【成功案例】应用Laird导电泡棉成功解决车载音响ESD失效问题

时间： 2018-06-11 来源：世强

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车载电子EMC法规中对ESD（静电放电）实验的要求严苛，我们的一款车载音响产品中，收音机模块受到ESD干扰导致输出音量变小，经多次尝试，最后采用LAIRD依照笔者案例的实际情况设计的导电泡棉放置于合适的位置将静电及时释放，最终顺利的解决了问题。

导电泡棉的一个作用是屏蔽，另一个作用是左两导体的低阻抗搭接桥梁，利于将一个导体上的静电噪声迅速通过此桥梁释放到另一个导体上，以免噪声干扰第一个导体附近的电路，从而解决ESD问题。

实验现象及分析

当产品运行Tuner（AM或FM收音）模式时，将静电枪对准下面左侧图红圈内的螺丝打空气放电±15KV时，喇叭输出音量变小。

下面左侧图红圈内的螺丝跟右下图红圈内螺丝孔是锁在同一颗螺丝钉上的，右下图的金属为tuner的屏蔽罩，屏蔽罩跟竖在主板上的tuner小板搭接在一起，tuner小板里包含有tuner芯片，左下图的两个小接口件即为tuner小板上的tuner接口。

初步分析，tuner 模式失效，但其他模式正常，并且控制音量没有减小，经测量tuner芯片的输出变小了，简单原理图如下：

推断是小板与主板的地连接比较薄弱，导致静电不能及时放掉，使得Tuner芯片内部受到静电干扰导致输出其输出量变小。

对策及结果

（1）强化Tuner 小板与主板之间GND连接，屏蔽罩连接板子的插孔用焊锡连接；扩大连接处的接地；Tuner板悬空pin接地：

（2）对结构件整改减小ESD影响，Tuner屏蔽罩换成无孔：

经修改后进行测试，上述的（1）（2）对策均无效。

（3）在屏蔽罩和车载音响金属外壳间加导电泡棉，使得屏蔽罩上拾取的静电通过导电泡棉快速的流到金属外壳去，避免干扰到Tuner芯片，经测试，结果OK，顺利通过客户的ESD法规检验。

导电泡棉的选择

Laird 是一家专注于型材和输入/输出（I/O）EMI 屏蔽衬垫的综合性制造商，他们致力于新产品开发，生产满足或优于法规要求的产品，有各种式样的导电泡棉可供客户选择，也可为客户定制导电泡棉，因此上述对策中我们采用的是Laird的导电泡棉。

Laird的导电泡棉表面为耐磨金属织物，避免性能下降，其表面电阻率可低至0.07欧姆/平方厘米，产品能工作的温度范围从-40°C至85°C，完全可以满足车载电子的要求，Laird导电泡棉外表面的的构成材料可用镍/铜（Ni/Cu）和锡/铜（Sn/Cu）两种，根据实测效果，我们选择了锡/铜导电泡棉（Sn/Cu导电泡棉）。

导电泡棉的尺寸和形状方面，因为Tuner屏蔽罩跟音响上侧金属外壳之间的空间距离为10mm，且这个空间放置矩形的导电泡棉更能增大搭接面积、减小搭接阻抗，因此我们最终选择了型号（料号）为4172的矩形导电泡棉，其宽10mm，高15mm，高度从15mm压缩到10mm后有33%的压缩量，足以产生比较低的搭接阻抗。

选择Laird此型号的导电泡棉装了三台机器，三台均顺利通过ESD测试，证明此对策有效。

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全部评论（15）

jingshui Lv7. 资深专家 2019-05-15

学习了
嘟嘟星魂 Lv8. 研究员 2018-12-25

学习了
强达电路 Lv5. 技术专家 2018-12-20

学习了
daniel Lv7. 资深专家 2018-12-18

学习
wch7475 Lv8. 研究员 2018-12-18

学习了

Harlin Lv5. 技术专家 2018-12-14

好文！
ook Lv6. 高级专家 2018-12-13

很好的经验
风行者 Lv4. 资深工程师 2018-12-12

好
xingwangjy Lv4. 资深工程师 2018-12-07

学习了
tommy Lv7. 资深专家 2018-12-03

实用干货资料

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Laird（莱尔德）EMI产品选型指南

目录- EMI INTRODUCTION & SUMMARY BOARD LEVEL SHIELDS FINGERSTOCK VENT PANELS FABRIC-OVER FOAM ELECTRICALLY CONDUCTIVE ELASTOMERS MICROWAVE ABSORBERS

