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Care must be taken to ensure solvent compatibility with the OSP coating and its impact on the coating s ability to protect the copper after cleaning Another deficiency of OSP-Cu is found at in-circuit test (ICT) As the board is passed through top- and bottom-side reflow cycles and wave soldering, the unsoldered and unfluxed test points build up a layer of copper oxide This oxide layer is difficult to pierce even with sharp pin- or blade-type ICT probes, resulting in open circuits and multiple fixture reseatings to attain probe penetration and electrical contact Some have adopted coating the test points with solder; however, no-clean residues can also lead to ICT probe contact problems The best strategy goes against modern PCA practices: reverting to the use of water-clean solder paste and wave solder flux and coating test points with solder paste.

For any application based on the Model-View-Controller (MVC) architectural principle, where the business service is separated from the implementation of the UI, the two tiers need to be bound together. ADF Model provides this binding and is responsible for ensuring that a specific piece of data from the business service, such as an order item, is bound to an appropriate UI component, such as a table. Furthermore, if the user wants to delete an order item through an action like a button click, ADF Model ensures that the button is associated with the appropriate business service action to perform the deletion. This chapter gives an insight into ADF Model and how it provides the binding between the business service and the UI. ADF Model provides a number of significant benefits to the developer. The first is that it implements the physical binding of a UI component to a business service. ADF Model enables you to do this by providing a framework feature, called a binding container, that acts as the glue between a page and the business service. The second benefit is that ADF Model provides a layer of abstraction over the underlying implementation. So, regardless of how the business service is implemented, such as ADF Business Components, web services, or simple Java classes, it is always presented to the UI in the same way. This means that the View layer can be developed in a consistent manner, since the integration and interaction with the business service is always performed through ADF Model.

The post-soldering, aqueous cleaning cycle removes any flux residues, enhancing ICT probe contact on solder-coated test point on the finished PCA Most large electronic manufacturers have worked diligently to remove aqueous cleaning from their factories a move for improved process economics and significant environmental impact Therefore, OSP-Cu is best used where ICT is not required, such as on low-end consumer products 4563 Electrolytic Nickel/Electrolytic Gold This plating combination has been in use for many years and is considered a high-end surface finish but a highly reliable one in terms of solderability and product life The amount of gold (Au) is small, but the plating process uses toxic and expensive materials that further increase the price of the plating This plating system should not be confused with electroless nickel/immersion gold (ENIG) That surface finish will be discussed separately and does not have the reliable history of electrolytic nickel/electrolytic gold.

The electroplated nickel (Ni) serves as a barrier between the copper and the gold Ni on its own is a poor candidate for a solder pad coating as it oxidizes rapidly and its native oxide is very stable chemically tough to dissolve or react away Unoxidized Ni can alloy with tin, which means that it can be soldered Were the gold deposited over the copper directly, the gold layer would begin to interdiffuse with the copper even at room temperature forming an.

intermetallic compound The reaction rate is temperature-dependent This intermetallic, like most intermetallic compounds, is difficult to solder, requiring a higher process temperature, a more active fluxing agent, or both The Au-Cu system has poor solderability and the brittleness of this intermetallic results in diminished solder-joint strength Ni-Au coatings are in widespread use worldwide Ni coating thickness is generally on the order of 254 mm (>100 min) Au is a more difficult metal to plate It tends to coalesce into islets, resulting in a porous coating Any pores in the gold overcoat allow oxidation of the underlying Ni, rendering it locally unsolderable To preclude this, the gold is liberally plated with a targeted minimum thickness greater than about 0127 mm (5 min) to ensure complete Ni coverage There are problems with the Ni-Au metallurgical system First and foremost, it is well known that gold can cause solder joint embrittlement.

table 4-1 pin alloCationS for the propeller Chip aS uSed in thiS book (continued)