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Lead Finish A42 Definition

Looking at P/N CD54ACT32F3A information; details link from CD54/CD74 information page lists finish as A42. No link to a definition. Searching A42 turns up nothing useful. What is the actual finish for this part? Where do you hide that information?

Thanks in advance 

  • This is all I could find. If you need more this should go on the High reliability forum.

    Leadframe

    NameValue
    Leadframe 4202755-0001
    Leadframe Descriptor 14 PIN C-DIP
    Leadframe Finish POST-PLATE
    Leadframe Base Metal A42

    Wire

    NameValue
    Wire SID#031020006T
    Wire Supplier ---
    Wire Alloy ---
    Wire Diameter 31.8 UM (1.25 MIL)
    Wire Base Metal Al

    Mold Compound

    NameValue
    Mold Compound ---
    Mold Compound Supplier ---
    Mold Compound Supplier Number ---
    Mold Compound Diameter ---
    Mold Compound Weight ---

    WCSP

    NameValue
    Coating -- n/a --
    Coating Material -- n/a --
    Solder Bump -- n/a --
    Solder Bump Finish -- n/a --

    Product Content

    NameValue
    Weight (mg) 0.0
    NiPdAu Thickness
    Ni = 0.5um - 2.0um, Pd = 0.01um - 0.10um, Au = 0.003um - 0.009um
    Sn Plating Grain Size Contact Packaging Group
    Plating Under Layer For NiPdAu plating the under layer is Pd with a thickness of 0.4um to 4.0um. For Sn plating there is no under layer.
  • A42 is an older Lead finish for TI.  I found some references to on some older datasheets that indicate that this references an industry standard "Alloy 42" Lead Frame, which has a core composition of Tin and Lead (SnPb) lead finish.