1. Technical Field
The present disclosure generally relates to electronic package structures and methods for manufacturing such electronic package structures.
2. Description of Related Art
In electronics, a ceramic package is popularly employed for large size electronic components, such as crystal oscillators. A gap with a size less than 10 microns is generally formed between the electronic component and a substrate when the electronic component is mounted on the substrate by a surface mounting technology (SMT) process. During a molding process for packaging the electronic component on the substrate, molten encapsulating material (such as resin) fails to flow into the gap due to the small size of the gap. As a result, during a subsequent reflow soldering process, the package module with the electronic component may easily short or become cracked due to the gap between the bottom of the electronic component and the substrate.
Therefore, a need exists in the industry to overcome the described problems.
Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, all the views are schematic, and like reference numerals designate corresponding parts throughout the several views.
The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings, in which like reference numerals indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references can mean “at least one” embodiment.
With reference to
During mounting the electronic component 30 on the substrate 10 by a surface mounting technology (SMT) process, the height H1 of the gap 50 does not change when tin solder 60 between the electronic element 30 and the substrate 10 melts, because the electronic component 30 is supported by the metal support elements 20 that do not be melt during the SMT process. During a subsequent molding process, molten material for forming the encapsulation body 40 flows into the gap 50 and fills the gap 50 completely without forming any voids or air bubbles between the electronic component 30 and the substrate 10. This enables the electronic package structure 100 to achieve good performance.
In the embodiment, the height H3 of the metal support elements 20 is about 30˜70 microns, which ensures that the encapsulation body 40 fills the gap 50 completely.
In the embodiment, the metal support elements 20 are made of copper. Alternatively, the metal support elements 20 can be made of gold or aluminum.
Typically, a surface of each of the metal support elements 20 is coated with the tin solder 60. Each of the metal support elements 20 is integrated with the tin solder 60 to form a solder portion 70, to support and secure the electronic component 30 on the substrate 10. When the gap 50 is filled with the encapsulation body 40, the electronic element 30 is securely electrically connected to the substrate 10 due to the tin solder 60.
A method of fabricating the electronic package structure 100 comprises steps as follows.
The plurality of solder pads 11 are provided on the substrate 10 to electrically connect the substrate 10 to the electronic component 30.
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Although the features and elements of the present disclosure are described as embodiments in particular combinations, each feature or element can be used alone or in other various combinations within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Number | Date | Country | Kind |
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201110247329.4 | Aug 2011 | CN | national |