热搜：逻辑器件二极管电容/电阻

English 简体中文

当前位置：首页 > 商品目录 > 连接器、互连件 > IC、晶体管插座 > IC 插座

制造商	系列	包装	产品状态	类型	位置或引脚数量（网格）	配对间距	触点表面处理 - 配对	触点表面处理厚度 - 配对部分	触点材料 - 配对部分	安装类型	特性	端接方式	引脚间距	触点表面处理 - 引脚	触点表面处理厚度 - 引脚	触点材料 - 引脚	外壳材料	工作温度
3M ACES GROUP Adafruit Industries LLC Adam Tech Amphenol Anytek Amphenol ICC (FCI) Aries Electronics ASSMANN WSW Components BOYD Chip Quik Inc. CnC Tech EDAC Inc. Grayhill Inc. Harwin Inc. Ironwood Electronics Keystone Electronics Kycon, Inc. LOTES Marutsuelec MikroElektronika Mill-Max Manufacturing Corp. MiS Technologies Molex Omron Electronics Inc-EMC Div On Shore Technology Inc. Preci-Dip Samtec Inc. SparkFun Electronics Sullins Connector Solutions TE Connectivity TE Connectivity ALCOSWITCH Switches TE Connectivity AMP Connectors TE Connectivity Potter & Brumfield Relays Texas Instruments Yamaichi Electronics	* - 0503 0513 0517 100 101 104 105028 105142 105163 105167 105190 105199 105200 110 111 114 115 116 117 121 122 123 124 126 127 146 210 214 217 22 223 299 300 310 311 315 316 317 321 322 323 324 326 346 400 4038 410 411 415 416 47337 47594 47989 4800 500 501 503 508 50950 50951 50960 510 511 513 514 515 516 517 518 522 523 536 537 540 546 547 55 550 551 558 57 600 605 612 614 6556 6621 69802 700 700 Elevator Strip-Line™ 712 714 78499 78725 8 800 8058 8059 8060 8080 8180 8400 917 91960 940 A APA APO AR BU BU-178HT Correct-A-Chip® 1109800 D0 D00 D01-950 D01-993 D01-995 D01-997 D2 D26 D39 D73064 D830 D8864 D95 DILB Diplomate DL DMD DPF3 ED Edge-Grip™, C81 Edge-Grip™, C91 EJECT-A-DIP™ FCM Grypper HIC HLS IC ICA ICF ICM ICO ICS LGH Lo-PRO®file, 513 Lo-PRO®file, 526 Lo-PRO®file, C93 MHA MVAS OEM PCS PGG PGM PKA PLCC PLS PRS PX SA SBU SIP050-1x SIP1x SMPX SPF080-1x STA SU Textool™ Vertisockets™ 800 WMS XR2	- Bag Box Bulk Cut Tape (CT) Tape & Reel (TR) Tray Tube	Active Discontinued at BomKey Last Time Buy Obsolete	- Axial BGA Camera Socket CLCC DIP, 0.1" (2.54mm) Row Spacing DIP, 0.2" (5.08mm) Row Spacing DIP, 0.3" (7.62mm) Row Spacing DIP, 0.4" (10.16mm) Row Spacing DIP, 0.5 to 0.6" Row Spacing DIP, 0.6" (15.24mm) Row Spacing DIP, 0.75" (19.05mm) Row Spacing DIP, 0.9" (22.86mm) Row Spacing DIP, Staggered DIP, ZIF (ZIP) DIP, ZIF (ZIP), 0.3" (7.62mm) Row Spacing DIP, ZIF (ZIP), 0.4" (10.16mm) Row Spacing DIP, ZIF (ZIP), 0.6" (15.24mm) Row Spacing DIP, ZIF (ZIP), 0.9" (22.86mm) Row Spacing DIP, ZIF (ZIP), 1.0" (25.40mm) Row Spacing Housing LGA LGA 4189 PGA PGA, ZIF (ZIP) PLCC PLCC, ZIF (ZIP) QFN QFP SIP SIP, ZIF (ZIP) SOIC SOIC, ZIF (ZIP) Transistor Transistor, TO-100 Transistor, TO-220 Transistor, TO-220 and TO-247 Transistor, TO-254 Transistor, TO-262 Transistor, TO-3 