment (G)  250  connecting the center  245  of the adjacent central-line electrode  207  and the center  215  of the inside-line electrode  208 . In this embodiment, different from the one described above, a hypotenuse on the pellet side cutting two corners in the direction on a pellet  210  side of the inside-line electrode  208  is formed symmetrically and parallel to the hypotenuse on the central-line electrode side. 
     Since the inside-line electrode  208  has the hypotenuse on the position at a distance between the center of the basic rough square shaped electrode and each side of the electrode, the center  215  of the electrode becomes the center of the inscribing circle in contact with each side which is horizontal and vertical to the pellet side and with the hypotenuses. 
     In this embodiment, the inside-line electrode  208  configures a octagonal electrode having four hypotenuses formed to cut all the four corners of the basic rough square shaped electrode at predetermined degrees and predetermined positions. Two sides  214  vertical to the pellet side  217  and two sides  216  horizontal to the pellet side  217  are the four sides of the basic rough square shaped electrode, and hypotenuses  220  formed to cut all the four corners are the remaining four sides. 
     It is to be noted that a protective film to protect the electrode formed on the inside-line electrode  208  at the minimum width (F)  212  parallel to each side of the electrode. 
     On the other hand, a basic pattern of a central-line electrode  207  is a rough square shaped electrode, and the each side is formed parallel or vertically to a pellet side  217 . The length of the each side of the basic rough square shaped electrode is expressed by the sum of the minimum radius (R)  241  of the electrode necessary for wire-bonding and the minimum width (F)  242  of the electrode protective film necessary for forming the electrode protective film from the center  245  of the electrode, that is, a distance  243 . 
     In this embodiment, the central-line electrode  207  has two hypotenuses formed to cut the rough square shaped electrode in a direction  249  which is perpendicular to a line segment G, on the position (H)  248  at a distance of the sum of the minimum radius (R)  241  of the electrode necessary for wire-bonding and the minimum width (F)  242  of the electrode protective film necessary for forming the electrode protective film, on the line segment (G)  250  connecting the center  215  of the adjacent inside-line electrode  208  and the center  245  of the central-line electrode  207 . In this embodiment, different from the one described above, a hypotenuse on the outside-line electrode side cutting two corners in the direction opposite to the pellet  210  side of the inside-line electrode  208 , that is, the direction of the outside-line electrode  204 , is formed symmetrically and parallel to the hypotenuse on the inside-line electrode side. 
     Since the central-line electrode  207  has the hypotenuse on the position at a distance between the center of the basic rough square shaped electrode and each side of the electrode, the center  245  of the electrode becomes the center of the inscribing circle in contact with each side which is horizontal and vertical to the pellet side and the hypotenuses. 
     In this embodiment, the central-line electrode  207  configures a octagonal electrode having four hypotenuses formed to cut all the four corners of the basic rough square shaped electrode at predetermined degrees and predetermined positions. Two sides  244  vertical to the pellet side  217  and two sides  246  horizontal to the pellet side  217  are the four sides of the basic rough square shaped electrode, and hypotenuses  258  formed to cut all the four corners are the remaining four sides. 
     It is to be noted that a protective film to protect the electrode formed on the central-line electrode  207  at the minimum width (F)  242  parallel to each side of the electrode. 
     In this embodiment, the central-line electrode  207  and the inside-line electrode  208  are the hexagonal electrodes on which the hypotenuses facing each other are formed and on which the hypotenuses cutting the two corners in the opposite direction are formed at the same time. 
     In addition, the wiring, which connects the internal circuit to the outside-line electrode, is formed between the central-line electrode and the inside-line electrode. In this embodiment, the wiring for the outside-line electrode is formed parallel to the hypotenuses between the inside-line electrode and the central-line electrode. 
     The maximum width of wiring  221  for the outside-line electrode, which is formed intermediately parallel to the hypotenuses  220  and  258  of the inside-line electrode  208  and the central-line electrode  207 , is decided by the distance between the center of the adjacent central electrode  207  and the center of the inside-line electrode  208 , which is calculated from the distance of vertical direction (A)  222  between the centers of the electrodes and the distance of horizontal direction (B)  223  between the centers of the electrodes, the minimum length (R)  211  and  241  of the electrode necessary for wire-bonding, the minimum length (F)  212  and  242  of the electrode protective film, and the minimum length (I)  229  of the electric conductor, and is showed by a following expression; 
     
       
         The maximum wiring width  221  between the hypotenuses=( A   2   +B   2 ) 1/2 −( R+F+I )×2.  
