Hi Yaita-san, Apologies for responding late. With the new information, we can do the following calaculations: 1. The total power dissipation for a resistive load will be at mid-code i.e. (5.5V*6mA) + 3*8*(2.5V/350) = 0.033W + 0.171W = 0.2W 2. With Rth-ja of 68 oC/W and TA of 95 oC, the Tj will be (0.2W*68) + 95 = 108.6 oC This junction temperature should be fine to operate at. If you are interested in calaculating the actual MTTF and FIT values with a given junction temperature, you can use the derating tool available on the following page: www.ti.com/.../estimator.tsp Hope that answers your question. Regards, Uttam
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