Transistor, TO-3 and TO-66 Transistor, TO-5 Zig-Zag Zig-Zag, Left Stackable Zig-Zag, Right Stackable Zig-Zag, ZIF (ZIP)	- 1 (1 x 1) 10 10 (1 x 10) 10 (2 x 5) 10 (2 x 5), 6 Loaded 10 (2 x 5), 8 Loaded 10 (Round) 100 (10 x 10) 100 (11 x 11) 100 (13 x 13) 100 (15 x 15) 100 (4 x 25) 100 (5 x 20) 101 (11 x 11) 101 (13 x 13) 101 (15 x 15) 104 (8 x 13) 107 (12 x 12) 108 (12 x 12) 108 (13 x 13) 109 (12 x 12) 11 (1 x 11) 114 (13 x 13) 115 1150 1151 1155 (40 x 40) 1156 (34 x 34) 12 12 (1 x 12) 12 (2 x 6) 12 (2 x 6), 6 Loaded 12 (3 x 4) 12 (4 x 3) 12 (5 x 5) 120 (10 x 12) 120 (13 x 13) 120 (6 x 20) 1207 (33 x 34) 121 (11 x 11) 121 (13 x 13) 121 (15 x 15) 124 (13 x 13) 125 (13 x 13) 127 (16 x 16) 128 (13 x 13) 13 (1 x 13) 132 132 (13 x 13) 132 (14 x 14) 132 (4 x 33) 133 (13 x 13) 133 (14 x 14) 135 (14 x 14) 1356 (32 x 41) 136 (14 x 14) 136 (8 x 17) 1366 (32 x 41) 14 14 (1 x 14) 14 (2 x 7) 14 (2 x 7), 4 Loaded 14 (2 x 7), 8 Loaded 140 (20 x 7) 141 (21 x 21) 142 (15 x 15) 143 (15 x 15) 144 144 (12 x 12) 144 (13 x 13) 144 (15 x 15) 144 (4 x 36) 145 145 (13 x 13) 145 (15 x 15) 145 (17 x 17) 146 (15 x 15) 148 (15 x 15) 149 (15 x 15) 15 (1 x 15) 15 (3 x 5) 15 (5 x 3) 150 (10 x 15) 152 153 (12 x 13) 153 (15 x 15) 155 (16 x 16) 156 (15 x 15) 156 (16 x 16) 1567 159 (16 x 16) 16 16 (1 x 16) 16 (2 x 8) 16 (2 x 8), 4 Loaded 16 (2 x 8), 8 Loaded 16 (3x3) 16 (4 x 4) 160 (13 x 13) 160 (14 x 14) 160 (15 x 15) 160 (16 x 16) 160 (4 x 40) 160 (8 x 20) 161 (14 x 14) 168 (17 x 17) 169 (13 x 13) 169 (17 x 17) 17 (1 x 17) 172 (16 x 16) 174 (17 x 17) 175 (14 x 14) 175 (15 x 15) 175 (16 x 16) 176 (15 x 15) 176 (16 x 16) 177 (15 x 15) 178 (18 x 18) 179 (15 x 15) 179 (18 x 18) 18 18 (1 x 18) 18 (2 x 9) 18 (3 x 6) 180 (14 x 14) 180 (15 x 15) 180 (17 x 17) 180 (18 x 18) 181 (14 x 14) 181 (15 x 15) 181 (17 x 17) 182 (14 x 14) 182 (18 x 18) 183 (14 x 14) 184 (15 x 15) 184 (17 x 17) 184 (25 x 25) 19 (1 x 19) 191 (18 x 18) 192 (14 x 14) 192 (16 x 16) 192 (17 x 17) 192 (25 x 25) 196 (14 x 14) 2 (1 x 2) 2 (2 x 1) 2 (Rectangular) 20 20 (1 x 20) 20 (2 x 10) 20 (20 x 1) 20 (4 x 5) 20 (5 x 5) 200 (21 x 21) 201 (15 x 15) 2011 (47 x 58) 207 (17 x 17) 208 (17 x 17) 209 (17 x 17) 2092 21 (1 x 21) 21 (3 x 7) 210 (17 x 17) 22 22 (1 x 22) 22 (2 x 11) 22 (5 x 5) 221 (18 x 18) 223 (18 x 18) 224 (18 x 18) 225 (15 x 15) 225 (17 x 17) 225 (18 x 18) 23 (1 x 23) 232 (17 x 17) 233 (18 x 18) 236 (17 x 17) 237 (17 x 17) 238 (19 x 19) 24 24 (1 x 24) 24 (12 x 2) 24 (2 x 12) 24 (2 x 4, 2 x 8) 24 (3 x 8) 24 (4 x 6) 24 (4x4) 240 (16 x 16) 240 (17 x 17) 241 (18 x 18) 241 (19 x 19) 243 (19 x 19) 25 (1 x 25) 25 (5 x 5) 250 (16 x 25) 255 (16 x 16) 