LDO Thermal & Junction Temperature Calculator

This calculator helps you determine if your LDO circuit and package can safely dissipate heat and if it exceeds safe operating limits.

Use this tool to:

  1. Calculate real-time power dissipation and temperature rise.
  2. Select the correct package (e.g., SOT-23 vs. TO-220) for your thermal load.
  3. Identify when a high-efficiency buck converter is necessary to prevent overheating.
Input Parameters
Results
Thermal Warning: Junction temperature exceeds 125°C. Cooling or a Buck Converter is required.

*Calculation assumes 25°C ambient and standard 1oz copper PCB layout.

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