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Browse Prior Art Database

Shaped Strip Lead Interconnections With Lead Tin Rivets And Chip Carriers With Notches

IP.com Disclosure Number: IPCOM000099982D
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Hinrichsmeyer, K: AUTHOR [+3]

Abstract

Chip carriers are assembled in the vertical dimension by means of individual module pins, leads or clips. Functional testing is carried out after complete solid interconnection.

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This is the abbreviated version, containing approximately 61% of the total text.

Shaped Strip Lead Interconnections With Lead Tin Rivets And Chip Carriers With Notches

       Chip carriers are assembled in the vertical dimension by
means of individual module pins, leads or clips.  Functional testing
is carried out after complete solid interconnection.

      A unique interconnection lead frame and a chip carrier with
notches are proposed for stacking, for example, a multitude of array
chip carriers in an optimum fashion on top of each other.  The
interconnection leads of the substrates are characterized by flat
sections which accurately fit the substrate notches and which contain
tin solder rivets contacting the sidewalls of the notches, and by
sections extending the notches of the substrate at the top and
bottom.

      Three different versions are possible:
      1.   Round metal leads with punched sections for the substrate
notches and holes for the rivets.
      2.   Flatband metal leads with twisted segments and holes for
the rivets.
      3.   Flatband leads folded and split longitudinally with pairs
of holes for the rivets (see Figs. 1, 2 and 3).

      The drilled or punched holes in the leads are filled with lead
tin of any combination, which provides a relatively high melting
point for further low-temperature soldering processes.  The lead tin
material is rivet-shaped with flattened semicircular heads on either
side of the flat lead sections.  The dimensions of the rivets are
chosen such that they can...