CAVITY TAPE FOR PACKAGE PROTECTION
An apparatus includes a tape having a tape thickness extending from a first surface to a second surface and a plurality of cavities formed in the first surface. Each cavity has dimensions along the first surface that are less than dimensions of a corresponding package. Each cavity has a cavity depth that is less than the tape thickness such that a base portion of the tape has a base thickness that is less than the tape thickness.
1 . An apparatus comprising:
a tape having a tape thickness extending from a first surface to a second surface; and
a plurality of cavities formed in the first surface, each cavity having dimensions along the first surface that are less than dimensions of a corresponding package, each cavity having a cavity depth that is less than the tape thickness such that base portion of the tape has a base thickness that is less than the tape thickness.
2 . The apparatus of claim 1 , wherein the cavity depth is approximately equal to a height of solder balls located on a surface of the corresponding package.
3 . The apparatus of claim 1 , wherein the cavity depth is greater than the height of a plurality of solder balls located on a surface of the corresponding package.
4 . The apparatus of claim 1 , wherein the tape is formed of polyimide.
5 . The apparatus of claim 1 , further comprising an adhesion layer on the first surface of the tape.
6 . The apparatus of claim 1 , wherein the tape is formed of a base layer having the base thickness and a window layer overlying the base layer, the window layer attached to the base layer, each cavity extending through the window layer such that the cavity depth is equal to thickness of the window layer.
7 . The apparatus of claim 1 , wherein the tape is formed of a base layer having the base thickness and a plurality of walls extending up from the base layer and having a height equal to the cavity depth.
8 . The apparatus of claim 1 , further comprising a plurality of packages, each package including one or more encapsulated die, each package aligned with a corresponding cavity of the plurality of cavities and having solder balls that extend into the corresponding cavity.
9 . The apparatus of claim 8 , further comprising an electrically conductive layer extending over the plurality of packages and over exposed portions of the first surface between packages.
10 . A method comprising:
aligning a plurality of packages with a plurality of cavities of a cavity tape, each package having a plurality of solder balls extending from a central area, the plurality of packages aligned such that the central area of each package is disposed over a corresponding cavity and the plurality of solder balls extend into the corresponding cavity with a base portion of the cavity tape underlying the cavity; and
depositing an electrically conductive layer over the plurality of packages and the cavity tape.
11 . The method of claim 10 , further comprising adhering a peripheral area of the plurality of packages to the cavity tape with an adhesion layer that extends between the plurality of cavities along an upper surface of the cavity tape to seal the plurality of cavities.
12 . The method of claim 10 , wherein the cavity tape is formed by bonding a window tape with a base tape, the window tape having openings that extend through the window tape and having a first thickness that is equal to depth of the plurality of cavities, the base tape having a second thickness equal to thickness of the base portion underlying cavity.
13 . The method of claim 10 , wherein the cavity tape is formed using a masking layer over a base tape and depositing tape material to form the plurality of cavities in a pattern established by the masking layer.
14 . The method of claim 10 , further comprising, prior to aligning the plurality of packages with the plurality of cavities:
forming the plurality of packages by encapsulating a plurality of dies;
forming the solder balls on the plurality of packages; and
separating the plurality of packages.
15 . The method of claim 10 , wherein depositing the electrically conductive layer includes sputtering one or more metal that includes copper.
16 . The method of claim 10 , further comprising causing the solder balls to contact the base portion of the cavity tape underlying the corresponding cavity.
17 . The method of claim 10 , further comprising causing the solder balls to be separated from the base portion of the cavity tape underlying the corresponding cavity by a gap.
18 . An apparatus comprising:
a plurality of integrated circuit packages each having solder balls extending from a surface; and
means for protecting the surfaces and solder balls of the plurality of integrated circuit packages during deposition of an Electromagnetic Interference (EMI) protection layer by enclosing the solder balls of each integrated circuit package in a corresponding cavity that extends from the surface to a base portion that underlies the corresponding cavity.
19 . The apparatus of claim 18 , further comprising an adhesion layer formed on the means for protecting to adhere the plurality of integrated circuit packages to the means for protecting.
20 . The apparatus of claim 19 , wherein each of the integrated circuit packages includes at least one NAND flash memory die.