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recorded (Td 2 percent), and the temperature to a 5 percent weight decrease is subsequently recorded (Td 5 percent) IPC-4101 RoHS-compliant laminates pass Td 5 percent at 340 C minimum Delta Td (Td 5 percent Td 2 percent) is considered by some as an indicator for the onset and rapidity of decomposition For laminates with identical Td 5 percent values but differing Td 2 percent values, the lower the delta Td the more thermally resistant the material Note that Tg and Td do not correlate A low Tg material can have a high Td and vice versa Materials with identical Tg can have different Td See Fig 272 for an example of a TGA plot 272224 Coefficient Of Thermal Expansion (CTE).

The CTE of a laminate is comprised of values for x-y axis, or in-plane expansion, and z-axis, or vertical expansion (which is further comprised of the percent expansion below and above the glass transition temperature) The data are reported in ppm/ C; a typical plot is shown in Fig 273 The x-y CTE for standard FR-4 at 14 to 20 ppm/ C is higher than for ceramic or silicon The resulting thermal expansion mismatch between an ML-PWB and the attached devices can lead to solder joint fatigue failures when the system undergoes multiple heat cycles during power-up and power-down Packages with compliant leads can accommodate the CTE mismatch and so can be used with standard ML-PWB material systems The z-axis CTE for standard 130 to 135 C Tg FR-4 is typically about 40 ppm/ C Tg and 250 ppm/ C > Tg.

R = 0

At LFA temperatures of 245 to 260 C, the material expansion is so dramatic that the traditional materials experience delamination and PTH ruptures The new generation of Lead Free Assembly Capable( LFAC) FR-4 laminates generally utilizes one or both of the following approaches to minimize the CTE above Tg: a change to non-dicy curing agents, typically phenolic, and/or the dispersion in the resin of some amount of inorganic fillers to restrain the z-axis expansion..

100 95 90 Weight (%) 85 80 75 70 65 60

50.5 C

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Temperature ( C)

0.11 0.10 0.09 0.08 Displacement (mm) 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0.00 0.01 20

Tg = 161.90 C 105.91 C CTE: 46.37 u m/m C 80 100 120 140 160 Temperature ( C) 180 200 220 240

38.38 C 40 60

27.2.2.2.5 Moisture Absorption. Moisture is the enemy of an ML-PWB. Absorbed water raises Dk somewhat and can raise tan d significantly, hampering the functioning of the circuit at high frequencies. For applications in humid environments, a low moisture-absorbing material should be selected. Additionally, moisture absorption increases leakage current, which in turn degrades the ability of the material to resist CAF formation under bias. Trapped moisture expands with temperature, so the board sees more thermal expansion (additive to the effects of the laminate CTE) at assembly, which causes thermal defects such as delamination, blistering, or barrel cracking. The severity of these problems depends on the storage environment prior to soldering and the peak temperature of the reflow. If storage times are short, humidity is low, and reflow temperature is moderate, moisture will not be a serious issue. However, if the ML-PWB material has high moisture absorption, or is subjected to high humidity for an extended period of time, or if the assembly temperature is especially high, special care must be taken. This can include storing with a desiccant, baking prior to assembly, or both.

Properties of the Resin Systems Materials with highly cross-linked epoxy resin reinforced with woven fiber glass are the most common in use Bromine is reacted with the epoxy matrix and is used to provide fire retardancy Most epoxy-based materials satisfy the Underwriters Laboratories (UL) classification of V-0 for fire retardancy The generic term for this family of epoxy resin materials is FR-4, with FR standing for flame retardant and 4 an assigned number indicating epoxy Epoxyfiberglass materials are sold by many suppliers and have become a commodity material 27231 Epoxies A variety of epoxies are available for use, including halogen-free epoxies and materials with enhanced thermal, electrical, and mechanical properties 272311 Standard Epoxies Two resin systems are used to make GF laminate: difunctional and tetrafunctional These systems are distinguished by the nature of the epoxy crosslinking.