铝电解电容要找第二货源？容量与电压只是规格书的头两行，以下四项也要对齐。
1. 耐久时数：指定温度下的小时数。“105 °C 2000 小时”与“85 °C 2000 小时”是不同的零件；同一温度下的 2000 小时与 5000 小时亦然。这一行决定零件在你的产品内如何老化，请逐行比对。
2. 阻抗等级：标准、低阻抗、超低阻抗系列用的是相同的容量及电压代码。在开关稳压器的输出端，换了等级会改变纹波表现。请核对你设计所用频率下的阻抗或 ESR 数值。
3. 温度范围：下限 −55 °C 与 −40 °C 在 BOM 上看似相近，但其中一个未必覆盖你产品的储存及运输条件。请确认范围的上下两端。
4. 安装与焊接：贴片 V-chip 零件可承受回流焊，插件零件则不可。请确认规格书实际允许的焊盘、高度限制及焊接曲线。
把参考零件的规格书与候选零件的并排，逐行对照。若有一行不符，由负责该设计的工程师决定是否要紧。
Pro-An 是 1992 年起立足香港及深圳的独立分销商。自家被动元件品牌 KOME 的贴片铝电解系列涵盖上述耐久、阻抗及温度等级。我们先提供规格书及样品，只在关键参数与你提供的参考零件相符时才建议料号，由你的工程师决定。ISO 9001:2015 认证（证书编号 11326Q02187R001）。
把参考料号发给我们，或 WhatsApp +852 7052 5263，下单前我们先回复规格书对照。
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英文原文（以原文为准）
Second-sourcing an aluminium electrolytic capacitor? Capacitance and voltage are only the first two lines. Match these four as well.
1. Endurance: hours at temperature. "2000 h at 105 °C" and "2000 h at 85 °C" are different parts, and so are 2000 h and 5000 h at the same temperature. The endurance line decides how the part ages in your product, so compare it line for line.
2. Impedance class. Standard, low-impedance and extra-low-impedance series share the same capacitance and voltage codes. On the output of a switching regulator, a swap between classes changes ripple behaviour. Check the impedance or ESR figure at the frequency your design uses.
3. Temperature range. A lower limit of −55 °C and one of −40 °C look similar on a BOM line, but one of them may not cover your product's storage and transport conditions. Confirm both ends of the range.
4. Mounting and soldering. SMD V-chip parts are rated for reflow; radial parts are not. Confirm the footprint, the height limit and the soldering profile the datasheet actually allows.
Put the reference part's datasheet next to the candidate's and go down these lines one by one. If a line does not match, the engineer who owns the design decides whether it matters.
Pro-An is an independent distributor based in Hong Kong and Shenzhen since 1992. Our own passive brand, KOME, includes SMD aluminium electrolytic series across these endurance, impedance and temperature classes. We send datasheets and samples first, and propose a part only where the key parameters match the reference you give us. Your engineers make the call. ISO 9001:2015 certified (Certificate No. 11326Q02187R001).
Send us your reference part number. We reply with the datasheet comparison before anything is ordered.
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