1. What is the Thermal Rise Equation?

The thermal rise equation (ΔT = P × θ) calculates the temperature increase in a PCB or electronic component based on power dissipation and thermal resistance. This is crucial for thermal management in electronic design.

2. How Does the Calculator Work?

The calculator uses the thermal rise equation:

Where:

• \( \Delta T \) — Temperature rise in degrees Celsius (°C)
• \( P \) — Power dissipation in watts (W)
• \( \theta \) — Thermal resistance in degrees Celsius per watt (°C/W)

Explanation: The equation shows the direct proportionality between power dissipation and temperature rise, with thermal resistance as the proportionality constant.

3. Importance of Thermal Calculations

Details: Proper thermal calculations prevent overheating, ensure component reliability, and help design appropriate cooling solutions for electronic systems.

4. Using the Calculator

Tips: Enter power dissipation in watts and thermal resistance in °C/W. Both values must be positive numbers for valid calculations.

5. Frequently Asked Questions (FAQ)

Q1: What is typical thermal resistance for PCBs?
A: Typical values range from 20-50°C/W for standard FR4 PCBs, but can vary based on copper weight and board design.

Q2: How does this relate to junction temperature?
A: Junction temperature = Ambient temperature + ΔT. This calculator gives you the ΔT component of that equation.

Q3: When should I be concerned about thermal rise?
A: When ΔT brings component temperatures close to their maximum rated temperatures, or when it causes reliability or performance issues.

Q4: Are there limitations to this equation?
A: This is a simplified model that assumes steady-state conditions and doesn't account for thermal gradients or transient effects.

Q5: How can I reduce thermal rise?
A: Either reduce power dissipation (P) or improve thermal resistance (θ) through better heatsinking, thermal vias, or increased copper area.