NewLinuxFan
Well-known member
I was wondering if these calcs are accurate:
3.3V * 100mA (@600Mhz) = 0.33 Watts of heat
Junction-to-Ambient, no heat sink, natural convection: 40.8 C/W
0.33 W * 40.8 C/W = 13.5 C temperature difference
max junction: 95C
95C - 13.5C = 81.5C = 178.7F without heat sink, natural convection
But junction-to-case is listed at 16.8 C/W, meaning case to air is around 24 C/W which seems a bit too optimistic because that's in the range of an actual heat sink. Maybe the copper traces on the bottom dissipate heat as well as pins.
But I also saw somebody measure 83mA in another thread, so that would improve heat tolerance.
3.3V * 100mA (@600Mhz) = 0.33 Watts of heat
Junction-to-Ambient, no heat sink, natural convection: 40.8 C/W
0.33 W * 40.8 C/W = 13.5 C temperature difference
max junction: 95C
95C - 13.5C = 81.5C = 178.7F without heat sink, natural convection
But junction-to-case is listed at 16.8 C/W, meaning case to air is around 24 C/W which seems a bit too optimistic because that's in the range of an actual heat sink. Maybe the copper traces on the bottom dissipate heat as well as pins.
But I also saw somebody measure 83mA in another thread, so that would improve heat tolerance.