📐 IPC Compliant PCB Designer
Trace width · Conductor spacing · Hole & Pad size — per IPC-2221 / IPC-7251
Engineering tool for reliable PCB layout
📊 Trace Current Capacity
⚡ Conductor Spacing
🔩 Hole & Pad (IPC-7251)
🔌 Target Current (A)
⚙️ Copper Thickness
0.5 oz (0.018 mm)
1 oz (0.035 mm)
2 oz (0.07 mm)
3 oz (0.105 mm)
4 oz (0.14 mm)
Standard copper weight
Custom copper thickness (mm) – overrides oz
🌡️ Temperature Rise (ΔT)
10 °C (Conservative)
20 °C
30 °C
40 °C
🖥️ Layer
External
Internal
📐 Formula: IPC-2221 (k·ΔT^0.44·A^0.725). External layers dissipate better, allowing ~2x current vs internal.
⚡ Voltage
Peak (V)
RMS (V)
🌍 Pollution Degree (IPC-2221)
Pollution Degree 1 (Clean, sealed)
Pollution Degree 2 (Normal, non-conductive)
Pollution Degree 3 (Conductive, high humidity)
🧪 Material Group (CTI)
Group I (CTI ≥ 600)
Group II (400 ≤ CTI < 600)
Group III (175 ≤ CTI < 400)
🖥️ Layer / Location
External (Conductive surface)
Internal / Coated
📐 Based on IPC-2221 Table 6-1 (uncoated). Internal layers or higher pollution require larger spacing.
🔩 Component Lead Diameter (mm)
🔄 Lead Shape
Round
Rectangular (e.g., flat pins)
📐 Based on IPC-7251 (Level A – most conservative). Min hole = lead dia + clearance; nominal hole adds allowance; pad diameter = hole + annular ring.
🔧 Calculate & Apply
📖
References:
IPC-2221 (Generic Standard on Printed Board Design), IPC-2152 (for current), IPC-7251 (Land Patterns). This tool provides quick estimation – consult full standards for safety‑critical designs.
📧 If you have any questions about PCBs, please email us at
sales@pcbsky.com
, and we will answer them for free.