【经验】高性能低成本的板级EMI屏蔽解决方案——导电涂料和导电粘合剂
随着半导体技术的迅猛发展，越来越多的电子产品开始向便携式和小型化的方向发展，更小更轻已经是消费电子市场的普遍潮流。集成电路板是各种新型智能电器的核心，为了适应现代市场的需求，对于线路板（PCB）上的布线空间要求也越来越高，工程师被要求在尽量小的PCB板上集成尽量多的功能元件。这就会带来一个问题，那就是电路板上的EMI屏蔽问题，尤其是作为智能电器大脑的半导体芯片元件，对于电磁干扰是十分敏感的，而且不仅是需要屏蔽外来的EMI干扰，还有线路板上各元器件间的互相干扰问题。
图1
对于集成电路板上的这种EMI屏蔽需求，半导体技术专家和屏蔽应用专家都十分重视，经过多年努力研究，已经有了多种适用的解决方案。最传统的就是采用金属屏蔽罩，这种方案已经实行了很多年，不过由于其需要占据额外的安装空间，因此在现代电子产品市场中已经进入淘汰阶段。半导体行业给出的最新方案，是开发了一种新型的EMI屏蔽芯片，在半导体芯片封装的表面增加了一个导电层，该导电层接地至PCB的接地点。这个方案非常有效，符合了所有的应用需求，不过价格非常贵，而且必须在初期设计芯片时就确定方案设计，灵活性不是太好，方案修改比较困难。
而在屏蔽应用专家方面，对于这种应用给出了多个可行的解决方案，常见的有在半导体芯片上采用PVD沉积的方式镀上金属层，或者直接喷涂导电涂层，以及喷涂不导电吸波涂层，这三种方案。其中PVD沉积金属层的方案，虽然效果不错，但是工艺复杂、成本高，除非是特殊情况，一般不推荐。导电涂层和吸波涂层的这两种方案，工艺简单易操作，相应的设备投资也比较低，而实际测试的屏蔽效果却相当不错，可以说是高性能低成本的板级屏蔽解决方案。由于这两种方案的技术原理差别比较大，本文在这里就先介绍导电涂层方案的原理和应用特点。
导电涂层方案，是指在半导体芯片表面喷涂一层均匀的导电涂料产品，起到阻挡EMI干扰波和传导电磁能量的作用。这种方案一般用在PCB板上只有少数敏感元件的应用场合，因为涂料本身具有导电性能，因此只能选择性涂敷，不可能全板喷涂。美国PARKER CHOMERICS（派克固美丽）公司是一家世界知名的屏蔽材料生产厂家，该公司针对这种板级屏蔽需求开发了两种适用的导电涂料产品，CHO-SHIELD® 571和CHO-SHIELD® 604型，简单介绍一下这两款产品。
图2 CHO-SHIELD® 571型导电涂料
571型导电涂料是一款纯银微粒填充环氧树脂的产品，电气性能非常出色，屏蔽效能超过100dB。而且这款涂料的热膨胀系数（CTE）与市面上流行的半导体封装材料极为相似，因此在材料稳定性和配合度方面具有明显优势，非常适合半导体器件的板级应用。
图3 CHO-SHIELD® 604型导电涂料
604型导电涂料由纯银微粒填充聚氨酯制成，屏蔽效能大于70dB。这款产品在设计上主要针对半导体应用的工艺特点，具有特殊的活性周期，在室温下几乎不会固化，需要超过125℃，才会出现快速固化现象。这一优点对于半导体行业来说非常重要，能够极好的适应大批量流水线生产工艺，大大降低停机维护时间，提高生产效率。上一款571型作为半导体板级应用产品，也具有超长的12小时室温活性周期，不过这一款604型在这方面的优势更加明显。
图4 CHO-BOND® 592型导电粘合剂
顺便介绍一下，上图这款CHO-BOND® 592型导电粘合剂，也经常会出现在半导体的板级应用中。大多用于电路板修补，或者特殊情况下的元件安装方案。粘合剂本身具有很强的导电性能，可以在板级应用环境中，作为屏蔽应用的修补剂或者小缝隙填充剂使用。
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型号- CHO-TM101,CHO-SEAL 1285,L6303,CHO-SEAL 6452,CHO-SEAL 6330,CHO-SEAL®,CHO-SEAL 6371,CHO-SEAL 6370,1217,1215,1212,CHO-SEAL V6433,1298,6502,CHO-SEAL 1239,CHO-SEAL L6303,6503,6308,CHO-SEAL 1310,6307,V6433,CHOSEAL 6503,CHO-SEAL 6460,CHOSEAL 6502,1273,1350,CHO-SEAL S6600,1270,1224,1221,6435,S6600,CHO-SEAL 1401,CHO-SEAL 1287,6452,6330,1285,6371,6370,1239,1310,CHO-SEAL 1215,CHO-SEAL 1217,CHO-SEAL 6308,CHO-SEAL 6307,CHO-SEAL 1298,CHO-SEAL 6503,CHO-SEAL 6502,CHO-SEAL 1212,CHO-SEAL® 1215,CHO-SEAL 1273,CHO-SEAL 1350,6460,CHO-SEAL 1270,CHO-SEAL S6305,56600,1401,1287,CHO-SEAL 1221,CHO-SEAL 1224,CHO-SEAL,S6305,CHO-SEAL 6435
