Low cost and highly reliable chip-sized package
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 20, 1999
Grant Date -
N/A
app pub date -
Jan 4, 1996
filing date -
Oct 28, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is directed to a chip-sized package (CSP) and method for making a CSP which is simple to manufacture, less costly and more compact, thus being truly a chip-sized package. The inventive CSP has a chip that has an array of chip ports on an active surface, such as an array of solder or metal bumps or any other conductive material. The chip may be held in a cavity of a frame by a pair of frame tie-bars. An encapsulant encapsulates the chip and portions of the chip ports located near the active surface, leaving portions of the chip ports located away from the active surface exposed. Package ports, such as solder balls may be attached to the portions of the chip ports located away from the active surface and used to attach the CSP to a printed circuit board. Various methods are used to leave portions of the chip ports located away from the active surface exposed from the encapsulant. The encapsulant may be removed by laser or grinding to expose portions of the chip ports. Alternatively, prior to encapsulation, the chip ports are positioned to sit on a mold, so that removing the mold leaves exposed the portions of the chip ports that were in contact with the mold. The mold may have an array of mold bumps or mold pockets upon which the chip ports sit. Removing the mold, exposes portions of the chip ports and leaves an array of openings in the encapsulant. Another method to form the array of openings in the encapsulant and expose portions of the chip ports uses an array of pins that are inserted in the encapsulant before it cures. The pins are inserted to contact the chip ports. Retracting the array of pins forms the array of openings in the encapsulant and exposes portions of the chip ports that were in contact with the pins.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- INSTITUTE OF MICROELECTRONICS
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Lim, Thiam Beng | Singapore, SG | 10 | 373 |
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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