Zde najdete seznam Top Taiwan Semiconductor Manufacturing Company (Seznam), které jsou seřazeny podle celkových tržeb (Tržby). TAIWAN SEMICONDUCTOR MANUFACTURING je největší společnost vyrábějící polovodiče na Tchaj-wanu s tržbami 57,264 XNUMX milionů $.
Seznam špičkových tchajwanských polovodičových výrobních společností
Zde je seznam nejlepších tchajwanských výrobců polovodičů, které jsou seřazeny na základě celkových tržeb (tržeb).
S.NO | Polovodičová společnost | Prodej | Poměr dluhu k vlastnímu kapitálu | Návratnost vlastního kapitálu | Provozní marže | EBITDA | Ticker |
1 | TAIWAN VÝROBA POLOVODIČŮ | $ 57,264 Million | 0.3 | 30% | 41% | $ 37,082 Million | 2330 |
2 | ASE TECHNOLOGY HOLDING CO LTD | $ 16,976 Million | 0.9 | 20% | 10% | $ 3,841 Million | 3711 |
3 | Společnost MEDIATEK INC | $ 11,465 Million | 0.1 | 26% | 20% | $ 3,729 Million | 2454 |
4 | UNITED MICRO ELECTRONICS | $ 6,293 Million | 0.3 | 21% | 17% | $ 2,930 Million | 2303 |
5 | SUPREME ELECTRONICS CO | $ 4,894 Million | 2.6 | 30% | 2% | $ 151 Million | 8112 |
6 | NOVATEK MICROELECTRONICS | $ 2,846 Million | 0.1 | 67% | 32% | $ 1,441 Million | 3034 |
7 | REALTEK SEMICONDUCTOR CORP | $ 2,767 Million | 0.4 | 48% | 15% | $ 628 Million | 2379 |
8 | Společnost POWERTECH TECHNOLOGY INC | $ 2,711 Million | 0.5 | 17% | 17% | $ 984 Million | 6239 |
9 | SINO-AMERICAN SILICON PRODUCTS INC | $ 2,185 Million | 1.0 | 25% | 25% | $ 821 Million | 5483 |
10 | NANYA TECHNOLOGY CORPORATION | $ 2,171 Million | 0.0 | 11% | 26% | $ 1,278 Million | 2408 |
11 | WINBOND ELECTRONIC CORP | $ 2,160 Million | 0.3 | 14% | 14% | $ 876 Million | 2344 |
12 | GLOBALWAFERS CO LTD | $ 1,970 Million | 1.1 | 29% | 27% | $ 791 Million | 6488 |
13 | ALLTEK TECHNOLOGY CORP | $ 1,493 Million | 1.4 | 22% | 2% | $ 38 Million | 3209 |
14 | MACRONIX INTERNATIONAL | $ 1,417 Million | 0.3 | 24% | 18% | $ 452 Million | 2337 |
15 | Společnost TOPCO SCIENTIFIC CO | $ 1,287 Million | 0.3 | 21% | 6% | $ 98 Million | 5434 |
16 | VANGUARD INTERNATIONAL SEMICONDUCTO | $ 1,179 Million | 0.1 | 33% | 29% | $ 559 Million | 5347 |
17 | Společnost CHIPMOS TECHNOLOGIES INC | $ 988 Million | 0.5 | 20% | 20% | $ 354 Million | 8150 |
18 | WIN SEMICONDUCTORS CORP | $ 909 Million | 0.9 | 15% | 24% | $ 367 Million | 3105 |
19 | Společnost EVERLIGHT ELECTRONICS CO | $ 770 Million | 0.2 | 11% | 10% | $ 144 Million | 2393 |
20 | NUVOTON TECHNOLOGY CORPORATION | $ 736 Million | 0.2 | 18% | 5% | $ 120 Million | 4919 |
21 | HANNSTAR DISPLAY CORP | $ 696 Million | 0.0 | 22% | 32% | $ 422 Million | 6116 |
22 | ZMĚNĚTE WAH ELECTROMATERIALS INC | $ 585 Million | 1.0 | 21% | 11% | $ 98 Million | 8070 |