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目录- Company Profile and Products introduction Electromagnetic Compatibility Overview EMI SHIELDING DESIGN Special Applications Knitted Wire Mesh Metal Fibers and Screens Oriented Wires Conductive Elastomer EMI Shielding Windows Air Vent Panels Conductive Systems Products Shielding Components Beryllium Copper Gaskets Fabric-over-Foam Gaskets EMI Shielding Products Glossary and Appendix
型号- 82-12916,21-13910,82-12911,21-13911,21-13912,60-02010,21-13913,60-02011,21-13914,60-02012,21-13915,60-02013,21-13916,60-02014,21-13917,60-02015,21-13918,60-02005,88-12342,60-02006,60-02007,60-02008,60-02009,48-00476,43-46210,88-12347,21-13900,82-12921,21-13901,XX-X1500,21-13902,60-02002,60-02003,60-02004,21-13907,XX-X1506,21-13908,XX-X1505,21-13909,XX-X1508,XX-X1507,XX-X1502,XX-X1501,XX-X1504,XX-X1503,48-00481,88-12337,73-00081,XX-X1509,60-02030,21-13933,60-02031,21-13934,60-02032,21-13935,60-02033,43-13794,60-02027,60-71043,60-02028,60-71044,60-02029,88-12362,60-71042,60-71047,60-71048,60-71045,60-71046,86-10094,89-50010,43-43162,86-10093,89-50012,86-10090,89-50014,86-10092,89-50016,86-10091,86-10076,84-70079,86-10075,89-7XXXX,21-13920,86-10077,84-70076,84-70075,60-02020,84-70078,60-02021,84-70077,60-02022,84-70072,60-02023,84-70071,60-02024,84-70074,60-02025,84-70073,60-02026,88-12352,60-02016,43-46208,60-02017,60-02018,43-46206,60-02019,88-12357,89-50020,89-50021,86-10082,89-50022,43-00003,89-50023,43-43175,89-50024,43-43178,72-08116,89-50025,43-00000,89-50026,89-50027,86-10080,73-00025,60-02052,60-02053,43-13335,60-02054,43-13334,60-02055,88-12392,60-02056,60-02057,60-02058,60-02059,84-70070,89-50070,89-50072,89-50074,CS 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Parker Chomerics（派克固美丽）导电特种材料选型指南
描述- Parker is the global leader in motion and control technologies, providing precision-engineered solutions for a wide variety of mobile, industrial and aerospace markets. Parker can be found on and around everything that moves.
