Electronics Engineering

IC Package Junction-to-Ambient and Junction-to-Case Thermal Resistance Selector calculator

IC Package Junction-to-Ambient and Junction-to-Case Thermal Resistance Selector engineering calculator.

Quick Answer

Calculate IC Package Junction-to-Ambient and Junction-to-Case Thermal Resistance Selector

Calculator

Junction-to-Ambient Thermal Resistance (K⁄W)
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Result Interpretation

IC Package Junction-to-Ambient and Junction-to-Case Thermal Resistance Selector calculator computes Junction-to-Ambient Thermal Resistance in K/W using the defined engineering formula and the input values provided. Junction-to-Ambient Thermal Resistance is expressed in K/W. No universal acceptance threshold is defined by this calculator.

Worked Example

Verified calculation

Given:

  • Junction-to-Case Thermal Resistance = 1.2
  • Case-to-Sink Thermal Resistance = 0.4
  • Thermal Interface Material Resistance = 0.15
  • Heat Sink-to-Ambient Thermal Resistance = 3.5

Expected Result:

  • Junction-to-Ambient Thermal Resistance = 5.25

Engineering Interpretation:

Under the given input conditions, the calculated result is: Junction-to-Ambient Thermal Resistance = 5.25 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

junction-to-ambient thermal resistance = junction-to-case thermal resistance + case-to-sink thermal resistance + thermal interface material resistance + heat sink-to-ambient thermal resistance

Formula family: formula_electronics_ic_package_thermal_resistance_thsubjasubthsubjcsub_selector_tool

Variables

SymbolLabelRoleDescription
theta_JC Junction-to-Case Thermal Resistance INPUT Junction-to-Case Thermal Resistance
theta_CS Case-to-Sink Thermal Resistance INPUT Case-to-Sink Thermal Resistance
theta_INT Thermal Interface Material Resistance INPUT Thermal Interface Material Resistance
theta_SA Heat Sink-to-Ambient Thermal Resistance INPUT Heat Sink-to-Ambient Thermal Resistance
result Junction-to-Ambient Thermal Resistance OUTPUT Junction-to-Ambient Thermal Resistance

Calculation Steps

  1. Enter the junction-to-case thermal resistance in K/W.
  2. Enter the case-to-sink thermal resistance in K/W.
  3. Enter the thermal interface material resistance in K/W.
  4. Enter the heat sink-to-ambient thermal resistance in K/W.
  5. Step 1: Compute junction-to-ambient thermal resistance.
  6. Read the junction-to-ambient thermal resistance (K/W) from the results.

Engineering Summary

Calculate IC Package Junction-to-Ambient and Junction-to-Case Thermal Resistance Selector

Frequently Asked Questions

What does this calculator calculate?

The IC Package Junction-to-Ambient and Junction-to-Case Thermal Resistance Selector calculator estimates Junction-to-Ambient Thermal Resistance based on the input parameters you provide

Why is junction-to-case thermal resistance important in this calculation?

junction-to-case thermal resistance is directly proportional to junction-to-ambient thermal resistance. When you enter junction-to-case thermal resistance in K/W, the calculator uses it in the engineering formula to compute the output

How should I interpret the result junction-to-ambient thermal resistance?

The calculator outputs junction-to-ambient 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: Junction-to-Case Thermal Resistance (K/W), Case-to-Sink Thermal Resistance (K/W), Thermal Interface Material Resistance (K/W), Heat Sink-to-Ambient Thermal Resistance (K/W). 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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