       
     
     Also, assuming that the thicknesses of the wirings are roughly identical each other, the maximum current of the outside-line electrode  204  will be proportional to the width  221  of wiring of the hypotenuse. Consequently, the width between the hypotenuses is to be decided by the necessary value of the current. The interval  223  between the adjacent central-line electrode  207  and the inside-line electrode  208 , and the position and form of the central-line electrode  207  and the inside-line electrode  208 , is to be decided by calculating backward from the above-mentioned expression. 
     Since this embodiment can achieve the width of wiring of the outside-line electrode connected to the internal circuit, which is wider than the conventional width of wiring, the wiring of the outside-line electrode can be used as the one for a large amount of electric current, for example, an electric power supply. Further, since the electrode of the inside-line electrode and the electrode of the outside-line electrode are set apart each other, in recognizing the position of the electrode at the process of wire bonding, the adjacent electrode is not wrongly recognized. In addition, in this embodiment, since the inside-line electrode has a hypotenuse formed to cut two corners on the side of the pellet side, the freedom degree of wiring of the outside-line electrode can be enhanced. Consequently, the short defect at the process of wire bonding is to be decreased gradually. Further, since the central-line electrode has a hypotenuse formed to cut two corners on the side of the pellet side, the freedom degree of wiring can be further enhanced. 
     (Third Embodiment) 
     In the embodiment described above, the explanation is provided with regard to the configuration that a hexagonal or an octagonal electrode is introduced as a central electrode and an inside-line electrode. In this embodiment, an electrode with a two-layer structure configuring an octagonal lower electrode on the lower layer and a square upper electrode on the upper layer is introduced as a central electrode and an inside-line electrode. 
     Next, the third embodiment will be described in reference to the FIGS. 5,  6  and  7 . It is to be noted that FIG. 5 is a top plan view of the semiconductor device of the present invention. 
     First, as shown in FIG. 5, an outside-line electrode  303 , a central-line electrode  305  and an inside-line electrode  306  of a semiconductor pellet  301  have a staggered arrangement in three lines on the peripheral part  302  of a semiconductor pellet  301 . The outside-line electrode is formed in a square shape or a rectangle shape in which the ratio of the sides is from 1 to 2. In this embodiment, it is to be noted that the central-line electrode and the inside-line electrode configure a two-layer structure configuring an octagonal lower electrode on the lower layer and a square upper electrode on the upper layer. 
     In addition, between the lower electrode of the central-line electrode and the lower electrode of the inside-line electrode, wiring for connecting an internal circuit  310  of the semiconductor pellet  301  to the outside-line electrode is formed parallel to the hypotenuses of the central-line electrode and the inside-line electrode. 
     Next, the explanations of the electrodes and the wiring arranged in the semiconductor device of this embodiment will be provided in reference to FIG.  6 . It is to be noted that FIG. 6 is a partially enlarged view of the electrode arranged in the semiconductor device of the present invention. 
     In this embodiment, different from the one described above, the central-line electrode  307  has a two-layer structure consisting of the lower electrode configured of the octagonal electrode having a hypotenuse formed to cut all the four corners of the basic rough square shaped electrode at predetermined degrees and predetermined positions and the upper electrode configured of the rough square shaped electrode with a predetermined size. In addition, the inside-line electrode  308  has a two-layer structure consisting of the lower electrode configured of the octagonal electrode having a hypotenuse formed to cut all the four corners of the basic rough square shaped electrode at predetermined degrees and predetermined positions and the upper electrode configured of the rough square shaped electrode with a predetermined size. 
     As shown in FIG. 6, a basic pattern of the lower electrode  331  of the central-line electrode  307  is a rough square shaped electrode and the each side is formed parallel or vertically to a pellet side  317 . The length of the each side of the basic rough square shaped electrode is expressed by the minimum radius (R)  341  of the electrode necessary for wire bonding from the center  345  of the electrode. It is to be noted that the lower electrode  331  is covered with the insulating film so that the protective film is not formed thereon. 
