Firstohm提供无银的MELF电阻器,已通过ANSI-EIA-977测试,有效防止硫化故障
贴片电阻已成为当今电子电路中最常见的元件之一。但是,贴片电阻的电极结构中含有银(Ag)。当空气中有大量硫时,银倾向于与之反应并变成硫化银(Ag2S或Ag2SO4),银便失去了导电性,电阻值逐渐增大,最终变为开路。以下是贴片电阻的内部结构图:
贴片电阻硫化与故障的解决方案:用保形涂层技术在PCB上均匀地涂覆保形涂层,这可以形成一层有效的保护膜,阻隔空气并防止硫化,但该过程增加了制造时间和成本,并阻碍了PCB散热。
抗硫化的最佳选择:
FIRSTOHM可提供MELF电阻器——该类产品在生产过程和原材料中没有银(Ag)含量,因此发生硫化的可能性小。除化工、采矿、火力发电、汽车电子等含硫环境以外,该电阻器还可用于对可靠性要求较高的高端应用,如电信。
实验:
标准:根据国际无源元件硫化验证标准:ANSI-EIA-977进行测试。
测试条件:将样本放在暴露于试验环境的容器中(见下图),温度为105℃,持续750小时。
测试结果:通过
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目录- 公司简介 GDT陶瓷气体放电管 TVS瞬态抑制二极管 ESD静电保护元件 TSS半导体放电管 MLV贴片压敏电阻 高分子ESD MOV压敏电阻 SPG强效放电管 PPTC自恢复保险丝 贴片磁珠 贴片电感
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