IPC-2222 Thermal Relief in Conductor Planes

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Presentation transcript:

IPC-2222 9.1.2 Thermal Relief in Conductor Planes The relationship between the hole size, land and web area is critical. Typically, divide 60% of the minimum land area diameter by the number of webs desired to obtain the width of each web in accordance with the following example:

IPC-2222 9.1.2 Thermal Relief in Conductor Planes A. Land Size Calculation Maximum hole size = 1.0 mm Annular ring = 2 x 0.05 mm = 0.10 mm Fabrication allowance = 0.25 mm Minimum land size = 1.0 mm + 0.10 mm + 0.25 mm = 1.35 mm diameter

IPC-2222 9.1.2 Thermal Relief in Conductor Planes B. Thermal Relief Calculation Total thermal width = 60% of land size = 0.6 x 1.35 mm = 0.80 mm

IPC-2222 9.1.2 Thermal Relief in Conductor Planes C. Original Web Size Calculation 2-web width = 1/2 of total thermal width = 0.50 x 0.80 mm = 0.40 mm 3-web width = 1/3 of total thermal width = 0.33 x 0.80 mm = 0.27 mm

IPC-2222 9.1.2 Thermal Relief in Conductor Planes 4-web width = 1/4 of total thermal width = 0.25 x 0.80 mm = 0.20 mm If the actual land diameter chosen is greater than the minimum value calculated, the percentage difference between the land diameters must be subtracted from the total web width calculation, i.e.:

IPC-2222 9.1.2 Thermal Relief in Conductor Planes Minimum land diameter = 1.35 mm Actual land diameter = 1.70 mm Percent difference = (1.70 - 1.35 mm)/1.35 mm = 25% New total web width = total web width percent difference = 0.80 mm - 25% (0.80 mm) = 0.60 mm

IPC-2222 9.1.2 Thermal Relief in Conductor Planes D. Adjusted Web Size Calculation 2-web width = 1/2 of new total web width = 0.50 x 0.60 mm = 0.30 mm 3-web width = 1/3 of new total web width = 0.33 x 0.60 mm = 0.20 mm

IPC-2222 9.1.2 Thermal Relief in Conductor Planes 4-web width = 1/4 of new total web width = 0.25 x 0.60 mm = 0.15 mm Total cumulative copper web for all layers in any plated-through hole should not exceed 4.0 mm for 1 oz copper or 2.0 mm for 2 oz copper.

IPC-2222 9.1.2 Thermal Relief in Conductor Planes The total of the thermal relief cross- sectional area divided by the number of planes connected to the plated-through hole shall not violate current carrying capacity requirements for a given hole. If the individual web width violates the intended minimum conductor width it shall be specified on the master drawing.