23 | PARADE TECHNOLOGIES LTD | $ 544 Million | 0.0 | 33% | 28% | $ 212 Million | 4966 |
24 | ELITE SEMICONDUCTOR MICROELECTRONIC | $ 543 Million | 0.2 | 42% | 21% | $ 184 Million | 3006 |
25 | Společnost ELAN MICROELECTRONICS CORP | $ 537 Million | 0.1 | 57% | 31% | $ 220 Million | 2458 |
26 | SVATÝ KAMENNÝ PODNIK | $ 528 Million | 0.4 | 20% | 12% | $ 92 Million | 3026 |
27 | RAYDIUM SEMI-CONDUCTOR CORPORATION | $ 513 Million | 0.0 | 48% | 15% | $ 115 Million | 3592 |
28 | SILRGY CORP | $ 494 Million | 0.0 | 28% | 28% | $ 213 Million | 6415 |
29 | ORIENTOVÁ POLOVODIČOVÁ ELEKTRONIKA | $ 493 Million | 0.2 | 14% | 9% | $ 96 Million | 2329 |
30 | FOCALTECH SYSTEMS CO LTD | $ 491 Million | 0.1 | 55% | 29% | $ 219 Million | 3545 |
31 | GLOBAL UNICHIP CORP. | $ 483 Million | 0.1 | 36% | 13% | $ 88 Million | 3443 |
32 | UNITED RENEWABLE ENERGY CO LTD | $ 447 Million | 0.8 | -36% | -14% | - 22 milionů dolarů | 3576 |
33 | Společnost SIGURD MICROELECTRONICS CORP | $ 442 Million | 0.9 | 20% | 21% | $ 254 Million | 6257 |
34 | FORMOSA SUMCO TECHNOLOGY CORP | $ 425 Million | 0.0 | 7% | 16% | $ 142 Million | 3532 |
35 | TAIWAN SEMICONDUCTOR CO | $ 370 Million | 0.4 | 13% | 14% | $ 95 Million | 5425 |
36 | POKROČILÉ TECHNOLOGIE FORMOSA | $ 345 Million | 0.0 | 13% | 18% | $ 117 Million | 8131 |
37 | CHANG WAH TECHNOLOGY CO LTD | $ 344 Million | 0.7 | 22% | 15% | $ 84 Million | 6548 |
38 | TAIFLEX SCIENTIFIC CO | $ 312 Million | 0.3 | 11% | 12% | $ 54 Million | 8039 |
39 | SDI CORP | $ 301 Million | 0.5 | 14% | 11% | $ 66 Million | 2351 |
40 | PIXART IMAGING | $ 290 Million | 0.1 | 21% | 24% | $ 92 Million | 3227 |
41 | WAFER WORKS CORPORATION | $ 264 Million | 0.6 | 8% | 16% | $ 102 Million | 6182 |
42 | GLOBAL MIXED-MODE TECHNOLOGY INC | $ 264 Million | 0.1 | 38% | 27% | $ 92 Million | 8081 |
43 | Společnost XINTEC INC | $ 259 Million | 0.0 | 45% | 29% | $ 117 Million | 3374 |
44 | ALCHIP TECHNOLOGIES LIMITD | $ 252 Million | 0.0 | 20% | 17% | $ 109 Million | 3661 |
45 | ASMEDIA TECHNOLOGY INC | $ 248 Million | 0.0 | 24% | 33% | $ 89 Million | 5269 |
46 | PŘES TECHNOLOGIE | $ 231 Million | 0.3 | 89% | -24% | - 48 milionů dolarů | 2388 |
47 | LIFESTYLE GLOBAL ENTERPRISE INC | $ 228 Million | 0.9 | 8% | 3% | $ 8 Million | 8066 |
48 | HERAN CO LTD | $ 215 Million | 0.0 | 20% | 15% | $ 35 Million | 5283 |
49 | WALTON ADVANCED ENGINEERING INC | $ 212 Million | 0.7 | 1% | -1% | $ 59 Million | 8110 |
50 | Společnost OPTOTECH CORP | $ 199 Million | 0.1 | 11% | 17% | $ 56 Million | 2340 |
51 | HOLTEK SEMICONDUCTOR INC | $ 199 Million | 0.1 | 43% | 25% | $ 67 Million | 6202 |