型号- 8863-0150,8404-0121-XX,8906-0171-XX,8560-0099-XX,8904- 0129-XX,8907-0140-XX,8104-0104-40,8410-0105-50,8516-0201-XX,8908-0108-XX,BMI-S-209-F,8856-01C3,4740,8401-0133-XX,8863-0140,8863-0145,8907-0174-XX,8563-0133-XX,8563-0108-XX,8403-0106-50,8563-0213-XX,8901-0117-XX,8403-0105-XX,8863-0130,8863-0135,4741,4742,4744,4502,8412-01XX-54,8412-01XX-52,8915-0130-XX,8408-0251-XX,8901-0176-XX,8412-01XX-55,4520,8918-0105-XX,8402-01XX-XX,8412-01XX-50,8415-0112-64,8413-0105-64,8863-0120,4518,8904-0129-XX,8901-0140-XX,8103-0101-40,8863-0125,4512,4513,8401-0121-XX,4516,4517,8563-0131-XX,4531,8863-0196,8401-0155-XX,8412-01XX-61,8412-01XX-60,8863-0197,8560-0143-XX,4N64EF51N00225,4529,4N64EM51N00171,8863-0198,8863-0199,8103-0125-40,8907-0129-XX,4522,4524,4525,8908-0180-XX,4528,2238 -.25,8563-0077-XX,8103-0113-40,BMI-S-207-F,4541,4542,4N64ER51N00225,8863-0180,8104-01XX-48,8104-01XX-49,8908-0118-XX,8415-0110-64,8863-0183,8516-0211-XX,8863-0184,8909-0122-XX,4532,BMI-S-305,8905-0157-XX,4533,4534,4536,4537,SNC70-RXP,8401-0123-XX,8868-0085,8560-0330-XX,8903-0171-XX,4791,4N64EP51N00171,4792,88980001XXA,4795,8863-0170,8401-0111-XX,8905-0180-XX,8863-0175,8409-0173-50,8868-0084,8868-0081,8902-0135-XX,8904-0105-XX,8563-0089-XX,8860-0093-100-XX,4302,4786,4787,4788,4789,4548,8563-0165-XX,8902-0101-XX,8868-0075,4320,8863-0160,8101-0104-40,8868-0070,8863-0165,8409-0106-50,88900001XXA,8414-0108-64,8402-0102-XX,4796,4797,4798,8403-0115-XX,S363-0120,4315,4799,8563-0143-XX,8563-0106-XX,*4500,4571,*4501,4330,4573,8910- 0125-XX,4575,323S,8860-0093-324-XX,8416-0320-22,8401-0113-XX,97-568*,8563-0090-XX,2388,8904-0137-XX,4325,4568,8404-0118-XX,8416-0120-23,8912-0140-XX,8101-01XX-49,8101-01XX-48,8101-01XX-47,4582,8412-0104-50,4583,4584,4100,8903-0122-XX,8101-0102-40,8101-01XX-41,8417-3XXX-62,8101-01XX-40,8416-0320-21,4N64EW51N00281,8103-0103-40,*77-091,4579,4339,8563-0279-XX,8909-0178-XX,8410-0107-50,8890-MGS103072-93,8908-0157-XX,4591,4593,4594,4110,4111,4112,4596,8414-0104-64,4597,4355,4113,77-090B,8408-0212-XX,8903-0110-XX,8563-0255-XX,2240 -.25,77-110,8911-0102-XX,4105,4106,8104-0106-40,8401-0101-XX,4349,8103-0115-40,4360,4361,4120,8300-0100-44,8906-0116-XX,4363,4121,4123,4365,8563-0079-XX,8860-0093-300-XX,77-100,77-101,4356,4114,8908-0101-XX,8402-0106-XX,4599,4357,4115,8102-0209-40,4358,5206,4359,4117,8907-0107-XX,8902-0108-XX,4370,*4300,8406-01XX-55,4372,8907-0109-XX,8406-01XX-54,4131,97-630,8403-0107-XX,97-631,4375,4133,97-632,4134,4376,8416-0120-57,97-633,8563-0211-XX,97-634,8916-0135-XX,8563-0080-XX,8906-0175-XX,8401-0103-XX,8406-01XX-60,4368,4126,8563-0257-XX,8862-0105,8907- 