⏱️ Transmission Line Time Delay Calculator
Compute propagation delay for PCB traces (Microstrip / Stripline)
Based on dielectric constant & trace geometry
📏 Trace Length
millimeters (mm)
centimeters (cm)
inches (in)
Enter the physical length of the signal trace.
📐 Transmission Line Type
Microstrip (outer layer)
Stripline (inner layer)
📐 Microstrip Geometry (W/H)
Width of the trace (mm)
Dielectric thickness (prepreg/core)
Used to calculate effective permittivity (ε_eff) for microstrip.
🧪 Dielectric Material
FR-4 (Standard) (εr = 4.5)
FR-4 High TG (εr = 4.8)
Rogers RO4003C (εr = 3.38)
Rogers RO4350B (εr = 3.48)
Polyimide (εr = 3.5)
Teflon (PTFE) (εr = 2.1)
Alumina (ceramic) (εr = 9.8)
Custom (user defined)
Enter dielectric constant (e.g., 3.5, 4.2, 10.0)
⚡ Calculate Time Delay
📖
Formulas:
v = c / √ε
eff
, delay = length / v. For microstrip, ε
eff
= (εr+1)/2 + (εr-1)/2 × 1/√(1+12H/W). For stripline, ε
eff
= εr. Typical FR-4 microstrip delay ~ 5.4 ps/mm (137 ps/inch).
📧 If you have any questions about PCBs, please email us at
sales@pcbsky.com
, and we will answer them for free.