256 (16 x 16) 256 (20 x 20) 256 (21 x 21) 257 (19 x 19) 257 (20 x 20) 257 (20 x 30) 26 (1 x 26) 26 (2 x 13) 260 (13 x 20) 261 (18 x 18) 262 (20 x 20) 265 (12 x 12) 27 (1 x 27) 27 (3 x 9) 272 (20 x 20) 273 (21 x 21) 279 (19 x 19) 28 28 (1 x 28) 28 (2 x 14) 28 (2 x 14), 14 Loaded 28 (2 x 14), 16 Loaded 28 (4 x 7) 28 (6 x 6) 280 (18 x 18) 280 (19 x 19) 281 (19 x 19) 289 (17 x 17) 29 (1 x 29) 292 (20 x 20) 293 (18 x 18) 296 (19 x 19) 299 (16 x 16) 299 (20 x 20) 3 (1 x 3) 3 (1 x 3), 2 Loaded 3 (3 x 1) 3 (Oval) 3 (Rectangular) 3 (Round) 30 (1 x 30) 30 (2 x 15) 30 (3 x 10) 30 (6 x 5) 300 (21 x 21) 304 (14 x 14) 305 (18 x 18) 309 (21 x 21) 31 (1 x 31) 32 32 (1 x 1) 32 (1 x 32) 32 (2 x 16) 32 (2 x 7, 2 x 9) 32 (4 x 8) 32 (9 x 9) 320 (19 x 19) 321 (17 x 17) 321 (19 x 19) 321 (21 x 21) 324 (18 x 18) 325 (18 x 18) 33 (1 x 33) 33 (3 x 11) 34 (1 x 34) 34 (2 x 17) 34 (2 x 8, 2 x 9) 35 (1 x 17, 1 x 18) 35 (1 x 35) 350 (35 x 36) 352 (26 x 26) 356 (26 x 26) 357 (19 x 19) 36 (1 x 36) 36 (2 x 18) 36 (3 x 12) 36 (4 x 9) 36 (6 x 6) 360 (19 x 19) 361 (18 x 18) 361 (19 x 19) 364 (17 x 17) 3647 365 (14 x 14) 365 (17 x 17) 369 (18 x 18) 37 (1 x 37) 37 (10 x 10) 370 (19 x 19) 372 (19 x 19) 38 (1 x 38) 38 (2 x 19) 381 (18 x 18) 383 (22 x 22) 388 (26 x 26) 39 (1 x 19, 1 x 20) 39 (1 x 39) 39 (3 x 13) 391 (18 x 18) 4 (1 x 4) 4 (2 x 2) 4 (4 x 1) 4 (Oval) 4 (Round) 40 40 (1 x 40) 40 (11 x 11) 40 (2 x 20) 40 (4 x 10) 40 (5 x 8) 400 (20 x 20) 401 (19 x 19) 403 (19 x 19) 41 (1 x 41) 411 (20 x 20) 419 (19 x 19) 42 (1 x 42) 42 (2 x 21) 42 (3 x 14) 42 (6 x 7) 420 (19 x 19) 420 (26 x 26) 428 (19 x 19) 429 (19 x 19) 43 (1 x 43) 432 (31 x 31) 44 44 (1 x 44) 44 (12 x 12) 44 (2 x 22) 44 (4 x 11) 44 (8 x 8) 441 (21 x 21) 447 (20 x 20) 45 (1 x 45) 45 (3 x 15) 45 (8 x 8) 456 (26 x 26) 46 (1 x 46) 46 (2 x 23) 462 (19 x 19) 463 (19 x 19) 47 (1 x 47) 4710 475 (21 x 21) 478 (26 x 26) 479 (26 x 26) 48 (1 x 24) 48 (1 x 48) 48 (2 x 24) 48 (3 x 16) 48 (4 x 12) 480 (29 x 29) 49 (1 x 49) 49 (7 x 7) 49 (Verification Required) 5 (1 x 5) 5 (Rectangular) 50 50 (1 x 50) 50 (2 x 25) 50 (5 x 10) 500 (30 x 30) 503 (22 x 22) 504 (29 x 29) 51 (1 x 25, 1 x 26) 51 (1 x 51) 51 (3 x 17) 52 52 (1 x 52) 52 (2 x 26) 52 (4 x 13) 52 (9 x 9) 520 (31 x 31) 528 (21 x 21) 529 (21 x 21) 53 (1 x 53) 539 (20 x 20) 54 (1 x 54) 54 (2 x 27) 54 (3 x 18) 545 (17 x 17) 55 (1 x 55) 559 (22 x 22) 56 (1 x 56) 56 (13 x 13) 56 (2 x 28) 56 (4 x 14) 56 (7 x 8) 56 (8 x 7) 56 (9 x 9) 560 (33 x 33) 565 (21 x 21) 57 (1 x 57) 576 (24 x 24) 576 (30 x 30) 58 (1 x 58) 58 (2 x 29) 59 (1 x 59) 59 (11 x 11) 599 (54 x 54) 6 6 (1 x 6) 6 (2 x 3) 6 (3 x 2) 60 (1 x 60) 60 (2 x 30) 60 (20 