0129-XX,8104-0108-40,SNN60-RXP,8910-0125-XX,8862-0100,8406-01XX-61,4N64EK51N00138,8905-0116-XX,8413-0103-64,4142,8860-0032-324-XX,8909-0102-XX,4143,97-620,97-621,4387,97-622,97-623,97-624,8860-0032-150-XX,8908-0177-XX,8401-0137-XX,97-627,97-628,97-629,8404-0108-XX,8402-0104-XX,8912-0150-XX,8414-0106-64,4136,8408-0200-XX,4379,8102-0207-40,8909-0168-XX,8406-01XX-52,8563-0128-XX,8406-01XX-50,4392,4150,4394,97-610,97-611,4157,97-612,97-613,97-614,8904-0125-XX,97-615,97-616,SNL60-RXP,97-618,8560-0145-XX,97-619,4391,8903-0156-XX,8560-0097-XX,*77-083,*77-084,*77-085,8901-0107-XX,4389,8906-0118-XX,4148,*77-082,8516-0203-XX,4161,4163,8412-0102-50,4164,8563-0327-XX,8904-0170-XX,8563-0069-XX,4168,97-603,97-604,97-605,0095-X997-00,8901-0130-XX,97-606,97-607,4160,*77-078,*77-079,M83528/002X006,8103-0105-40,8907-0176-XX,8862-0114,4158,8862-0113,8401-0125-XX,8862-0112,4172,4173,8864-2618,4176,8907-0157-XX,8906-0107-XX,4179,97-438,4170,4171,8912-0102-XX,89XX-01XX-43,8103-0106-40,89XX-01XX-42,8918-0135-XX,89XX-01XX-40,77-106D,4169,8860-0100-100-XX,4184,8403-0112-XX,4186,8104-0109-40,4189,4N64EH51N00290,3363-0197,8864-3714,4181,BMI-S-201-F,8864-3715,4182,8401-0127-XX,2238 - S,77-105C,8402-0108-XX,843X-2XXX-X,8911-0145-XX,8414-01XX-65,8414-01XX-64,8404-0115-XX,4194,97-650,8103-0118-40,4198,8907-0180-XX,4199,8403-01XX-55,8403-01XX-54,8560-0311-XX,8403-01XX-52,8902-0150-XX,4192,8401-0115-XX,8403-01XX-50,8860-0125-300-XX,8408-0245-XX,3027-235,8563-0161-XX,BMI-C-010-*,8905-0137-XX,8910-0140-XX,97-640,8408-0209-XX,8904-0168-XX,8409-0158-50,8403-0101-50,97-645,97-646,8911- 0125-XX,8403-01XX-60,8913-0140-XX,8403-01XX-61,8415-0106-64,8914- 0130-XX,8909-0105-XX,8902-0117-XX,8563-0116-XX,8404-0105-XX,BMI-S-210-F,8401-0117-XX,M83528/009X002,M83528/009X001,8904-0156-XX,8864-0231,8516-0205-XX,M83528/009X005,8560-0435-XX,M83528/009X004,8410-0101-50*,8563-0071-XX,M83528/009X003,M83528/009X009,M83528/009X008,M83528/009X007,8904-0110-XX,8409-0168-50,8408-0257-XX,8864-3515,3078-500,8563-0254-XX,8910-0105-XX,8415-0104-64,8907-0101-XX,8300-0038-44,8403-0109-XX,8906-0109-XX,8563-0095-XX,8103-0108-40,8911-0135-XX,8860-0032-300-XX,8902- 0129-XX,8901-0110-XX,8905-0175-XX,8915- 0130-XX,8414-01XX-56,SNK55-RXP,8401-0105-XX,97-440,8403-0110-XX,8902-0174-XX,8917-0130-XX,8102-0205-40,8414-0103-64,BMI-C-006,5092,BMI-C-002,BMI-C-001,BMI-C-004,8913-0150-XX,8904-0178-XX,M83528/009X013,M83528/009X012,M83528/009X011,M83528/0

