SMJE-2V04W1P3 Datasheet, PDF (7/17 Pages) Seoul Semiconductor – The Acrich 2 series, which are designed for AC drive(or operation), do not need the standard converter essential for a conventional general lighting product.

2. Thermal Resistance
The Acrich2 LED has a thermal resistance of 27degC/W from junction to the LED lead.
The maximum junction temperature of Acrich2 LED package is 125degC, therefore the maximum
lead temperature T_{s_max} is
T_{s_max} = T_{j_max} - (Rθ_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 70degC
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 125degC, therefore the maximum
temperature of the top of the IC is
T_{t_max} = T_{j_max} - (ψ_j-t * P_D)
℃ ℃ ℃ = 125 - (16.4 /W * 1.0W) = 108.6
Rev. 01
June 2012
7
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