Pcb Engineering

SMT Pad Planar Conduction Thermal Resistance Calculator

SMT Pad Planar Conduction Thermal Resistance Calculator engineering calculator.

Quick Answer

Calculate SMT Pad Planar Conduction Thermal Resistance Calculator

Calculator

Thermal Resistance (K⁄W)
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Result Interpretation

SMT Pad Planar Conduction Thermal Resistance Calculator computes Thermal Resistance in K/W using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Pad Width = 0.0015
  • Pad Length = 0.002
  • Copper Trace Thickness = 3.5E-5
  • Copper Thermal Conductivity = 390
  • PCB Substrate Thickness = 0.0016
  • Substrate Thermal Conductivity = 0.3

Expected Result:

  • Thermal Resistance = 2280.8302808303

Engineering Interpretation:

Under the given input conditions, the calculated result is: Thermal Resistance = 2280.8302808303 K/W.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

thermal resistance = (pcb substrate thickness / (copper thermal conductivity * pad length * copper trace thickness)) + (pcb substrate thickness / (substrate thermal conductivity * pad width * pcb substrate thickness))

Formula family: formula_pcb_smt_pad_thermal_resistance_calculator

Variables

SymbolLabelRoleDescription
pad_length Pad Length INPUT Pad Length
pad_width Pad Width INPUT Pad Width
copper_thickness Copper Trace Thickness INPUT Copper Trace Thickness
substrate_thickness PCB Substrate Thickness INPUT PCB Substrate Thickness
copper_conductivity Copper Thermal Conductivity INPUT Copper Thermal Conductivity
substrate_conductivity Substrate Thermal Conductivity INPUT Substrate Thermal Conductivity
thermal_resistance Thermal Resistance OUTPUT Thermal Resistance

Calculation Steps

  1. Enter the pad length in m.
  2. Enter the pad width in m.
  3. Enter the copper trace thickness in m.
  4. Enter the pcb substrate thickness in m.
  5. Enter the copper thermal conductivity in W/(m*K).
  6. Enter the substrate thermal conductivity in W/(m*K).
  7. Step 1: Compute thermal resistance.
  8. Read the thermal resistance (K/W) from the results.

Engineering Summary

Calculate SMT Pad Planar Conduction Thermal Resistance Calculator

Frequently Asked Questions

What does this calculator calculate?

The SMT Pad Planar Conduction Thermal Resistance Calculator estimates Thermal Resistance based on the input parameters you provide

Why is pad length important in this calculation?

pad length is directly proportional to thermal resistance. When you enter pad length in m, the calculator uses it in the engineering formula to compute the output

How should I interpret the result thermal resistance?

The calculator outputs thermal resistance in K/W. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Pad Length (m), Pad Width (m), Copper Trace Thickness (m), PCB Substrate Thickness (m), Copper Thermal Conductivity (W/(m*K)), Substrate Thermal Conductivity (W/(m*K)). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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