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US4915607A Expired / Lapsed US ⏱️ 0.0 years remaining

Lead frame assembly for an integrated circuit molding system

Assignee: Texas Instruments Inc
•
Filing: 1988-10-06
•
Granted: 1990-04-10
•
Expires: 2008-10-06
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Abstract

Abstract A lead frame assembly is disclosed which interfaces with existing wire bonders using a single track design from the bonder through the molding process. During the molding operation, the bonded lead frame is transferred into the mold on a guide track system built into the mold chase. The mold closes and clamps the lead frame after which a compound charging system meters and injects a compound into the mold cavities. The mold is opened and the strip ejected and transferred out of the mold via internal guide tracks. A granular or pellet form of compound is used in the charging system. The lead frame assembly has side rails, between which a temporary and a permanent support structure is formed. The temporary support structure is removed from the bonded integrated circuits after the bonding process is completed, while the permanent structure is made a part of the bonded integrated circuit package. A portion of the temporary support structure has a hole through it, which allows the bonding compound to pass through the lead frame to enable encapsulation of the integrated circuit both above and below the lead frame in the bonding cavity.

Inventors

  • 👤 Jerry B. Medders
  • 👤 Susan S. Fitzgerald
  • 👤 Donald R. Kelley
  • 👤 Jeffrey L. Popken

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 20:01
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0441; B; B29; B29C; B29C45/00; B29C45/02; B29C45/14; B29C45/14639; B29C45/14655; B29C45/17; B29C45/18; B29C45/26; B29C45/27; B29C45/2701; B29C45/2708

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 126 words
A lead frame assembly for use with a multiple charge transfer molding system, the molded system having a mold cavity with upper and lower mold cavity portions, and a gate allowing injection of molding compound into the mold cavity, said lead frame assembly including two side rails, lead pins, a permanent support base, and temporary support structure, the side rails connected to the lead pins and support base in part by the temporary support structure, part of the temporary support structure having an opening therein through which the molding compound is injectable into the upper mold cavity portion, said opening in the temporary support structure being positioned in the mold cavity above the gate of the mold cavity, said temporary support structure being removable after molding.
Claim 2
Dependent Claim 126 words
A lead frame assembly for use with a multiple charge transfer molding system, the molded system having a mold cavity with upper and lower mold cavity portions, and a gate allowing injection of molding compound into the mold cavity, said lead frame assembly including two side rails, lead pins, a permanent support base, and temporary support structure, the side rails connected to the lead pins and support base in part by the temporary support structure, part of the temporary support structure having an opening therein through which the molding compound is injectable into the upper mold cavity portion, said opening in the temporary support structure being positioned in the mold cavity above the gate of the mold cavity, said temporary support structure being removable after molding.
Claim 3
Dependent Claim 116 words
A lead frame assembly for use with a multiple charge transfer molding system, the molding system having an upper mold chase cavity and a lower molding cavity, and a gate into the lower mold cavity, allowing injection of molding compound into the lower mold cavity, said lead frame assembly including two side rails, lead pins, temporary and permanent support structure, a permanent support structure including a support base, the side rails connected to the lead pins and support base in part by the temporary support structure, part of the temporary support structure having an opening therein through which the molding compound is injectable into the upper mold cavity, said temporary support structure being removable after molding.
Claim 4
Dependent Claim 116 words
A lead frame assembly for use with a multiple charge transfer molding system, the molding system having an upper mold chase cavity and a lower molding cavity, and a gate into the lower mold cavity, allowing injection of molding compound into the lower mold cavity, said lead frame assembly including two side rails, lead pins, temporary and permanent support structure, a permanent support structure including a support base, the side rails connected to the lead pins and support base in part by the temporary support structure, part of the temporary support structure having an opening therein through which the molding compound is injectable into the upper mold cavity, said temporary support structure being removable after molding.

References Cited (Backward Citations)

US3659821A Cited
US3973888A Cited
US4374080A Cited
US4414741A Cited
US4402657A Cited
US4480975A Cited
US4710419A Cited
US4752198A Cited
US4658334A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-04-09 1993-10-09 1994-04-10 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-04-09 1997-10-09 1998-04-10 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-04-09 2001-10-09 2002-04-10 $7700.00 Window Closed / Lapsed

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