型号- CHO-SHIELD 571,52-01-2001-0000,50-30-0584-0029,CHO-LUBE 4220,52-01-0571-0000,50-10-1086-0000,52-03-2056-0000,CHO-BOND 2165,CHO-SHIELD 608,CHO-BOND 1077,596,52-00-2002-0000,52-00-2003-0000,51-02-4669-0000,50-33-1038-0000,50-01-0584-0208,50-00-1091-0000,CHO-SHIELD 604,72-00002,72-00005,CHO-BOND 1075,52-03-2044-0000,50-05-0580-0208,50-02-1030-1000,4220,50-01-1030-0000,2044,2040,52-01-2002-0000,50-00-0584-0208,52-00-2001-0000,54-01-4220-0000,CHO-SHIELD 4994,CHO-SHIELD 2056,CHO-SHIELD 596,50-01-2165-0000,2056,52-01-0579-0000,50-01-1085-0000,52-01-0604-0000,50-04-2165-0000,52-01-0596-0000,52-04-4994-1000,52-03-0610-0000,CHO-SHIELD 2044,50-01-1075-0000,50-10-0584-0029,52-00-2002-1000,50-02-1038-0000,CHO-SHIELD 4900,50-02-1075-1000,50-00-1029-0000,50-01-1091-0000,CHO-SHIELD 2040,CHO-SHIELD 579,4994,50-00-0584-0029,CHO-SHIELD 610,CHO-SHIELD 576,72-08116,CHO-BOND 584-208,52-04-2002-0000,CHO-BOND 580-208,CHO-BOND 360-20,CHO-BOND 1029,52-01-0576-0000,CHO-LUBE E117,50-02-1038-1000,50-01-0580-0208,CHO-BOND 1035,52-04-0608-0000,51-05-4669-0000,TECKNIT 8116,50-03-0584-0029,50-02-1077-0000,CHO-BOND 4669,CHO-BOND 1038,52-04-2001-0000,50-02-1016-0000,CHO-BOND 1030,52-00-2001-1000,CHO-BOND 4660,51-00-1035-0000,2001,CHO-BOND 1019,50-00-0360-0020,50-02-0584-0029,52-03-4994-1000,50-01-1121-0000,52-00-2003-1000,604,CHO-SHIELD 1091,608,50-02-1075-0000,50-31-1038-0000,TECKNIT 0005,51-01-1035-000,TECKNIT 0002,50-04-1086-0000,50-01-1077-0000,50-01-1029-0000,51-02-4660-0000,50-02-1030-0000,571,51-05-4660-0000,576,610,CHO-BOND 1016,2003,50-01-1038-0000,54-01-E117-0200,2002,51-00-1035-1000,50-01-0584-0029,50-02-2165-0000,CHO-SHIELD 2002,52-00-0596-0000,CHO-SHIELD 2003,54-02-4220-0000,CHO-SHIELD 2001,50-01-1019-0000,52-01-2003-0000,50-01-1016-0000,CHO-BOND 1121,50-01-0360-0020,52-03-2040-0000,52-04-2003-0000,50-01-1086-0000,52-02-4900-0000,CHO-BOND 584-29,CHO-BOND 1085,CHO-BOND 1086
CHO-SHIELD® 2000 SERIES Corrosion-Resistant Conductive Coatings
型号- 52-01-2001-0000,CHO-SHIELD 2002,52-04-2002-0000,CHO-SHIELD 2003,CHO-SHIELD 2001,52-00-2002-1000,CHO-SHIELD® 2001,CHO-SHIELD® 2000,52-01-2003-0000,CHO-SHIELD® 2003,CHO-SHIELD® 2002,52-00-2002-0000,CHO-SHIELD® 2000 SERIES,52-04-2001-0000,52-00-2003-0000,52-00-2003-1000,52-04-2003-0000,52-01-2002-0000,52-00-2001-0000,52-00-2001-1000
