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TABLE 16.4 Minimum Internal Copper Foil Thickness3 Internal conductor thickness after processing Minimum thickness Copper foil 1/8 oz. 1/4 oz. 3/8 oz. 1/2 oz. 1 oz. 2 oz. 3 oz. 4 oz. ( m) 3.5 6 8 12 25 56 91 122 (in.) 0.000138 0.000236 0.000315 0.000472 0.000984 0.002205 0.003583 0.004803

TABLE 16.5 Minimum External Conductor Thickness4 External conductor thickness after plating Minimum Base copper foil 1/8 oz. 1/4 oz. 3/8 oz. 1/2 oz. 1 oz. 2 oz. 3 oz. 4 oz. ( m) 20 20 25 33 46 76 107 137 (in.) 0.000787 0.000787 0.000984 0.001299 0.001811 0.002992 0.004213 0.005394

allowed to be a minimum of 0.00098 in. thick rather than 0.0014 in. This significant difference can cause a 50 percent difference in trace temperature rise. Fortunately, copper thickness tends to run more toward a nominal, although attention should be given to the fact that minimum thicknesses do exist and have the potential of being a problem if the limits are being pushed on temperature rise and current level. External conductors have a thicker minimum (see Table 16.5) due to plating during the final processing steps at the manufacturer. It is always recommended to discuss the details of the board with the circuit board manufacturer. The board manufacturer will know what the typical thickness of the final product will be, which will vary from one board design to another.The final thickness can also be defined on drawings that are sent to the manufacturer.

1. Hoynes, D. S., Characterization of Metal-Insulator Laminates, by Progress Report to Navy Bureau of Ships, National Bureau of Standards Report 4283, January 1955 December 1955. (The National Bureau of Standards is now the National Institute of Standards and Technology [NIST].) 2. Ibid., May 1, 1956, p. 25. 3. IPC-2221, Internal Layer Foil Thickness after Processing, Copper Foil Minimum, Table 10-1. 4. Ibid., Table 10-2.

of Cu can dissolve from the knee of the PTH Nickel barrier plating minimizes this effect because Ni dissolves far more slowly in eutectic Sn-Pb solder than Cu does Use of Au plating can embrittle the eutectic Sn-Pb solder most commonly used in electronic assembly Gold plating of various thicknesses is used for a variety of reasons, including as a solderability preservative over nickel plating, for connector contacts, and to provide wirebondable pads Reliability problems can arise because Au has a high solubility in eutectic SnPb solders at reflow temperatures and dissolves extremely rapidly In most cases, the Au finish on a PCB or component termination will be completely dissolved into the solder In a wavesoldering process, the Au will be washed into the bath, requiring monitoring and bath changes to maintain the Au concentration at a low level that does not affect the process.

Repeat the question so that the entire audience can hear. If there is any doubt that everyone can hear the question being asked, be sure to repeat it. When everyone can hear the questioner, repeat only those questions that need to be simpli ed. Answer each part of compound questions separately. If questions are layered one upon another, respond to each question separately.

However, in a reflow process, this Au remains in the finished solder joint To avoid embrittlement of the solder by the AuSn4 and AuSn2 intermetallics that can form, the Au concentration should be kept below a critical level that most authors set at 3 to 5 percent by weight35,36 For most components used today, a nominal 5- in (01-mm) thickness Au flash to preserve solderability is harmless However, if thicker Au plating (eg, for connector contacts or wire bonding) is used, if the component lead pitch is less than 05 mm, or if the component lead terminations are also Au-plated, care should be taken to ensure that the Au concentration remains below the 3 to 5 percent by weight limit.

For some applications in which use of thick Au is unavoidable, 50In-50Pb solder, in which Au dissolves very slowly, has been used to get around this problem37 Selective thick Au plating is another option The Au concentration in the finished reflowed solder joint can be estimated using the following equation: Wt % Au = (Au volume) [(Au volume) + (solder volume)(rsolder/Au)].