【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
在一些环境恶劣的地方,工程师通常会选用一些抗硫化的元器件来增家产品的可靠性,抗硫化电阻就是一种很常见的元器件,不知道有没有工程师注意到,在电阻,电容,电感三大被动器件中,我们基本只看到电流有抗硫化要求,而没有见到电容和电感有这方面要求,这是什么原因呢?今天我们就来讲讲为什么只有电阻有抗硫化产品。
其实这主要是和电阻的结构有关,电阻其结构值在陶瓷基本上涂(镀)一层很薄的金属层,上面再覆盖一层玻璃涂层和树脂涂层做保护层,但玻璃涂层和树脂涂层都非常薄,在环境比较恶劣的情况下,空气的硫磺成分会沿着电阻保护层和电镀成的缝隙渗进去,与电阻电极银线产生化学反应(具体如下图所示),当化学反应产生硫化银达到一定时,电阻阻值就会变大,甚至产品开路的现象。
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。
我们再来看看陶瓷电容产品的结构,电容是由印好电极(内电极)的陶瓷介质膜片以错位的方式叠合起来,经过一次性高温烧结形成陶瓷芯片,再在芯片的两端封上金属层(外电极),也就是说,电容的内部电极是藏在陶瓷里面的,而且有被两端的金属层包裹在中间,所以空气中的硫磺成分是无法与电容内部电极发生氧化反应的,故一般也不需要做抗硫化处理。
最后在来看看电感,叠层电感电感结构类似陶瓷电容,它的内部电极也是藏在陶瓷/铁氧体中,所以一般也不需要做抗硫化处理。
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,具体如下图所示。
光颉是一家薄膜电阻、厚膜电阻、积层电容及电感的专业制造服务商,拥有超过20年的薄膜精密电阻,电流检测电阻,陶瓷芯片电感, 功率电感, MELF薄膜电阻制造经验。其产品在汽车电子,航天航空,工业电子,医疗设备,EMS,OEM,测量设备,新能源,电源管理,车灯,日常保健用品,多媒体,车锁,电子式启动器,电源管理系统,胎压系统,发动机控制等产品中都得到广泛的应用。
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提供光颉科技车用电阻,薄膜电阻,晶圆电阻,低阻,合金低阻电阻,厚膜电阻,厚膜排阻,引脚电阻,功率电阻,功能性电阻产品选型,符合AEC-Q200标准,在各种封装尺寸中制造公差范围0%~10%,TCR低至2PPM/℃,最高TCR高达600PPM/℃
产品型号
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品类
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Type
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TCR(PPM/℃)
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Size
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Resistance Tolerance(%)
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Resistance(mΩ、Ω、KΩ、MΩ)
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Seires
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AR02ATB0510
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Thin Film Precision Chip Resistor
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AR02
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±10PPM/℃
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0402
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±0.05%
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51Ω
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AR Series
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选型表 - 光颉科技 立即选型
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价格:¥0.0320
现货: 9,700
品牌:光颉科技
品类:Automotive Grade Anti-Sulfurated Chip Resistor
价格:¥0.0139
现货: 9,700
现货市场
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配备KEYSIGHT网络分析仪,可测量无线充电系统发射机/接收机线圈的阻抗,电感L、电阻R、电感C以及品质因数Q,仿真不同充电负载阻抗下的无线充电传输效率。支持到场/视频直播测试,资深专家全程指导。
实验室地址: 深圳 提交需求>
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%。
最小起订量: 100个 提交需求>
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