     In this embodiment, the central-line electrode  307  has two hypotenuses formed to cut the rough square shaped electrode in a direction  349  which is perpendicular to a line segment G on the position (H)  348  at a distance of the minimum radius (R)  341  of the electrode necessary for wire-bonding, on the line segment (G)  350  connecting the center  315  of the lower electrode  351  of the adjacent inside-line electrode  308  and the center  345  of the lower electrode  331  of the central-line electrode  307 . 
     Since the lower electrode  331  of the central-line electrode  307  has the hypotenuse on the position at a distance between the center of the basic rough square shaped electrode and each side of the electrode, the center  345  of the electrode becomes the center of the inscribing circle in contact with each side which is horizontal and vertical to the pellet side and with the hypotenuses. 
     In this embodiment, the lower electrode  331  of the central-line electrode  307  configures a octagonal electrode having four hypotenuses formed to cut all the four corners of the basic rough square shaped electrode at predetermined degrees and predetermined positions. Two sides  344  vertical to the pellet side  317  and two sides  346  horizontal to the pellet side  317  are the four sides of the basic rough square shaped electrode, and hypotenuses  352  formed to cut all the four corners are the remaining four sides. 
     In addition, in this embodiment, the octagonal lower electrode  331  of the central-line electrode  307  is electrically connected to the square upper electrode  330  via a metal pillar  335  formed in a through hole  334  in the insulating layer  333 , as shown in FIG.  7 . Further, on the upper electrode  330 , the protective film  325  to protect the electrode is formed at the minimum width (F)  342  parallel to each side of the electrode. 
     On the other hand, a basic pattern of the lower electrode  351  of the inside-line electrode  308  is a rough square shaped electrode, and the each side is formed parallel or vertically to the pellet side  317 . The length of the each side of the basic rough square shaped electrode is expressed by the minimum radius (R)  311  of the electrode necessary for wire bonding from the center  315  of the electrode. It is to be noted that the lower electrode  351  is covered with the insulating film so that the protective film is not formed thereon. 
     In this embodiment, the inside-line electrode  308  has two hypotenuses formed to cut the rough square shaped electrode in a direction  319  which is perpendicular to a line segment G on the position (H)  318  at a distance of the minimum radius (R)  311  of the electrode necessary for wire-bonding, on the line segment (G)  350  connecting the center  345  of the lower electrode  331  of the adjacent central-line electrode  307  and the center  345  of the lower electrode  351  of the inside-line electrode  307 . 
     Since the lower electrode  351  of the inside-line electrode  308  has the hypotenuse on the position at a distance between the center of the basic rough square shaped electrode and each side of the electrode, the center  315  of the electrode becomes the center of the inscribing circle in contact with each side which is horizontal and vertical to the pellet side and with the hypotenuses. 
     In this embodiment, the lower electrode  351  of the inside-line electrode  308  configures a octagonal electrode having four hypotenuses formed to cut all the four corners of the basic rough square shaped electrode at predetermined degrees and predetermined positions. Two sides  314  vertical to the pellet side  317  and two sides  316  horizontal to the pellet side  317  are the four sides of the basic rough square shaped electrode, and hypotenuses  320  formed to cut all the four corners are the remaining four sides. 
     In addition, in this embodiment, the octagonal lower electrode  351  of the inside-line electrode  308  is electrically connected to the square upper electrode  352  via a metal pillar formed in a through hole in the insulating layer, similar to the case of the central-line electrode  307 . Further, on the upper electrode  352 , the protective film to protect the electrode is formed at the minimum width (F)  312  parallel to each side of the electrode. 
     In this embodiment, the lower electrode  331  of the central-line electrode  307  and the lower electrode  331  of the inside-line electrode  308  are the hexagonal electrodes on which the hypotenuses facing each other are formed and on which the hypotenuses cutting the two corners in the opposite direction are formed at the same time. Further, the upper electrode, which is electrically connected to the lower electrode via the insulating layer, has a rough square shape. 
     Between the lower electrode  331  of the central-line electrode  307  and the lower electrode  351  of the inside-line electrode  308 , which are configured as described above, a wiring  309  for connecting the internal circuit  310  of the semiconductor pellet  301  to the outside-line electrode  308  is formed parallel to the hypotenuses of the central-line electrode  307  and the inside-line electrode  308 . 
