1. What is Heat Sink Thermal Resistance?

Definition: Thermal resistance (θ) measures how effectively a heat sink transfers heat from a component to the surrounding environment.

Purpose: It helps engineers select appropriate heat sinks for electronic components to prevent overheating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( θ \) — Thermal resistance (K/W)
• \( ΔT \) — Temperature difference between component and ambient (K)
• \( Q \) — Heat flow or power dissipation (W)

Explanation: The temperature difference is divided by the heat flow to determine how much thermal resistance the heat sink presents.

3. Importance of Thermal Resistance Calculation

Details: Proper thermal resistance calculation ensures electronic components operate within safe temperature ranges, improving reliability and lifespan.

4. Using the Calculator

Tips: Enter the temperature difference (ΔT) in Kelvin and heat flow (Q) in Watts. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a good thermal resistance value?
A: Lower values are better. Typical values range from 0.5-10 K/W depending on heat sink size and design.

Q2: How do I measure ΔT?
A: Subtract ambient temperature from component temperature (both in Kelvin).

Q3: What affects thermal resistance?
A: Material, surface area, airflow, and contact quality between component and heat sink.

Q4: What if my heat flow is in mW?
A: Convert to Watts (1 W = 1000 mW) before calculation.

Q5: How does this relate to junction temperature?
A: Junction temp = ambient temp + (θ × power dissipation).