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【选型】Laird（莱尔德）导电胶带选型指南

目录- 单面导电织物胶带双面导电织物胶带导电转移胶带应用技术与注意事项

型号- 87580-250,87 系列,96249,DT06B,LT591,DT10C,GT 系列,86748,LT350,96 系列,591 系列,86205,87580-751,86785,LT315,LT210,DN50A,LT212,87580,86250,86 系列,LT87,LT209,DT03B,DT17A,81720,LT307C,LT209HT,LT210H,85785,LT301,86750,86773,87580-285,HT 系列,10U 系列

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CF700系列EcoFoam™导电泡棉

描述- Laird的Ecofoam™ CF700系列导电泡沫提供了一种创新的屏蔽和接地解决方案，具有X、Y和Z轴电导率，适用于满足现代计算机、电信和其他电子设备对电磁干扰（EMI）屏蔽效果的需求。该产品一面带有导电PSA胶带，可定制以满足不同形状的应用需求，特别适合于低循环应用，如输入/输出（I/O）屏蔽和其他非剪切标准连接器。

型号- ECOFOAM™ CF700 SERIES,ECOFOAM™ CF700,CF700,CF715HA01050200,CF700 SERIES,ECOFOAM™

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【选型】Laird（莱尔德）导电布包覆泡棉 (FOF) EMI 衬垫选型指南

目录- 导电布包覆泡棉衬垫介绍 FOF系列EMI衬垫 FOF系列EMI衬垫设计指南/保质期/储存条件

型号- 709,77A,H1K,59L,51G,56L,51H,285,X1G,X6L,51N,70L,773,203,775,779,519,618

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【选型】Laird（莱尔德）EMI屏蔽产品选型指南

目录- 空心圆屏蔽套带鳍空心圆屏蔽套空心双圆屏蔽套带有PSA超柔屏蔽套鳍单圆垫圈单鳍双圆垫圈立方体垫圈圆柱垫圈带有PSA的密封垫圈带有PSA的双密封垫圈超柔导电材料海绵内芯长方体垫圈海绵内芯圆柱垫圈有机硅管圆柱垫圈单鳍海绵内芯垫圈双鳍海绵内芯垫圈有机硅管单鳍垫圈有机硅管双鳍垫圈导电接地EMI垫圈导电网带超柔编制垫圈

