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US 7,116,122 B2Granted
Method for ball grid array chip packages having improved testing and stacking characteristics
AssigneeMicron Technology, Inc.
InventorsWuu Yean Tay, Jeffrey Toh Tuck Fook
Life of this patent
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Abstract
A stackable ball grid array (BGA) or fine ball grid array (FBGA) semiconductor package particularly suitable for board-on-chip or chip-on-board applications in which a low profile BGA or FBGA semiconductor package is needed. The stackable ball grid array (BGA) or fine ball grid array (FBGA) provides a semiconductor package that is capable of being burned in and tested in a more efficient and cost effective manner than prior known BGA or FBGA semiconductor packages. A high density, low profile memory module incorporating a plurality of the disclosed BGA or FBGA semiconductor packages in a stacked arrangement is further disclosed.
Claims21
A method for using a test fixture having a first pattern of contacts for burning-in and testing ball grid array semiconductor packages having a second pattern of contacts unrelated to the test fixture, comprising:
- forming a plurality of ball grid array connective elements on one of a first surface and a second surface of a portion of a substrate having an aperture therethrough;
- forming a plurality of test pads on a severable portion of the portion of the substrate, the plurality of test pads arranged in a first preselected pattern and connected to the second pattern of contacts forming the ball grid array connective elements, the first preselected pattern of test pads having a predetermined pattern corresponding to the second pattern of contacts eliminating modification of the test fixture mating with a ball grid array semiconductor package;
- providing a burn-in and test fixture having a pattern of contacts having a first predetermined pattern corresponding to a second pattern of contacts of an unrelated semiconductor die;
- providing a plurality of ball grid array semiconductor packages connected to the substrate, each ball grid array semiconductor package of the plurality including:
- a portion of the substrate having a first surface and a second surface opposite the first surface and having an aperture through the portion of the substrate in communication with the first and second surfaces thereof;
- attaching a semiconductor device having an active surface with a plurality of bond pads thereon to one of the first and second surfaces of the substrate with the plurality of bond pads exposed within the aperture of the substrate;
- forming a plurality of ball grid array connective elements on one of the first surface and the second surface of the portion of the substrate;
- forming a plurality of substrate bond pads on one of the first surface and the second surface of the portion of the substrate;
- connecting selected bond pads of the plurality of substrate bond pads on the active surface of the semiconductor device with selected substrate bond pads of the plurality of substrate bond pads using a plurality of bond wires extending therebetween;
- providing a first plurality of circuit traces selectively connecting the selected substrate bond pads of the plurality of substrate bond pads with selected connective elements of the plurality of ball arid array connective elements;
- providing a second plurality of circuit traces selectively connecting the selected connective elements of the plurality of ball grid array connective elements with selected test pads of the plurality of test pads;
- placing at least one ball grid array semiconductor package in a burn-in and test apparatus having a plurality of test probes;
- contacting selected test probes of the plurality of test probes with the selected test pads of the plurality of test pads;
- burning-in and testing the at least one ball arid array semiconductor package by applying and routing electrical energy to the selected test pads of the plurality of test pads by way of the selected test probes of the plurality of test probes;
- and
- severing the portion of the substrate to form at least one ball grid array semiconductor package.
13 more elements
A ball grid array semiconductor package comprising:
- a substrate having a first surface, a second surface, an aperture extending from the first surface through the substrate to the second surface, at least one substrate bond pad located on at least one of the first surface and the second surface proximate the aperture, at least one intermediately positioned connective element located on the at least one of the first surface and the second surface, and at least one test pad located on the at least one of the first surface and the second surface on a portion of the substrate, the at least one intermediately positioned connective element comprises one of a contact pad, a solder ball, and a contact pad with a solder ball disposed thereon;
- a semiconductor device having a plurality of bond pads thereon, the semiconductor device attached to one of the first surface and the second surface of the substrate;
- at least one first circuit trace extending from the at least one substrate bond pad to the at least one intermediately positioned connective element;
- at least one second circuit trace extending from the at least one intermediately positioned connective element to the at least one test pad located on the at least one of the first surface and the second surface on the portion of the substrate;
- and
- at least one connection connecting at least one of the plurality of bond pads of the semiconductor device with the at least one substrate bond pad.
3 more elements
An assembly comprising:
- a board having a first surface and a second surface, the board including at least one electrical circuit for electrical contact with at least one ball grid array of a semiconductor package;
- at least one of the first surface and the second surface of the board comprising:
- a first ball grid array semiconductor package attached to the at least one of the first and second surfaces of the board by a plurality of mutually complementary connective elements connected to the at least one electrical circuit of the board, the first ball grid array semiconductor package comprising:
- a substrate having a first surface, a second surface, and an aperture extending therethrough, a plurality of substrate bond pads located on the first surface adjacent the aperture, and a plurality of mutually discrete conductive circuit traces, each circuit trace of the plurality of mutually discrete circuit traces for extending from at least one of the plurality of substrate bond pads;
- the plurality of mutually complementary connective elements connected to the board being attached to and extending from the second surface of the substrate and arranged in a preselected grid array pattern having at least one preselected pitch dimension between adjacent connective elements, each connective element connected to a circuit trace of the plurality of circuit traces;
- a semiconductor device having an active surface and a plurality of bond pads located thereon, the semiconductor device attached to the second surface of the substrate and positioned adjacent to the board;
- and
- a plurality of bond wires extending through the aperture, each of the plurality of bond wires connecting one of the plurality of bond pads on the active surface of the semiconductor device with one of the plurality of substrate bond pads on the first surface of the substrate.
5 more elements
Dependencies are inferred from the claim text.