52 | FARADAY TECHNOLOGY | $ 196 Million | 0.0 | 11% | 12% | $ 45 Million | 3035 |
53 | POKROČILÁ OPTOELEKTRONICKÁ TECHNOLOGIE | $ 195 Million | 0.1 | 2% | 1% | $ 10 Million | 3437 |
54 | Společnost CASWELL INC | $ 195 Million | 0.1 | 8% | 7% | $ 15 Million | 6416 |
55 | ANPEC ELECTRONICS CORP | $ 192 Million | 0.0 | 33% | 18% | $ 47 Million | 6138 |
56 | SONIX TECHNOLOGY CO | $ 191 Million | 0.0 | 38% | 30% | $ 70 Million | 5471 |
57 | RICHWAVE TECHNOLOGY CORPORATION | $ 190 Million | 0.0 | 40% | 16% | $ 40 Million | 4968 |
58 | SENSORTEK TECHNOLOGY CORP | $ 188 Million | 0.0 | 37% | 31% | $ 73 Million | 6732 |
59 | SHUNSIN TECHNOLOGY HOLDINGS LTD | $ 173 Million | 0.9 | 12% | 10% | $ 36 Million | 6451 |
60 | Společnost ITE TECH INC. | $ 171 Million | 0.0 | 33% | 28% | $ 72 Million | 3014 |
61 | TSEC CORPORATION | $ 165 Million | 0.8 | -6% | -5% | $ 9 Million | 6443 |
62 | CHUNGHWA PRECISION TEST TECH CO LTD | $ 150 Million | 0.0 | 12% | 26% | $ 51 Million | 6510 |
63 | UPI | $ 149 Million | 0.2 | 41% | 17% | $ 35 Million | 6719 |
64 | C SUN MANUFACTURING CO | $ 145 Million | 0.6 | 26% | 13% | $ 29 Million | 2467 |
65 | EPISIL PRECISION INCORPORATION | $ 144 Million | 0.2 | 7% | 7% | $ 29 Million | 3016 |
66 | SUBTRON | $ 138 Million | 0.6 | 11% | 11% | $ 30 Million | 8179 |
67 | CONTREL TECHNOLOGY CO LTD | $ 135 Million | 0.4 | 12% | 15% | $ 29 Million | 8064 |
68 | GEM SERVICES INC | $ 133 Million | 0.0 | 22% | 24% | $ 52 Million | 6525 |
69 | SCIENTECH CORPORATION | $ 127 Million | 0.1 | 14% | 13% | $ 24 Million | 3583 |
70 | AP MEMORY TECHNOLOGY CORPORATION | $ 126 Million | 0.0 | 61% | 34% | $ 74 Million | 6531 |
71 | ADVANCED WIRELESS SEMICONDUCTOR CO | $ 126 Million | 0.0 | 10% | 20% | $ 45 Million | 8086 |
72 | YOUNGTEK ELECTRONICS CORPORATION | $ 125 Million | 0.1 | 16% | 24% | $ 61 Million | 6261 |
73 | CREATIVE SENZOR INC | $ 121 Million | 0.5 | 6% | 6% | $ 12 Million | 8249 |
74 | Společnost SILICON OPTRONICS INC | $ 118 Million | 0.1 | 32% | 20% | $ 36 Million | 3530 |
75 | ADVANCED POWER ELECTRONICS | $ 111 Million | 0.3 | 30% | 16% | $ 24 Million | 8261 |
76 | Společnost ASPEED TECHNOLOGY INC | $ 109 Million | 0.1 | 38% | 44% | $ 60 Million | 5274 |
77 | SHIN RUENN DEVELOPMENT CO LTD | $ 102 Million | 3.5 | 24% | 15% | $ 29 Million | 6186 |
78 | WHOLETECH SYSTEM HITECH LIMITED | $ 101 Million | 0.0 | 20% | 12% | $ 15 Million | 3402 |
79 | WELLTEND TECHNOLOGY CORPORATION | $ 97 Million | 0.6 | 11% | 7% | $ 11 Million | 3021 |
80 | YEH-CHIANG TECHNOLOGY CO | $ 95 Million | 0.2 | 7% | 13% | $ 21 Million | 6124 |
81 | JMC ELECTRONICS CO LTD | $ 94 Million | 0.6 | 13% | 11% | $ 25 Million | 6552 |
