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Electrical Performance of Lead-Free Compatible FR-4 Materials Most of the FR-4 laminate materials developed for lead-free assembly applications use an alternative resin chemistry in comparison to the conventional dicyandiamide ( dicy ) cured FR-4s. The most common alternatives are commonly referred to as phenolic or novolac cured materials. Although there is some variation between these materials, as a group they tend to exhibit somewhat different electrical performance, particularly with respect to dielectric loss, or Df. For most applications operating in typical frequency ranges, the differences are not significant. However, as operating frequencies increase toward the higher end of FR-4 applications and impedance control becomes more critical, these differences can become very significant. Table 9.8 includes two common dicy-cured FR-4 materials (A and C) and two phenolic FR-4 materials compatible with many lead-free assembly applications (B and D). It also includes a lead-free compatible material (E) designed to improve Dk and Df performance in comparison to the phenolic lead-free compatible materials. Note that different types of measurement systems can result in different measured values for Dk and Df. Laminate resin contents and other factors also influence these properties. Thus, in Table 9.8 the comparisons between these materials are more important than the absolute values reported for each material. For these comparisons, the same measurement system and resin contents were used.

TABLE 9.8 Properties of Several Base Material Types Glass Transition Temp., C 140 150 175 175 200 % Expansion, 50 260 C (40% RC) 4.2 3.4 3.5 2.8 2.8

Description Dicy-cured, 140 C Tg FR-4 Phenolic, Mid-Tg FR-4 Dicy-cured, High-Tg FR-4 Phenolic, High-Tg FR-4 Non-Dicy, Non-Phenolic

We set gc = g cb = 0 because g = g = 0, g = a 2 , where a is a constant, x xb and so all derivatives of these terms vanish. The only possibility is

In Table 9.8, the improved phenolic FR-4 materials are clearly not quite as good in terms of electrical performance at higher frequencies as the conventional dicy-cured materials, particularly with respect to Df . However, material E exhibits thermal properties at least as good as the phenolic materials. In addition, the electrical performance of material E is even better than the conventional dicy-cured materials, especially in terms of Df performance. Figures 9.30 and 9.31 provide higher frequency Df and Dk data for several lead-free compatible FR-4 materials in comparison to a standard dicy-cured, high-Tg FR-4, using a split-post resonant cavity test method. It also includes data for the non-dicy/non-phenolic material. Note that there is a wide range of Df values for the phenolic materials, and to a lesser extent some variation in Dk values

0.026 0.024 0.022 0.02 Df 0.018 0.016 0.014 0.012 0.01 2 5 Frequency (GHz) High-Tg Dicy Phenolic A Phenolic B

as well. In comparison, the non-dicy/non-phenolic material offers lower and more stable Df properties and a slightly lower Dk. Furthermore, Table 9.9 provides several laminate constructions for a common phenolic material, along with resin content and Dk data at 2 and 5 GHz. Note how different constructions and resin contents can vary in Dk values. Table 9.10 provides the same construction data with Df data at 2 and 5 GHz. Tables 9.11 and 9.12 provide this same data for the non-dicy/nonphenolic material with additional data at 10 GHz.

TABLE 9.9 Laminate Constructions and Dk Data for a Common Phenolic FR-4 Core Thickness 0.0025 0.0030 0.0035 0.0040 0.0043 0.0050 0.0053 0.0060 0.0070 0.0070 0.0080 0.0095 0.0100 0.0120 0.0140 0.0180 0.0210 0.0240 0.0280 0.0310 0.0340 0.0350 0.0390 Standard Construction 1-1080 1-2113 2-106 1-2116 106/1080 1-1652 106/2113 1080/2113 1-7628 2-2113 2-2116 2-2116 2-1652 2-1080/7628 2-7628 2-7628/2116 3-7628 3-7628/2113 4-7628 4-7628/2116 5-7628 5-7628 6-7628 Resin Content 58 44 65 45 60 42 56 53 41 51 45 52 42 47 41 42 39 41 40 40 40 41 37 Dk@ 2.0 GHz 3.72 4.04 3.58 4.02 3.68 4.10 3.76 3.83 4.12 3.87 4.02 3.85 4.10 3.97 4.12 4.10 4.18 4.12 4.15 4.15 4.15 4.12 4.23 Dk@ 5.0 GHz 3.65 3.98 3.50 3.96 3.60 4.04 3.69 3.76 4.07 3.81 3.96 3.78 4.04 3.91 4.07 4.04 4.12 4.07 4.09 4.09 4.09 4.07 4.18

TABLE 9.10 Laminate Constructions and Df Data for a Common Phenolic FR-4 Core Thickness 0.0025 0.0030 0.0035 0.0040 0.0043 0.0050 0.0053 0.0060 0.0070 0.0070 0.0080 0.0095 0.0100 0.0120 0.0140 0.0180 0.0210 00240 0.0280 0.0310 0.0340 0.0350 0.0390 Standard Construction 1-1080 1-2113 2-106 1-2116 106/1080 1-1652 106/2113 1080/2113 1-7628 2-2113 2-2116 2-2116 2-1652 2-1080/7628 2-7628 2-7628/2116 3-7628 3-7628/2113 4-7628 4-7628/2116 5-7628 5-7628 6-7628 Resin Content 58 44 65 45 60 42 56 53 41 51 45 52 42 47 41 42 39 41 40 40 40 41 37 Df@2.0 GHz 0.026 0.021 0.028 0.021 0.026 0.020 0.025 0.024 0.020 0.023 0.021 0.024 0.020 0.022 0.020 0.020 0.019 0.020 0.020 0.020 0.020 0.020 0.019 Df@5.0 GHz 0.027 0.022 0.029 0.027 0.028 0.021 0.026 0.025 0.021 0.024 0.027 0.025 0.021 0.023 0.021 0.021 0.020 0.021 0.021 0.021 0.021 0.021 0.020