型号- 8401-0142,8904-0117-XX,8902-0156,8902-0150,8909-0118,8404-0121-XX,8906-0171-XX,8907-0140-XX,8410-0105-55,8104-0104-40,8410-0105-50,8908-0108-XX,8405-0103-50,8918-0175,8401-0133-XX,8902-0140,8910-0108,8910-0102,8406-0106-50,8910-0105,8907-0174-XX,8909-0125,8417-3064-62,8401-0155,8909-0122,8403-0106-50,8902-0174,8902-0176,8403-0105-XX,8901-0117-XX,8902-0171,8902-0170,8915-0130-XX,8901-0176-XX,8918-0105-XX,8910-0122,8413-0105-64,8415-0112-64,8904-0129-XX,8901-0140-XX,8103-0101-40,8910-0125,8417-3052-62,8401-0121-XX,8909-0145,8901-0107,8401-0155-XX,8103-0125-40,8907-0129-XX,8901-0101,8901-0102,8405-01,8909-0157,8908-0180-XX,8103-0113-40,8909-0170,8415-0110-64,8908-0118-XX,8901-01,8417-3054-62,8909-0122-XX,843,8406-0116-50,8905-0157-XX,8909-0168,8401-0123-XX,8903-0171-XX,8401-0111-XX,8905-0180-XX,8409-0173-50,8902-0135-XX,8904-0105-XX,8903-0177,8903-0175,8903-0176,8909-0175,8903-0171,8909-0174,8909-0178,8902-0101-XX,8101-0104-40,8409-0106-50,8414-0108-64,8402-0102-XX,8403-0115-XX,8903-0180,8401-0113-XX,8904-0137-XX,8401-0126-44,8404-0118-XX,8912-0140-XX,8412-0104-50,8903-0122-XX,8101-0102-40,8417-3050-62,8415-01,8103-0103-40,8909-0178-XX,8101-01,8410-0107-50,8908-0157-XX,8406-0104-50,8414-0104-64,8903-0110-XX,8911-0102-XX,8403-01,8104-0106-40,8401-0101-XX,8401-0114-42,8103-0115-40,8906-0116-XX,8300-0100-44,8402-0106-XX,8908-0101-XX,8102-0209-40,8902-0108-XX,8907-0107-XX,8413-0103-56,8907-0109-XX,8902-0110,8403-0107-XX,8406-0102-50,8916-0135-XX,8417-3072-62,8401-0103-XX,8906-0175-XX,8902-0117,8902-0116,8104-0108-40,8902-0118,8910-0125-XX,8905-0116-XX,8413-0103-64,8909-0102-XX,8902-0102,8902-0101,8908-0177-XX,8401-0137-XX,8404-0108-XX,8910-0140,8402-0104-XX,8912-0150-XX,8414-0106-64,8902-0108,8102-0207-40,8902-0107,8909-0168-XX,8902-0109,8902-0135,8902-0137,8910-0178,8417-3,8904-0125-XX,8910-0174,8903-0156-XX,8917-0130,8901-0107-XX,8906-0118-XX,8902-0122,8405-0101-50,8412-0102-50,8904-0170-XX,8912-0117-XX,8901-0130-XX,8402-0103,8402-0102,8402-0101,8909-0105,8413-01,8402-0107,8406-0114-50,8402-0106,8103-0105-40,8402-0105,8907-0176-XX,8402-0104,8909-0108,8402-0109,8402-0108,8902-0129,8417-3062-62,8401-0125-XX,8909-0102,8909-0101,8103-01,8907-0157-XX,8906-0107-XX,8903-0177-XX,8912-0102-XX,8103-0106-40,8918-0135-XX,8904-0168,8402-0109-42,8403-0112-XX,8104-0109-40,8406-0101-50,8904-0171,8401-0127-XX,8904-0170,8904-0175,8904-0178,8402-0108-XX,8904-0177,8904-0176,8911-0145-XX,8404-0115-XX,8908-0178,8103-0118-40,8908-0177,8908-0174,8907-0180-XX,8403-0101-42,8902-0150-XX,8401-0115-XX,8904-0180,8412-01,8406-0113-50,8908-0180,8406-0101-55,8905-0137-XX,8910-0140-XX,8908-0168,8412-0106-50,8904-0168-XX,8403-0101-50,8409-0158-50,8913-0140-XX,8415-0106-64,8908-0170,8908-0171,88401-0108,8909-0105-XX,8904-0129,8902-0117-XX,8404-0105-XX,8401-0117-XX,8406-0111-50,8904-0156-XX,8409-0168-50,8904-0110-XX,8904-0125,8904-0130,8417-3060-62,8910-0105-XX,8415-0104-64,8902-0140-XX,8904-0137,8907-0101-XX,8403-0109-XX,8300-0038-44,8906-0109-XX,8103-0108-40,8911-0135-XX,8901-0110-XX,8905-0175-XX,8904-0145,8401-0105-XX,8403-0110-XX,8902-0174-XX,8102-0205-40,8917-0130-XX,8414-0103-64,8401-0118-42,8417-3059-62,8913-0150-XX,8904-0178-XX,8902-0129-XX,8904-0157,8904-0156,8300-0225-44,8912-0122-XX,8911-0117,8908-0118,8404-0101-XX,8414-0111-64,8410-01,8409-0126-50,8906-0156-XX,8901-0140,8409-01,8401-0107-XX,8908-0101,8102-0203-40,8906-0110-XX,8901-0137,8907-0137-XX,8908-0109,8908-0107,8911-0125,8403-8XXX-XX,8908-0108,8911-0122,8901-0130,8401-144-XX,8901-0156-XX,8903-0175-XX,8915-0150-XX,8904-0109-XX,8417-3055-62,8403-0114-XX,8901-0116,8903-0116-XX,8901-0117,8901-0118,8901-0168-XX,8902-0170-XX,8908-0171-XX,8911-0108,8101-0108-40,8401-0129-XX,8410-0102-55,8911-0102,8409-0102-50,8401-0108-42,8410-0102-54,8409-0161-50,8410-0102-50,8906-0178-XX,8901-0110,8901-0102-XX,8908-0157,8910-0174-XX,8901-0180,8904-0107-XX,8905-0177-XX,8911-0108-XX,8401-0109,8401-0107,8401-0105,8401-0106,8401-0103,8401-0104,8401-0101,8401-0102,8918-0135,8414-0101-64,8403-0103-50,8403-0102-XX,8417-3057-62,8902-0137-XX,8904-0130-XX,8901-0170,8907-0170-XX,8101-0106-40,8904-0176-XX,8401-0118,8401-0119,8409-0104-50,8401-0116,8901-0177,8401-0117,8401-0114,8401-0115,8401-0112,8401-0113,8401-0110,8401-0111,8410-0104-50,8901-0176,8401-0120,8918-0105,8404-0103-XX,8909-0174-XX,8401-0119-XX,8911-0130,8104-0102-40,8911-0135,8401-0129,8401-0127,8401-0125,8901-0168,8401-0126,8401-0123,8401-0124,8401-0120-XX,8401-0121,8401-0122,8417-3067-62,8401-0131,8908-0122,8103-0111-40,8906-0168-XX,8908-0129,8908-0125,8911-0140,8911-0145,8406-0108-50,8406-0131-50,8415-0102-64,8901-0156,8401-0137,8401-0134,8401-0142-XX,8401-0133,8412-0101-50,8908-0178-XX,8906-0180,8409-0117-50,8903-0125-XX,8103-0112-40,8905-0109-XX,8909-0101-XX,8413-0104-64,8902-0156-XX,8404-0109-XX,8902-0110-XX,8417-3053-62,8906-0178,8904-0175-XX,8401-0122-XX,8906-0174,8906-0175,8906-0177,8906-0170,8906-0171,8914-0130,8403-0107-50,8417-3065-62,8907-0116-XX,8905-0107,8403-0106-XX,8901-0118-XX,8905-0102,8905-0178-XX,88403-0114,8914-0150-XX,8906-0168