x 3) 60 (3 x 20) 60 (4 x 15) 60 (5 x 12) 60 (6 x 10) 600 (35 x 35) 604 (25 x 31) 61 (1 x 61) 62 (1 x 62) 62 (2 x 31) 625 (25 x 25) 63 (1 x 63) 64 64 (1 x 64) 64 (10 x 10) 64 (2 x 32) 64 (4 x 16) 64 (8 x 8) 65 (10 x 10) 65 (5 x 13) 652 (35 x 35) 66 (11 x 11) 66 (6 x 11) 68 68 (10 x 10) 68 (11 x 11) 68 (2 x 34) 68 (4 x 17) 68 (9 x 9) 685 (19 x 19) 69 (11 x 11) 7 (1 x 7) 72 (11 x 11) 72 (2 x 36) 72 (25 x 25) 72 (4 x 18) 73 (11 x 11) 75 (11 x 11) 75 (5 x 15) 76 (11 x 11) 76 (21 x 21) 771 (33 x 33) 78 (13 x 13) 78 (6 x 13) 8 8 (1 x 8) 8 (2 x 4) 8 (2 x 4), 4 Loaded 8 (4 x 2) 8 (Oval) 8 (Round) 80 (10 x 8) 80 (2 x 40) 80 (20 x 4) 80 (4 x 20) 80 (5 x 16) 81 (12 x 12) 81 (9 x 9) 84 84 (10 x 10) 84 (11 x 11) 84 (12 x 12) 84 (13 x 13) 84 (2x42) 84 (4 x 21) 84 (6 x 14) 85 (10 x 10) 85 (11 x 11) 85 (13 x 13) 87 (7 x 12) 88 (12 x 12) 88 (13 x 13) 88 (4 x 22) 89 (12 x 12) 89 (13 x 13) 9 9 (1 x 9) 9 (3 x 3) 90 (2 x 45) 90 (9 x 10) 939 (31 x 31) 940 (30 x 30) 947 (35 x 36) 95 (14 x 14) 96 (11 x 11) 96 (14 x 14) 96 (9 x 16) 97 (11 x 11) 97 (14 x 14) 988 (35 x 36) 989 (35 x 36) Custom	- 0.016" (0.40mm) 0.020" (0.50mm) 0.024" (0.60mm) 0.025" (0.64mm) 0.026" ~ 0.050" (0.65mm ~ 1.27mm) 0.028" (0.70mm) 0.031" (0.80mm) 0.033" (0.85mm) 0.035" (0.90mm) 0.036" (0.91mm) 0.037" (0.95mm) 0.039" (1.00mm) 0.040" (1.02mm) 0.043" (1.09mm) 0.050" (1.27mm) 0.070" (1.78mm) 0.100" (2.54mm) 0.150" (3.81mm) 0.157" (4.00mm) 0.200" (5.08mm)	- Custom Gold Nickel Nickel Boron Silver Tin Tin-Lead	- 1.00µin (0.025µm) 10.0µin (0.25µm) 100.0µin (2.54µm) 12.0µin (0.30µm) 135.0µin (3.43µm) 15.0µin (0.38µm) 150.0µin (3.81µm) 160.0µin (4.06µm) 180.0µin (4.57µm) 196.9µin (5.00µm) 20.0µin (0.51µm) 200.0µin (5.08µm) 25.0µin (0.63µm) 250.0µin (6.35µm) 29.5µin (0.75µm) 3.00µin (0.076µm) 3.90µin (0.099µm) 30.0µin (0.76µm) 35.4µin (0.90µm) 39.4µin (1.00µm) 5.00µin (0.127µm) 50.0µin (1.27µm) 500.0µin (12.70µm) 60.0µin (1.52µm) 78.7µin (2.00µm) 8.00µin (0.203µm) 80.0µin (2.03µm) Custom Flash	- Beryllium Copper Beryllium Nickel Brass Copper Alloy Nickel Boron Phosphor Bronze Phosphor Bronze Alloy Steel	- Chassis Mount Connector Panel Mount Surface Mount Surface Mount, Through Board Threaded Through Hole Through Hole, Bottom Entry; Through Board Through Hole, Kinked Pin Through Hole, Right Angle Through Hole, Right Angle, Horizontal Through Hole, Right Angle, Vertical	- Board Guide Board Guide, Closed Frame Board Guide, Flange Board Guide, Open Frame Carrier Carrier, Closed Frame Carrier, Elevated Carrier, Open Frame Closed Frame Closed Frame, Elevated Closed Frame, Seal Tape Custom Elevated Elevated, Open Frame Flange Open Frame Open