A steady-state thermal model estimates temperature rise from dissipated power and thermal resistance. Use the model with the correct temperature references and conditions.
How it works in practice
Multiple thermal paths and interfaces may contribute. Transient pulses require a different time-dependent analysis. The component's maximum rated element temperature is not necessarily the permitted case temperature. Validate calculations against actual temperatures under representative operation.
Example and interpretation
With a simplified 5 °C/W path and 4 W dissipation, predicted rise is 20 °C above the chosen thermal reference.
Checks before use
- Identify the thermal path
- Use applicable resistance data
- Calculate steady-state rise
- Verify operation experimentally
Important limit
Do not use a single steady-state number to predict very short pulse temperatures.
Related Centron RF product
50-ohm 10 W thick-film RF resistor. The linked resistor is listed as 50 ohms, 10 W and 4 GHz. Request the recommended mounting, heatsink, derating, tolerance and pulse conditions; those determine whether it is suitable for the intended circuit.
Further reading
Vishay: Resistor Technical FAQ. This background reference explains general principles; the selected Centron RF model’s datasheet governs its own ratings.
Related guides
Educational guide. Numerical examples use the stated assumptions and are not test results for a supplied unit.