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CF800系列EcoFoam™黑色导电泡棉

描述- Laird的EcoFoam™ CF800系列是一种黑色导电泡沫，提供X、Y和Z轴电导率，增强屏蔽效果以满足现代计算机、电信和其他电子设备对电磁干扰（EMI）屏蔽的需求。该产品具有优异的Z轴导电性，适用于低循环应用，如输入/输出（I/O）屏蔽和其他非剪切标准连接器。

型号- ECOFOAM™ 800,CF800 SERIES,CF800,ECOFOAM™ CF800,CF815HA01050200,ECOFOAM™,ECOFOAM™ 800-SERIES

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【选型】Laird（莱尔德）导电泡棉选型指南

目录- 导电泡棉介绍 Ecofoam™产品系列构造及选型导电泡棉特性导电泡棉选择与注意事项

型号- CF500,CF600,CF700,CF800,CF100

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【产品】Laird推出的高性能材料Ecofoam™CF500H导电泡棉，具有优异的耐湿性

Laird高性能材料的Ecofoam™CF500H通过提供X，Y和Z轴导电性来满足当今计算机、电信和其他电子设备不断提高的微处理器速度，为传统的屏蔽和接地提供了一种创新的方法。

2020-11-25 - 新产品代理服务技术支持批量订货

CF100/CF100B系列EcoFoam™导电泡棉

描述- Laird的EcoFoam™ CF100系列导电泡沫提供了一种创新的屏蔽和接地解决方案，具有X、Y和Z轴导电机能，适用于满足现代计算机、电信和其他电子设备对屏蔽效果的需求。该产品可定制，适用于形状不规则且难以用典型剖面垫圈进行屏蔽的应用。它专为低循环应用设计，如输入/输出（I/O）屏蔽和其他非剪切标准连接器。

型号- ECOFOAM™ CF100,CF125,CF115,CF115HA01050200,ECOFOAM™,CF120B,CF130B,CF100B,CF110B,CF115B,CF125B,CF100 SERIES,CF100B SERIES,CF130,CF120,CF110,CF100

0122 - LAIRD - 数据手册代理服务技术支持批量订货