SMJE-1V08W1P2 Datasheet, PDF (6/15 Pages) Seoul Semiconductor – Acrich2 - 100V 8.7W Bulb Connect using a AIC directly to AC power

2. Thermal Resistance
Part
Acrich2 LED
Acrich2 IC
Package Power
Dissipation [W]
SAW8KG0A Max 0.5
Max 1.5
Maximum Junction
Temp[℃]
125
125
Rθ_j-s
[℃/W]
27
5.5
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} - (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 70degC
The Acrich2 IC has a 5.5degC/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} - (y_j-t * P_D)
= 125℃ - (5.5℃/W * 1.5W) = 116.8℃
Rev. 02
October 2012
6
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