Frame, Decoupling Capacitor Open Frame, No Center Bar Open Frame, Seal Tape Open Frame, Wash Away Programmable Spacer	- Press-Fit Solder Solder Cup Wire Wrap	- 0.016" (0.40mm) 0.020" (0.50mm) 0.024" (0.60mm) 0.025" (0.64mm) 0.028" (0.70mm) 0.031" (0.80mm) 0.033" (0.85mm) 0.034" (0.86mm) 0.035" (0.90mm) 0.036" (0.91mm) 0.037" (0.95mm) 0.039" (1.00mm) 0.040" (1.01mm) 0.043" (1.09mm) 0.050" (1.27mm) 0.070" (1.78mm) 0.100" (2.54mm) 0.150" (3.81mm) 0.157" (4.00mm) 0.200" (5.08mm) 0.234" (5.94mm)	- Copper Gold Nickel Nickel Boron Nickel Bronze Silver Tin Tin-Lead	- 1.00µin (0.025µm) 10.0µin (0.25µm) 100.0µin (2.54µm) 118.1µin (3.00µm) 135.0µin (3.43µm) 15.0µin (0.38µm) 150.0µin (3.81µm) 160.0µin (4.06µm) 180.0µin (4.57µm) 196.9µin (5.00µm) 20.0µin (0.51µm) 200.0µin (5.08µm) 25.0µin (0.63µm) 250.0µin (6.35µm) 29.5µin (0.75µm) 3.00µin (0.076µm) 30.0µin (0.76µm) 300.0µin (7.62µm) 35.0µin (0.90µm) 39.4µin (1.00µm) 47.2µin (1.20µm) 5.00µin (0.127µm) 50.0µin (1.27µm) 500.0µin (12.70µm) 60.0µin (1.52µm) 78.7µin (2.00µm) 8.00µin (0.203µm) 80.0µin (2.03µm) Flash	- Beryllium Copper Beryllium Nickel Brass Brass Alloy Brass, Copper Bronze Copper Copper Alloy Nickel Nickel Boron Phosphor Bronze Phosphor Bronze Alloy Steel	- Aluminum Alloy Diallyl Phthalate (DAP) Fluoropolymer (FP) FR4 Epoxy Glass Liquid Crystal Polymer (LCP) Liquid Crystal Polymer (LCP), Glass Filled Phenolic Plastic Polyamide (PA), Nylon Polyamide (PA), Nylon, Glass Filled Polyamide (PA46), Nylon 4/6 Polyamide (PA46), Nylon 4/6, Glass Filled Polyamide (PA66), Nylon 6/6 Polyamide (PA6T), Nylon 6T, Glass Filled Polyamide (PA9T), Nylon 9T, Glass Filled Polybutylene Terephthalate (PBT) Polybutylene Terephthalate (PBT), Glass Filled Polycarbonate Film Polycyclohexylenedimethylene Terephthalate (PCT), Polyester Polycyclohexylenedimethylene Terephthalate (PCT), Polyester, Glass Filled Polyester Polyester, Glass Filled Polyether Imide (PEI), Glass Filled Polyetheretherketone (PEEK), Glass Filled Polyethersulfone (PES) Polyethersulfone (PES), Glass Filled Polyphenylene Sulfide (PPS) Polyphenylene Sulfide (PPS), Glass Filled Polysulfone (PSU), Glass Filled Polytetrafluoroethylene (PTFE) Thermoplastic Thermoplastic, Glass Filled Thermoplastic, Polyester Thermoplastic, Polyester, Glass Filled	- -25°C ~ 100°C -25°C ~ 85°C -30°C ~ 85°C -40°C ~ 100°C -40°C ~ 105°C -40°C ~ 130°C -40°C ~ 170°C -40°C ~ 75°C -40°C ~ 80°C -40°C ~ 85°C -50°C ~ 105°C -50°C ~ 175°C -55°C ~ 105°C -55°C ~ 110°C -55°C ~ 125°C -55°C ~ 140°C -55°C ~ 150°C -55°C ~ 175°C -55°C ~ 250°C -55°C ~ 85°C -65°C ~ 105°C -65°C ~ 125°C -65°C ~ 175°C -65°C ~ 200°C 0°C ~ 105°C 105°C 150°C

