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Is is possible to tell me the current capacity of a 50th inch diameter via.

If i look at your specifications, the via plating thickness is 0.03mm. to calculate the cross section area of the coopper, for a 50th inch hole the inside diameter of the via is 1.27mm and the outside is 1.33mm. This calcualtes to 0.156 mm squared. There are 1550 mils squared i think in 1 mm square so this translates to 189 mil square. Using an equation previously proposed where I = 0.048 A T where T is temp rise in deg C and A is area in mil square, this turns out to be 122 Amps for 10 deg C. This is clearly not correct. Could you please advise the correct equation to calculate the current for differnt vias.

Regards
Lachlan

: Is is possible to tell me the current capacity of a 50th inch diameter via.
:
: If i look at your specifications, the via plating thickness is 0.03mm. to calculate the cross section area of the coopper, for a 50th inch hole the inside diameter of the via is 1.27mm and the outside is 1.33mm. This calcualtes to 0.156 mm squared. There are 1550 mils squared i think in 1 mm square so this translates to 189 mil square. Using an equation previously proposed where I = 0.048 A T where T is temp rise in deg C and A is area in mil square, this turns out to be 122 Amps for 10 deg C. This is clearly not correct. Could you please advise the correct equation to calculate the current for differnt vias.
:
: Regards
: Lachlan

Hi Lachlan
a hole with 1.27 mm is like a track with 4 mm ( 2 x Radius x Pi =
circumfence ) .And the track will be 10 °C higher than room temperature if
the current is 6 Amp.For 20 °C the current is 8.5 Amp.

I hope this answers your question.

Best Regards
Your Pcb-Pool Team