Tape ball grid array package with perforated metal stiffener
First Claim
1. An electronic package, comprising:
- an integrated circuit chip having a first surface whereon contact pads are located, said contact pads representing electrical interconnection points of the chip;
a non-conductive tape having a plurality of conductive traces electrically coupled to the contact pads of the chip;
a plurality of solder balls coupled to the plurality of conductive traces; and
a stiffener affixed to the tape that has a plurality of vent holes therein.
10 Assignments
0 Petitions
Accused Products
Abstract
A tape ball grid array (TBGA) package, and a method of making a TBGA package, includes the use of a metal or other stiffener affixed to a flexible tape on which conductive traces connect contact points on an integrated circuit (IC) chip with an array of solder balls. The stiffener is perforated with a pattern of small vent holes. The TBGA package materials are hygroscopic. When the TBGA package is heated during 2nd level packaging, e.g., during solder reflow, moisture absorbed within the hygroscopic materials evaporates and the resulting water vapor is able to escape through the vent holes, rather than becoming trapped within the IC package and introducing various 2nd level packing failure modes.
346 Citations
20 Claims
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1. An electronic package, comprising:
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an integrated circuit chip having a first surface whereon contact pads are located, said contact pads representing electrical interconnection points of the chip; a non-conductive tape having a plurality of conductive traces electrically coupled to the contact pads of the chip; a plurality of solder balls coupled to the plurality of conductive traces; and a stiffener affixed to the tape that has a plurality of vent holes therein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A tape ball grid array (TBGA) integrated circuit (IC) package for housing a semiconductor integrated circuit (IC) chip, said IC chip having contact pads thereon, comprising:
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means for electrically connecting the contact pads of the IC chip to conductive traces on a first surface of a tape; means for electrically coupling solder balls on a second surface of the tape to each conductive trace connected to a contact pad of the IC chip; and stiffener means for adding rigidity to said tape, said stiffener means having vent means therein for venting water vapor or other gases absorbed within the tape or other materials of the TBGA IC package during a second level packaging operation. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of making a tape ball grid array (TBGA) integrated circuit package wherein an integrated circuit (IC) chip, having contact pads on one surface thereof, is housed, said method comprising:
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forming conductive traces on a surface of a non-conductive tape; electrically connecting the contact pads of the IC chip to the conductive traces on the tape; electrically coupling a solder ball to each conductive trace connected to a contact pad of the IC chip; and attaching a perforated stiffener material to the non-conductive tape, said perforated stiffener having a plurality of vent holes therein, thereby providing an escape channel through which a gas, such as water vapor, may vent during a second level packaging operation. - View Dependent Claims (19, 20)
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Specification