82 | WELTREND SEMI-CONDUCTOR INC | $ 93 Million | 0.2 | 23% | 9% | $ 15 Million | 2436 |
83 | HENGS | $ 92 Million | 0.8 | 66% | 14% | $ 17 Million | 4582 |
84 | HARVÁTEK CORP | $ 89 Million | 0.1 | 12% | 15% | $ 20 Million | 6168 |
85 | NIKO SEMICONDUCTOR CO | $ 88 Million | 0.0 | 15% | 14% | $ 15 Million | 3317 |
86 | PHOENIX SILICON INTERNATIONAL CORP | $ 87 Million | 1.1 | 7% | 6% | $ 25 Million | 8028 |
87 | LAND MARK OPTOELECTRONICS CORP | $ 82 Million | 0.1 | 13% | 31% | $ 42 Million | 3081 |
88 | ANJI TECHNOLOGY CO LTD | $ 74 Million | 1.2 | 5% | 17% | $ 10 Million | 6477 |
89 | UNITED RECOMMEND INTERNATIONAL CO | $ 74 Million | 2.4 | 14% | 6% | $ 8 Million | 5321 |
90 | ALI CORPORATION | $ 74 Million | 0.0 | -5% | -9% | - 3 milionů dolarů | 3041 |
91 | MOSA INDUSTRIAL CORPORATION | $ 73 Million | 0.7 | 8% | 20% | $ 30 Million | 4564 |
92 | VIA LABS INC | $ 70 Million | 0.0 | 37% | 29% | $ 33 Million | 6756 |
93 | EXCELLIANCE MOS CORP | $ 70 Million | 0.0 | 44% | 28% | $ 27 Million | 5299 |
94 | Společnost ZILLTEK TECHNOLOGY CORP | $ 68 Million | 0.0 | 42% | 27% | $ 26 Million | 6679 |
95 | Společnost MOSEL VITELIC INC | $ 66 Million | 0.1 | 15% | 11% | $ 9 Million | 2342 |
96 | EMEMORY TECHNOLOGY INC. | $ 63 Million | 0.0 | 51% | 53% | $ 44 Million | 3529 |
97 | PROMATE SOLUTIONS CORPORATION | $ 63 Million | 0.0 | 15% | 14% | $ 9 Million | 6577 |
98 | POLYTRONICS TECHNOLOGY CORP | $ 63 Million | 0.4 | 23% | 21% | $ 26 Million | 6224 |
99 | V-TAC TECHNOLOGY CO LTD | $ 62 Million | 0.4 | 23% | 6% | $ 5 Million | 6229 |
100 | ALL RING TECH CO | $ 54 Million | 0.0 | 26% | 24% | $ 24 Million | 6187 |
101 | Společnost GCS HOLDINGS INC | $ 53 Million | 0.1 | -9% | -1% | $ 4 Million | 4991 |
102 | LEADTREND TECHNOLOGY CORPORATION | $ 51 Million | 0.0 | 17% | 15% | $ 13 Million | 3588 |
103 | Společnost WISECHIP SEMICONDUCTOR INC | $ 48 Million | 0.2 | 15% | 14% | $ 11 Million | 5245 |
104 | ULTRA CHIP INC | $ 48 Million | 0.1 | 32% | 25% | $ 24 Million | 3141 |
105 | EPILEDS TECHNOLOGIES INC | $ 46 Million | 0.5 | 8% | 9% | $ 11 Million | 4956 |
106 | ADVANCED ANALOG TECHNOLOGY INC | $ 46 Million | 0.1 | 17% | 19% | $ 13 Million | 3438 |
107 | GONGIN PRECISION INDUSTRIAL CO | $ 45 Million | 1.1 | 9% | 9% | $ 11 Million | 3178 |
108 | YEU HWAN TECHNOLOGY CORP | $ 45 Million | 0.2 | 13% | 1% | $ 5 Million | 3276 |
109 | COSMO ELECTRONICS | $ 44 Million | 1.2 | 0% | -1% | $ 3 Million | 2466 |
110 | POKROČILÉ MIKROELEKTRONICKÉ PRODUKTY | $ 44 Million | 7.5 | 35% | 4% | $ 5 Million | 6287 |
111 | EGALAX EMPIA TECHNOLOGY INC. | $ 44 Million | 0.0 | 30% | 26% | $ 16 Million | 3556 |