Parker Chomerics 产品概述
型号- CHO-TOUCH™,CHO-STRAP®,CHO-SEAL®,STREAMSHIELD OMNI-CELL® SHIELD-CELL,T-WING®,CHO-MUTE®,CHO-MASK®,SPRING-LINE®,DURALAN™,CHO-BOND®,CHO-FAB®,THERM-A-GAP™,WIN-SHIELD®,CHO-SORB®,THERM-A-FORM™,CHO-THERM®,THERMFLOW®,CHO-SHRINK®,THERMATTACH®,METALASTIC®,PREMIER™,CHO-FOIL®,CHO-LUBE,SOFT-SHIELD®,CHO-FORM®,POLA®,TECKFILM™,CHO-SHIELD®
CHO-BOND® 1018 & CHO-BOND® 1019 Instructions for Painting & Powder Coating
型号- 50-01-1018-0000,CHO-BOND 1018,CHO-BOND 1019,50-01-1019-0000,CHO-BOND® 1019,50-02-1018-0000,CHO-BOND® 1018
【产品】填充银片的单组分丙烯酸导电涂料CHO-SHIELD 2040，适用于塑料EMI/RFI屏蔽
Parker Chomerics推出的CHO-SHIELD 2040是一种填充银片的单组分丙烯酸导电涂料，它专门为在塑料上的应用提供卓越的EMI/RFI屏蔽性能。该涂料配方稳健，适用于大小体积涂装过程。
【产品】可屏蔽EMI、剥离膜易去除的金属箔胶带CHO-MASK®II系列，可提供导电和耐腐蚀的表面处理
Parker Chomerics推出CHO-MASK®II系列的抗EMI金属箔胶带，包括Standard Tack（ST）和High Tack（HT）两，可为喷漆后的金属电子器材提供导电、耐腐蚀的表面。 CHO-MASK II胶带由1盎司 （28.4克）或2盎司（56.7克）的镀锡铜箔上覆盖一层凹进的聚酯漆掩膜构成。 金属箔的反面具有可导电的压力敏感粘合剂（PSA）。
Parker Chomerics Specialty Materials Product Shelf Life Data
型号- CHO-SHIELD 571,CHO-BOND 580-208,CHO-SHIELD 4994,TECKNIT 0005,TECKNIT 0002,CHO-SHIELD 2056,CHO-SHIELD 596,CHO-BOND 360-20,CHO-BOND 1029,CHO-LUBE 4220,CHO-BOND 2165,CHO-SHIELD 608,CHO-BOND 1077,CHO-BOND 1035,TECKNIT 8116,CHO-BOND 1016,CHO-BOND 1038,CHO-BOND 4669,CHO-BOND 592,CHO-SHIELD 568,CHO-SHIELD 604,CHO-BOND 1030,CHO-BOND 4660,CHO-BOND 1075,CHO-SHIELD 2002,CHO-SHIELD 2003,CHO-SHIELD 2044,CHO-SHIELD 2001,CHO-BOND 1019,CHO-BOND 1121,CHO-SHIELD 2040,CHO-SHIELD 579,CHO-SHIELD 610,CHO-SHIELD 576,CHO-BOND 584-29,CHO-SHIELD 1091,CHO-BOND 1085,CHO-BOND 584-208,CHO-BOND 1086
电子商城
品牌：ROGERS
品类：Thermally and Electrically Conductive Adhesive
价格：￥3,366.3686
现货： 0
品牌：ROGERS
品类：Thermally and Electrically Conductive Adhesive
价格：￥5,175.6199
现货： 0
品牌：ROGERS
品类：Thermally and Electrically Conductive Adhesive
价格：
现货： 0
服务
使用FloTHERM和Smart CFD软件，提供前期热仿真模拟、结构设计调整建议、中期样品测试和后期生产供应的一站式服务，热仿真技术团队专业指导。
实验室地址： 深圳 提交需求>
提供多种可压缩材料如导热硅胶、散热垫片、各种相变材料以及其他粘合剂和固体试样的材料导热系数测试，给出测试结果及数据解析报告；测试范围：最大加热电流5A；热阻范围：0.01K/W-5K/W。
实验室地址： 深圳 提交需求>
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