Current → Trace Width (IPC-2221)
Required Width
—
IPC-2221: I = k × (ΔT^0.44) × (A^0.725)
k = 0.048 (external) / 0.024 (internal)
k = 0.048 (external) / 0.024 (internal)
Trace Width → Current (IPC-2221)
mm
Max Current
—
IPC-2221: I = k × (ΔT^0.44) × (A^0.725)
k = 0.048 (external) / 0.024 (internal)
k = 0.048 (external) / 0.024 (internal)
Current → Trace Width (IPC-2152)
Base Width (unadjusted)
—
Adjusted Width
—
Modifiers
—
IPC-2152: Ac = (117.555 × ΔT−0.913 + 1.15) × I(0.84
× ΔT−0.108 + 1.159)
Adjusted for board thickness, plane proximity, and layer position
Adjusted for board thickness, plane proximity, and layer position
Trace Width → Current (IPC-2152)
mm
Base Max Current (unadjusted)
—
Adjusted Max Current
—
Modifiers
—
IPC-2152: Ac = (117.555 × ΔT−0.913 + 1.15) × I(0.84
× ΔT−0.108 + 1.159)
Adjusted for board thickness, plane proximity, and layer position
Adjusted for board thickness, plane proximity, and layer position
Modifier values are approximations derived from IPC-2152 charts. For safety-critical
designs, consult the full standard.
Microstrip Impedance (Zo)
mm
mm
Characteristic Impedance
—
Effective Dielectric Constant
—
Microstrip Formula: Zo ≈ (87/√(εr+1.41)) × ln(5.98H/(0.8W+T))
Where: W = trace width, H = dielectric thickness, T = copper thickness, εr = relative permittivity
Note: This is an approximation. For precise designs, use field solver tools.
Where: W = trace width, H = dielectric thickness, T = copper thickness, εr = relative permittivity
Note: This is an approximation. For precise designs, use field solver tools.
Quick Reference: Standard Trace Widths
| Width (mm) | Width (mil) | 1 oz @ 20°C Ext | 1 oz @ 20°C Int | 2 oz @ 20°C Ext | 2 oz @ 20°C Int |
|---|