112 | LASER TEK TAIWAN CO | $ 43 Million | 1.5 | 14% | 12% | $ 9 Million | 6207 |
113 | P-DUKE TECHNOLOGY CO LTD | $ 43 Million | 0.7 | 23% | 36% | $ 20 Million | 8109 |
114 | Společnost CYSTECH ELECTRONICS CORP | $ 42 Million | 0.1 | 33% | 20% | $ 11 Million | 6651 |
115 | LUXNET CORPORATION | $ 42 Million | 0.4 | -20% | -27% | - 3 milionů dolarů | 4979 |
116 | HYCON TECHNOLOGY CORPORATION | $ 41 Million | 0.0 | 53% | 31% | $ 16 Million | 6457 |
117 | Společnost ALCOR MICRO CORP | $ 41 Million | 0.0 | 12% | 9% | $ 8 Million | 8054 |
118 | FAVITE INC. | $ 41 Million | 0.7 | -4% | 2% | $ 1 Million | 3535 |
119 | GST | $ 40 Million | 0.7 | 5% | 3% | $ 1 Million | 5262 |
120 | PRINCETON TECHNOLOGY CORP | $ 39 Million | 0.1 | 5% | 6% | $ 5 Million | 6129 |
121 | CHAMPION MICROELECTRONIC CORP | $ 38 Million | 0.0 | 26% | 35% | $ 18 Million | 3257 |
122 | M31 TECHNOLOGY CORPORATION | $ 35 Million | 0.1 | 17% | 34% | $ 13 Million | 6643 |
123 | NICHING INDUSTRIAL CORP | $ 34 Million | 0.3 | 16% | 12% | $ 6 Million | 3444 |
124 | Společnost HAUMAN TECHNOLOGIES CORP | $ 30 Million | 0.0 | 6% | 6% | $ 3 Million | 6218 |
125 | Společnost IC PLUS CORP. | $ 30 Million | 0.1 | 0% | 3% | $ 2 Million | 8040 |
126 | C-MEDIA ELECTRONICS | $ 29 Million | 0.0 | 32% | 33% | $ 19 Million | 6237 |
127 | FALCON POWER CO. LTD. | $ 29 Million | 0.0 | 9% | 3% | $ 1 Million | 1516 |
128 | PARA LIGHT ELECTRONICS CO | $ 29 Million | 0.6 | 1% | 3% | $ 3 Million | 6226 |
129 | KINTECH ELECTRONICS CO | $ 27 Million | 0.1 | 13% | 18% | $ 6 Million | 6210 |
130 | Společnost TRANSCOM INC | $ 25 Million | 0.1 | 5222 | |||
131 | PADAUK TECHNOLOGY CO LTD | $ 24 Million | 0.1 | 40% | 33% | $ 12 Million | 6716 |
132 | ELEKTRONIKA NEW ERA | $ 24 Million | 0.1 | -4% | -10% | - 1 milionů dolarů | 4909 |
133 | FORCE MOS | $ 24 Million | 0.1 | 19% | 11% | $ 4 Million | 4923 |
134 | JMICRON | $ 24 Million | 0.1 | 6% | -2% | $ 3 Million | 4925 |
135 | PROLIGHT | $ 24 Million | 0.1 | 0% | 1% | $ 3 Million | 5277 |
136 | INTELLIEPI INC (CAYMAN) | $ 24 Million | 0.0 | 8% | 13% | $ 6 Million | 4971 |
137 | SOLID STATE SYSTEM CO | $ 23 Million | 0.3 | -9% | -5% | $ 1 Million | 3259 |
138 | TEKCORE CO | $ 23 Million | 0.7 | 9% | 2% | $ 3 Million | 3339 |
139 | TECHNOLOGIE ENE | $ 23 Million | 0.6 | 3% | 6% | $ 2 Million | 6243 |
140 | FINEMAT APPLIED MATERIÁLY CO LTD | $ 22 Million | 0.3 | 3% | 11% | $ 6 Million | 6698 |
141 | GENESIS PHOTONICS INC. | $ 20 Million | 37.8 | -111% | -35% | $ 0 Million | 3383 |
142 | CALITECH CO LTD | $ 19 Million | 0.0 | 9% | 21% | $ 4 Million | 6532 |
