Knowledge What do Ta, Tj, and Tc temperatures mean?

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Knowledge What do Ta, Tj, and Tc temperatures mean?

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Ambient temperature (Ta): The temperature of the air immediately surrounding the LED. In general, this temperature should be measured outside the full-width half-maximum (FWHM) beam angle of the LED and within the enclosure that contains the LED.

Junction temperature (Tj): The temperature of the junction of the LED die inside the semiconductor package. Direct measurement of Tj is impractical but can be calculated based on a known case or board temperature and the materials' thermal resistance.

Case temperature (Tc or Ts): This is the temperature of the case of the semiconductor device. Ts is defined by IES as the temperature of the thermocouple attachment on the LED package.

Solder point temperature (Tsp): The temperature of the thermal pad on the bottom of the LED lighting system. Tsp is also called case temperature (Tc).
 
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