全部重置

应用所有

结果:

IC 插座

图片	型号	库存	价格	数量	规格书	系列	包装	产品状态	类型	位置或引脚数量（网格）	配对间距	触点表面处理 - 配对	触点表面处理厚度 - 配对部分	触点材料 - 配对部分	安装类型	特性	端接方式	引脚间距	触点表面处理 - 引脚	触点表面处理厚度 - 引脚	触点材料 - 引脚	外壳材料	工作温度
	APH-0520-G-H APH-0520-G-H Samtec Inc.	1,971	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
	APH-0220-G-H APH-0220-G-H Samtec Inc.	3,115	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
	APH-0720-G-H APH-0720-G-H Samtec Inc.	4,663	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
	APH-0320-G-H APH-0320-G-H Samtec Inc.	4,969	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
	APH-1620-G-H APH-1620-G-H Samtec Inc.	1,858	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
	APH-1220-G-H APH-1220-G-H Samtec Inc.	1,382	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
	APH-0428-G-T APH-0428-G-T Samtec Inc.	3,864	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
	APH-0528-G-T APH-0528-G-T Samtec Inc.	3,111	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
	APH-0928-G-T APH-0928-G-T Samtec Inc.	2,966	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
	APH-0628-G-T APH-0628-G-T Samtec Inc.	4,498	-	立即询价	-	*	-	Active	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

共 4155 记录«上一页 1... 362 363 364 365366367 368 369...416 下一页»

搜索

产品

电话

会员

深圳市通胜兴电子有限公司