143 | MAX ECHO | $ 18 Million | 1.2 | 9% | 9% | $ 3 Million | 5228 |
144 | MEGAWIN TECHNOLOGY CO LTD | $ 18 Million | 0.4 | 19% | 11% | $ 3 Million | 3122 |
145 | DESIGNOVÁ TECHNOLOGIE TONTEK | $ 17 Million | 0.0 | 8% | 16% | $ 3 Million | 5487 |
146 | AMICCOM ELECTRONICS CORPORATION | $ 16 Million | 0.1 | 3% | 4% | $ 3 Million | 5272 |
147 | ONANO INDUSTRIAL CORP | $ 16 Million | 0.0 | 2% | 0% | $ 3 Million | 6405 |
148 | ALPHA MICRO ELECTRONICS CORP | $ 16 Million | 0.0 | 8% | 12% | $ 3 Million | 8024 |
149 | FUZETEC TECHNOLOGY CO LTD | $ 16 Million | 0.3 | 18% | 30% | $ 7 Million | 6642 |
150 | BARVENÍ A DOKONČENÍ NAN-YANG | $ 15 Million | 0.0 | 7% | 23% | $ 5 Million | 1410 |
151 | SENTELIC CORP | $ 14 Million | 0.0 | 16% | 22% | $ 4 Million | 4945 |
152 | RDC SEMICONDUCTOR CO | $ 13 Million | 0.1 | 46% | 41% | $ 12 Million | 3228 |
153 | PGC | $ 13 Million | 0.0 | -1% | -1% | $ 0 Million | 8227 |
154 | VATE TECHNOLOGY CO | $ 13 Million | 0.1 | 13% | 16% | $ 5 Million | 5344 |
155 | AMIDA | $ 12 Million | 0.2 | 27% | 44% | $ 7 Million | 6735 |
156 | SYNCOMM | $ 11 Million | 0.0 | 26% | 19% | $ 3 Million | 3150 |
157 | MP | $ 10 Million | 0.2 | 15% | 10% | $ 2 Million | 6720 |
158 | EFUN TECHNOLOGIES CO LTD | $ 9 Million | 1.6 | -27% | -47% | - 2 milionů dolarů | 3523 |
159 | 3S | $ 9 Million | 0.4 | -2% | 1% | $ 0 Million | 5297 |
160 | MARS | $ 8 Million | 0.3 | 22% | 22% | $ 3 Million | 6708 |
161 | DAVICOM SEMICONDUCTOR INC. | $ 8 Million | 0.1 | 6% | 18% | $ 2 Million | 3094 |
162 | UC GN | $ 8 Million | 0.3 | 7% | 1% | $ 0 Million | 3603 |
163 | BULL WILL CO | $ 7 Million | 0.2 | 4% | -2% | $ 0 Million | 6259 |
164 | HSINJING HOLDING CO LTD | $ 6 Million | 0.9 | 8% | 10% | $ 3 Million | 3713 |
165 | SILICON INTEGRATED SYSTEMS CORP | $ 6 Million | 0.0 | 1% | -161% | - 12 milionů dolarů | 2363 |
166 | NAPÁJENÍ SYNCHRONIZACE | $ 6 Million | 0.1 | 0% | -1% | $ 0 Million | 6545 |
167 | TM TECHNOLOGY INC | $ 5 Million | 0.4 | -5% | 9% | $ 1 Million | 5468 |
168 | MOSPEC SEMICONDUCTOR CORP | $ 5 Million | 0.1 | 7% | -22% | $ 0 Million | 2434 |
169 | SILICON TOUCH TECHNOLOGY INC | $ 4 Million | 0.7 | -3% | -5% | $ 0 Million | 3288 |
170 | HPL | $ 3 Million | 0.1 | -8% | -15% | $ 0 Million | 6559 |
171 | FEEI CHERNG ENTERPRISE CO | $ 3 Million | 0.0 | -7% | -25% | $ 0 Million | 3313 |
172 | TEAMPHON ENERGY CO LTD. | $ 2 Million | 1.9 | -27% | -42% | $ 0 Million | 3073 |
173 | SKUTEČNĚ BIOMEDICAL INC | $ 2 Million | 0.0 | -8% | -25% | $ 0 Million | 6236 |
174 | AVERLOGICKÁ TECHNOLOGIE | $ 1 Million | 0.0 | 2% | 19% | $ 0 Million | 6198 |
Takže konečně toto je seznam nejlepších tchajwanských výrobců polovodičů