SMJE-XV12W2P4 Datasheet, PDF (5/24 Pages) Seoul Semiconductor – Integrated AC LED Solution

Thermal Resistance
Product Data Sheet
Acrich2 – 12.7W
Part
Acrich2 LED
Acrich2 IC
Package
Power Dissipation [W]
SAW8WA2A Max 1.55
Max 1.0
Maximum
Junction Temperature [℃]
125
150
Rθ_j-s [℃/W]
23
11.25
The Acrich2 LED has a thermal resistance of 23℃/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} - (Rθ_j-s * P_d)
= 125℃ - (23℃/W * 1.55W) = 89.35℃
Although this is the maximum lead temperature, it is recommended to keep the lead temperature
under 70℃.
The Acrich2 IC has a 11.25℃/W thermal resistance from junction to the top surface.
The maximum junction temperature (T_{j_max}) of the IC is 150℃, therefore the maximum
temperature of the top of the IC is
T_{t_max} = T_{j_max} – (Rθ_j-t * P_d)
= 150℃ - (11.25℃/W * 1.0W) = 138.75℃
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