Aug 15, 2014 #1 B btbass Advanced Member level 5 Joined Jul 20, 2001 Messages 1,896 Helped 438 Reputation 880 Reaction score 288 Trophy points 1,363 Location Oberon Activity points 12,887 With a FR4 PCB 1.6mm thick 4 layer, 25mm by 50mm how much wattage could we dump into the PCB to get ≤50°C rise?
With a FR4 PCB 1.6mm thick 4 layer, 25mm by 50mm how much wattage could we dump into the PCB to get ≤50°C rise?
Aug 15, 2014 #2 D.A.(Tony)Stewart Advanced Member level 7 Joined Sep 26, 2007 Messages 9,014 Helped 1,824 Reputation 3,647 Reaction score 2,202 Trophy points 1,413 Location Richmond Hill, ON, Canada Activity points 59,605 It depends on convection resistance, orientation,solder mask coating air flow velocity copper thickness, Case Rjc I would guestimate 5W~10W. More important is the Tj, not Tcu to not exceed 50 deg C rise for reliability.
It depends on convection resistance, orientation,solder mask coating air flow velocity copper thickness, Case Rjc I would guestimate 5W~10W. More important is the Tj, not Tcu to not exceed 50 deg C rise for reliability.