     The maximum width  321  of the wiring  309  for the outside-line electrode, which is formed intermediately parallel to the hypotenuses  320  and  358  of the lower electrode  335  of the central-line electrode  307  and the lower electrode  335  of the inside-line electrode  308 , is decided by the distance between the center of the lower electrode  331  of the central electrode  307  and the center of the lower electrode  351  of the inside-line electrode  308 , which is calculated from the distance of vertical direction (A)  322  between the centers of the electrodes and the distance of horizontal direction (B)  323  between the centers of the electrodes, the minimum length (R)  311  and  341  of the electrode necessary for wire-bonding and the minimum length (I)  329  of the electric conductor, and is showed by a following expression; 
     
       
         the maximum wiring width  321  between the hypotenuses=( A   2   +B   2 ) 1/2 −( R+I )×2  
       
     
     In this embodiment, since the octagonal lower electrode is covered with the insulating film and the protective film is not formed, the lower electrode can be formed smaller by the amount in which the protective film is not formed. Consequently, the width of wiring can be widened. 
     Also, assuming that the thicknesses of the wirings are roughly identical each other, the maximum current of the outside-line electrode  304  will be proportional to the width  321  of wiring of the hypotenuse. Consequently, the width between the hypotenuses is to be decided by the necessary value of the current. The interval  323  between the adjacent central-line electrode  307  and the inside-line electrode  308 , and the position and form of the central-line electrode  307  and the inside-line electrode  308 , is to be decided by calculating backward from the above-mentioned expression. 
     In this embodiment, since the protective film is not formed on the lower electrode, the width between the lower electrodes can be further widened by the amount in which the protective film is not formed. Consequently, the width of wiring of the outside-line electrode connected to the internal circuit can be widened. In addition, since the inside-line electrode has a hypotenuse formed to cut two corners on the side of the pellet side, the degree of freedom of wiring of the outside-line electrode can be enhanced. Further, since the central-line electrode has a hypotenuse formed to cut two corners on the side of the pellet side, the degree of freedom of wiring can be further enhanced. 
     Since the central-line electrode and the inside-line electrode are not arranged as linearly as they have been conventionally, the wrong recognition of the adjacent electrode and the short defect with the adjacent wire are to be decreased gradually at the process of wire-bonding. Further, since all the surfaces of the electrodes are formed in a square shape or a rectangle shape, the position of the electrode can be smoothly recognized in a short time at the process of wire bonding. 
     According to the third embodiment, since the insulating layer is formed on the parts of the lower electrodes of the central-line electrode and the inside-line electrode, the protective film need not be formed on the electrode. Consequently, the wiring is set between the lower electrodes of the central-line electrode and the inside-line electrode. The width of wiring of the outside-line electrode connected to the internal circuit can be further widened. Consequently, the electrode can be used as the one for a large amount of electric current, for example, an electric power supply. Further, since all the surfaces of the electrodes are formed in a square shape or a rectangle shape, the position of the electrode can be smoothly recognized in a short time at the process of wire bonding and the productivity of the semiconductor device is increased. 
     Although the semiconductor device according to the preferred embodiment of the present invention has been described, the present invention is not restricted to such examples. It is evident to those skilled in the art that the present invention may be modified or changed within a technical philosophy thereof and it is understood that naturally these belong to the technical philosophy of the present invention. 
     In the third embodiment, for example, the explanation is provided with regard to the configuration that the central-line electrode and the inside-line electrode have two-layer structures. However, if the uppermost layer of the electrode have a rough square shape, the embodiment can be achieved with a lower electrode having two layers or more. 
     In addition, in this embodiment, the explanation is provided with regard to the example that the outside-line electrode is located in the middle of the central-line electrode and the inside-line electrode which are adjacent each other and are arranged at regular intervals. However, the embodiment can be achieved even in the case that the central-line electrode and the inside-line electrode are not arranged at regular intervals. 
     Further, in the first and second embodiment, the explanation is provided with regard to the configuration that the outside-line electrode is formed in a square shape or a rectangle shape. However, the embodiment can be achieved even in the case that the outside-line electrode is shaped identically to that of the central-line electrode and the inside-line electrode. 
     Since the width of wiring of the outside-line electrode connected to the internal circuit, which is wider than the conventional width of wiring, the outside-line electrode can be used as the one for a large amount of electric current, for example, an electric power supply. 
     Further, since the electrode of the inside-line electrode and the electrode of the outside-line electrode are set apart each other, in recognizing the position of the electrode at the process of wire bonding, the adjacent electrode is not wrongly recognized.