【技术】一文告诉你电阻如何实现抗硫化功能
现代汽车工业以及空气污染较严重的地区其设备上的电阻很容易受到硫化攻击而发生故障,一般贴片电阻的电极是以银为导体,很容易与硫产生反应导致电阻失效。本文将以光颉科技(VIKING)的抗硫化电阻为例,说明如何让电阻实现抗硫化。
如图一所示,是贴片电阻的结构的示意图,从图中可以看出硫很容易从电镀锡层、电镀镍层与G2保护层的缝隙进入,与电极银发生化学反应产生Ag2S,其反应原理:2Ag+S2﹣→Ag2S﹢2e﹣,而Ag2S是不导电物质,最终会导致电阻的阻值变化甚至失效。
图1 贴片电阻的结构的示意图
光颉科技针对这一隐患,设计出了抗硫化电阻,其抗硫化的原理主要从材料和结构上解决,首先,材料方面,光颉科技采用抗硫化的电极材料,从源头上大大降低电极被硫化的几率;其次,结构方面,采用特殊的抗硫化结构,如图2所示,增加含硫气体进入电阻内部的距离,同时增加电极与电阻层的有效接触面积,可以有效降低电阻受硫化的影响。
图2 光颉科技抗硫化电阻的内部结构示意图
光颉科技抗硫化电阻均经过严格抗硫化测试,其测试标准按照ASTM B 809和EIA-977 A/B测试通过,如图3所示,就是抗硫化测试的相关要求,尤其是EIA-977 B测试条件最为严格,105±2℃条件下工作750小时。光颉科技的AS.A系列抗硫化电阻就是通过了EIA-977 B的测试,目前广泛应用于汽车和环境检测行业。
图3 抗硫化测试标准示意图
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【经验】一文告诉你为什么阻容感中通常只有电阻有抗硫化产品
抗硫化电阻一般是通过延长二次保护包裹层设计尺寸,同时让底层电极覆盖二次保护,大到一定尺寸,电镀时镍层与锡层均容易覆盖二次保护层,避免二次保护层边缘暴露在空气中与硫化气体化合反应,提高电阻抗硫化能力。世强目前供应的抗硫化电阻主要有VIKING 的AS.A系列,尺寸从0201~2512都有包含,精度最小也可以做到0.5%,基本可以满足各个行业急需。
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【选型】光模块中抗硫化电阻的选型推荐:AS.A系列
近几年随着数据中心、5G网络等建设加速,100G以上的光模块需求量迅猛增长,这些光模块的特点是PCB上器件密集,热量高,对器件的体积性能有非常大的要求。同时,在一些西北,华中等地区,空气中含硫量比较高,模块运行一段时间后,会因电阻硫化失效导致光模块失效,以至于信号中断。因此,在这些光模块上的电阻选择非常需要引起重视,不但需要小封装如0201,还需要有抗硫化能力。这里给大家推荐光颉的AS.A系列。
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【视频】双重保护的抗硫化电阻在光模块产品的应用
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【选型】抗硫化电阻CS02FTFWR050用于400G相干模块电流检测,阻值仅50毫欧,0402小封装
在400G相干模块产品中,客户对电阻的要求是抗硫化,50毫欧,封装0402,精度1%,温漂没有要求,保持一致性。基于几点要求,笔者给客户推荐光颉科技旗下型号为CS02FTFWR050的抗硫化电阻。该电阻封装0402、精度1% 、阻值是50毫欧,温漂为200PPM。
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AR02
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1.1nH
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可定制分流器电阻范围20uΩ~100uΩ,可自由设计铜排形状尺寸,电镀:镀锡/镀镍。支持RoHS指令 、AEC-Q200。认证资格:IATF16949;ISO9001;检测精度:0.1%。
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