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🔌 PCB 走线宽度（IPC-2221）PCB Trace Width Calculator (IPC-2221)
IPC-2221：I = k × ΔT^0.44 × A^0.725（A 为截面积 mil²，外层 k = 0.048，内层 k = 0.024），由电流、允许温升和铜厚求最小线宽。本地处理。IPC-2221: I = k × ΔT^0.44 × A^0.725 (A cross-section in mil², k = 0.048 external, 0.024 internal) gives the minimum width from current, allowed temperature rise and copper weight. Processed locally.
使用说明与常见问题How-to & FAQ
「PCB 走线宽度（IPC-2221）」是什么？What is the PCB Trace Width Calculator (IPC-2221) tool?
IPC-2221：I = k × ΔT^0.44 × A^0.725（A 为截面积 mil²，外层 k = 0.048，内层 k = 0.024），由电流、允许温升和铜厚求最小线宽。本地处理。IPC-2221: I = k × ΔT^0.44 × A^0.725 (A cross-section in mil², k = 0.048 external, 0.024 internal) gives the minimum width from current, allowed temperature rise and copper weight. Processed locally.
如何使用「PCB 走线宽度（IPC-2221）」？How do I use the PCB Trace Width Calculator (IPC-2221) tool?
在「PCB 走线宽度（IPC-2221）」中，填写「电流 A」、「允许温升 °C」、「铜厚 oz/ft²」、「层」等参数，结果会随输入实时计算并显示在下方。In the PCB Trace Width Calculator (IPC-2221): Fill in "Current A", "Temperature rise °C", "Copper weight oz/ft²", "Layer"; results are recalculated instantly as you type.
1 oz 有多厚？How thick is 1 oz?
1 oz/ft² 铜约 1.378 mil（35 µm）。1 oz/ft² copper is about 1.378 mil (35 µm).
能举个计算实例吗？Can you show a worked example?
例如在「PCB 走线宽度（IPC-2221）」中填 电流 A = 2，允许温升 °C = 10，铜厚 oz/ft² = 1，层 = 外层，结果区显示：最小线宽：30.76 mil；毫米：0.781 mm；截面积：42.39 mil²；提示：IPC-2221 为保守估算For example, entering Current A = 2, Temperature rise °C = 10, Copper weight oz/ft² = 1, Layer = External in the PCB Trace Width Calculator (IPC-2221) gives: Minimum width: 30.76 mil; Millimetres: 0.781 mm; Cross-section: 42.39 mil²; Note: IPC-2221 is a conservative estimate
哪些输入会被检查？Which inputs are validated?
「PCB 走线宽度（IPC-2221）」会检查这些输入——「电流 A」、「铜厚 oz/ft²」：必须填写，须大于 0；「允许温升 °C」：必须填写；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The PCB Trace Width Calculator (IPC-2221) checks its inputs — "Current A", "Copper weight oz/ft²": required, must be greater than 0; "Temperature rise °C": required; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「PCB 走线宽度（IPC-2221）」的设置：「电流 A」默认 2；「允许温升 °C」默认 10；「铜厚 oz/ft²」默认 1；「层」可选 外层、内层（默认 外层）。每次生成结果都按当前设置处理。Settings in the PCB Trace Width Calculator (IPC-2221) — "Current A" default 2; "Temperature rise °C" default 10; "Copper weight oz/ft²" default 1; "Layer": External, Internal (default External). The result always uses the current settings.
计算结果可以用于作业或工程吗？Can I use the results for homework or engineering?
「PCB 走线宽度（IPC-2221）」使用教科书标准公式（公式写在说明和常见问题中），适合学习和估算核对；涉及安全的工程设计请以规范和实测为准。The PCB Trace Width Calculator (IPC-2221) uses standard textbook formulas (given in the description and FAQ), which is good for learning and checking estimates; for safety-critical engineering follow codes and measured values.
「PCB 走线宽度（IPC-2221）」免费吗？需要注册吗？Is the PCB Trace Width Calculator (IPC-2221) free? Do I need an account?
「PCB 走线宽度（IPC-2221）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The PCB Trace Width Calculator (IPC-2221) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.