SMJE-3V08W1P3_13 Datasheet, PDF (8/21 Pages) Seoul Semiconductor – Acrich2 - 220V 8.7W Bulb Connects directly to AC line voltage

2. Thermal Resistance
RoHS
Part
Acrich2 LED
Acrich2 IC
Package Power
Dissipation [W]
SAW8KG0B Max 0.5
Max 1.0
Maximum Junction
Temp[℃]
125
125
Rθ_j-s
[℃/W]
27
16.4
The Acrich2 LED has a thermal resistance of 27℃/W from junction of the LED to the LED lead.
The maximum junction temperature of the Acrich2 LED package is 125℃, therefore the maximum
lead temperature T_{s_max} is
T_{s_max} = T_{j_max} - (Rq_j-s * P_D)
= 125℃ - (27℃/W * 0.5W) = 111.5℃
Although this is the maximum lead temperature, it is recommended to keep the lead temperature
under 70℃
The Acrich2 IC has a 16.4degC/W thermal resistance from junction to the top surface.
The maximum junction temperature (T_{t_max}) of the IC is 125℃, therefore the maximum
temperature of the top of the IC is
T_{t_max} = T_{j_max} - (y_j-t * P_D)
= 125℃ - (16.4℃/W * 1.0W) = 108.6℃
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