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Ionic contaminants, which dissolve in the moisture on the surface, increase the conductance (lower the resistance) of the insulating layer between the anode and cathode. Their presence enhances electrochemical migration. How much the migration is enhanced depends on several factors: the solubility of the ion, the mobility of the ion, the effect of pH on solubility, the reactivity of the ion, temperature, and relative humidity. The solubility of the ion and its mobility in water are important because conductivity depends on both of these factors (see Eq. 56.9).

(56.9)

Ni = the number of charge carriers of a particular type (e.g., Na+ cations, or Cl anions) qi = the charge of the carrier mi = the mobility of the charge carrier

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Stand-ups are short meetings among coworkers, usually held daily to share project status or updates on the current realities of a job or team. As the name indicates, everyone typically stands for this quick interaction. A typical stand-up lasts only ve to ten minutes and is held at the same time every day. The format is structured but casual, and in many settings, everyone is invited to make a quick comment after the leader starts off with announcements. Not much preparation is necessary on the part of the participants; however, the facilitator must be focused and concise.

The mobility of a given ion is dependent on temperature and its diffusion coefficient per Eq. 56.10: q ion = Dion kT where k = Boltzmann s constant T = degrees Kelvin Dion = Diffusion constant for a particular ion. (56.10)

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Tables of ionic conductance in aqueous solution as well as diffusion constants can be found in the Handbook of Chemistry and Physics.7 Most contaminants from processing do not exist in isolation from one another. Rather, there may be several ionic species present, some of which will interact to create new ionic species. Solubility of the contaminant salts also depends on the pH.Water ionizes under a bias voltage, creating an acidic medium at the anode and a basic medium at the cathode, as shown in the following reactions: Anode: Cathode: H2O = 1/2O2 + 2H+ + 2e 2H2O + 2e = 2OH + H2 or O2 + H2O + 4e = 4(OH)

Temperature is another important factor to consider. An increase in temperature increases ion solubility, mobility, and reactivity. In summary, several factors affect electrochemical migration. These include the nature of substrate and metallization, the presence of contaminants, the voltage gradient, and the presence of sufficient moisture. This last element is critical, for without sufficient monolayers of water on the surface, ion mobility is impossible.

A number of factors affect CAF formation. These include substrate material, conductor configuration, processing, voltage and spacing, soldering flux, and humidity in the storage and use environment.

Substrate Material Lando et al.4 compared FR-4 with several substrates: G-10 (a non-fire-retardant epoxy/ woven glass material), polyimide/woven glass (PI), triazine/woven glass, epoxy/woven kevlar, and finally polyester/woven and chopped glass. Similarly, B. Rudra et al.8 performed an extensive experimental comparison among the substrates: bismaleimide triazine (BT), cyanate esters (CE), and FR-4. In addition, Ready9 compared the CAF susceptibilities of FR-4 with CEM-3 (a substrate similar to G-10 except with chopped glass) and MC-2 (a blended polyester and epoxy matrix with woven glass face sheets and a chopped glass core). Of all materials tested by these investigators, the BT material proved to be most resistant to CAF formation (due to its low moisture absorption characteristics). Conversely, the MC-2 substrate proved to have the least resistance to CAF formation. The susceptibility of the materials follows the trend below: MC-2 > Epoxy/Kevlar > FR-4 ~ PI > G-10 > CEM-3 > CE > BT To ensure immunity to CAF, the laminate of preference is BT. In recent years, laminate suppliers have developed other CAF-resistant substrate materials. However, there is a cost penalty to consider. 56.4.1.1 Conductor Configuration. Lando et al.4 evaluated several different conductor configurations:

Using R jl = 2K g jl together with (12.3) and grr = e2 f , we obtain the following differential equation: 2 df = 2K e2 f r dr Cross multiplying we obtain e 2 f d f = K r dr

Line-to-line (L-L) Hole-to-line (H-L) Hole-to-hole (H-H)