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HASL (standard 63/37 Sn/Pb) This has been the standard by which all other surface finishes have been measured It is said that, nothing solders like solder It is a very robust deposit if the solder is maintained for correct alloy ratio and the copper concentration is kept below 03 percent by weight The thinner the deposit the shorter the mean time to failure, whereas the thicker the deposit the more problems with chip placement and paste transfer A good solder level deposit for a 1206 chip pad should not have thickness readings below 50 microinches with an average value of 120 microinches being excellent! The ultimate failure of solder is that after many years in storage, the copper migrates through the deposit and ultimately becomes oxidized upon reaching the surface This renders the deposit unsolderable Before reaching the surface and oxidizing, the growing copper tin intermetallic is solderable.

Surface oxides are typically not an issue for HASL Wetting times are instantaneous for a new deposit, with rapid rise to the maximum wetting force 025 to 027 mN/mm is common when using a standard 02 percent activated test flux As the part ages, there is a slight reduction in wetting forces and a slight increase in wetting times (See Fig 428) HASL (Pb-free) The majority of Pb-free HASL deposits use Cu This is constantly added to as a function of the leveling process In the tin-lead world, this copper is a source of contamination and needs to be controlled tightly For Pb-free HASL it is a more important control point for the deposit Additional copper in the bulk may mean a shorter shelf life as well, and may have an impact on the Liquidus of the surface finish.

Be cautious of using this finish unless the supplier has excessive amounts of data and can show control of the alloy composition I Ag This finish is perhaps the most susceptible to correct storage and packaging Packing materials that contain sulfur will destroy the solderability of the deposit in a very short period of time The use of dessicants (in the majority containing sulfur, though sulfur-free is available), rubber bands, and slip sheet papers that are not pH neutral and sulfur-free should never be part of the packaging materials Never take the PWB s out of their original packages unless to assemble the boards If there are left over PWB s then place them inside a bag and fold it over to prevent air impingement Exposure to the air will result in tarnishing of the surface (sulfate formation) that will destroy solderability.

This can happen in as little as 28 days (See Fig 429) If stored correctly with no exposure to air, a gradual reduction in wetting force due to copper oxide growth will occur..

Figure 42.10 shows the natural reduction in wetting forces for the same I Ag deposit when stored in a bag. The deposit is porous by definition and the reduction in wetting forces is a

note A potentiometer controls the gain in Program 28-1.

0 37 5 0. 75 1. 12 5 1. 5 1. 87 5 2. 25 2. 62 5 3 6 9. 9 37 5 9. 75 3. 75 4. 12 5 4. 5 4. 87 5 5. 25 5. 62 5 5 6. 75 7. 12 5 7. 5 7. 87 5 8. 25 8. 62 5 37 0. 3. 6. 37 5

A Table component is used to display a collection of data as rows and columns. The Table component provides a rich set of features, enabling the user to resize and reposition columns as well as filter rows. This component typically contains a number of child components, including a column component for each column of the table. The column component also has a child component, for example, an output text field in the case of a read-only table. The Table component contains a number of properties to control the look and behavior of the table. ColumnStretching defines which column should automatically be resized if there is any unused space in the component in which the table is placed. FilterVisible defines whether a filter field is placed above each column,

0.05

FIGURE 42.8 The normal deterioration of a 63/37 Sn/Pb HASL finish after 510 days in unprotected storage. Wetting times increase only slightly to 0.05 seconds.

function of copper oxide growth that is forming at the Ag/Cu interface. The speed of wetting is not impacted; even after 629 days of storage, Ag dissolves rapidly at the test temperature of 235 C (approx 50 microinches/second).