Plate and column type semiconductor package having heat sink

An improved plate and column type semiconductor package has a heat sink embedded in a plate, which prevents bending of leads or paddle. The plate includes a plurality of leads and a heat sink which are embedded therein, whereby the mounting of the semiconductor package on the printed circuit board is made easier. A semiconductor chip is attached to the heat sink of the plate and a plurality of metal wires electrically connects a plurality of the leads of the plate and the semiconductor chip.

TECHNICAL FIELD 
The present invention relates to a semiconductor package, and more 
particularly, plate and column type semiconductor package having a heat 
sink. 
BACKGROUND ART 
A quad flat package (QFP)is one type of a semiconductor package, and FIG. 1 
shows the construction of the conventional quad flat package. The quad 
flat package includes a semiconductor chip 3, a paddle 2 on which the 
semiconductor chip 3 is mounted, a lead frame 1 having a plurality of 
leads 1a, 1b provided at both sides of the paddle 2, and a plurality of 
metal wires 4 for electrically connecting the leads 1a of the lead frame 1 
to the semiconductor chip 3. An epoxy molding compound 5 substantially 
encapsulates the lead frame 1 and has a predetermined thickness. The 
above-mentioned leads 1a, 1b are classified into an inner lead 1a and an 
outer lead 1b protruding from the epoxy molding compound. 
The fabrication process of the conventional semiconductor package includes 
a first step for forming a lead frame 1 including leads and a paddle 2, a 
second step for mounting a semiconductor chip 3 on the paddle 2 of the 
lead frame 1, a third step for electrically connecting the leads of the 
lead frame 1 and the semiconductor chip 3 using a plurality of metal wires 
4, and a fourth step for encapsulating the lead frame 1 using an epoxy 
molding compound. Thereafter, a trimming step, and a forming step are 
subsequently performed. The semiconductor package is then mounted on a 
printed circuit board, and information can be stored in the semiconductor 
chip and can be read from the same when voltage is supplied thereto. 
However, the conventional semiconductor package is disadvantaged since the 
paddle 2 has an inclined portion resulting from pressure of an epoxy 
molding compound during the molding process. The leads can be easily bent 
by external impact force applied thereto since the leads extend to the 
outside after the molding process. Hence, the reliability of the 
semiconductor package is decreased. 
In addition, it is difficult to accurately align and mount the 
semiconductor package having a plurality of extended leads on the printed 
circuit board. Moreover, the temperature of the semiconductor package 
increases during the operation of the semiconductor chip when a voltage is 
supplied to the chip, and the generated heat due to the increased 
temperature cannot be effectively emitted to the outside, thereby causing 
malfunctions and errors of the chip. 
DISCLOSURE OF THE INVENTION 
An advantage of the present invention is in providing a plate and column 
type semicondcutor package having a heat sink, which is capable of 
preventing bending of leads or paddle. 
Another advantage of the present invention is in easier mounting of the 
semiconductor package on the printed circuit board. 
A further advantage of the present invention is in preventing malfunctions 
due to the increased heat and effectively emitting heat generated in the 
semiconductor package. 
Still a further advantage of the present invention is enhancing 
productivity by reducing fabricating process steps. 
Such advantages and others are achieved in part by a first embodiment of 
the present invention having a semiconductor package with a heat sink, 
which includes a plate within which a plurality of leads and a heat sink 
are embedded; a semiconductor chip attached to the heat sink of the plate; 
a metal wire for electrically connecting a plurality of the leads of the 
plate and the semiconductor chip; and an epoxy molding compound for 
encapsulating a predetermined portion of the plate. 
The semiconductor package also may have a heat sink, which includes a plate 
within which a plurality of leads and a heat sink are embedded in a shape 
of a column and in which a groove having a predetermined depth and a 
predetermined size is formed in a direction from the upper surface of the 
same to the lower surface of the same; a semiconductor chip attached to 
the heat sink of the plate; a metal wire for electrically connecting a 
plurality of the leads of the plate and the semiconductor chip; and a 
cover attached to the upper surface of the plate. 
The above and other advantages of the invention are achieved in part by a 
component for forming a package of an integrated chip, comprising: a 
member having a predetermined shape and first and second surfaces, wherein 
the member includes a first metallic member formed in the first member for 
receiving the integrated chip, the first metallic member occupying a 
predetermined area of the first member and having a predetermined depth in 
a direction from the first surface to the second surface of the member; 
and a plurality of second metallic members formed in the member for 
connecting wire to the integrated chip. 
The above and other advantages of the present invention are achieved also 
in part by a package, comprising: a) a plate having first and second 
surfaces, the plate having i) a metallic member formed in the first 
member, the first metallic member occupying a predetermined area of the 
plate; ii) a plurality of leads formed in the plate; b) an integrated chip 
mounted to the metallic member; c) a plurality of wires for connecting the 
plurality of leads to the integrated chip; and d) means for encapsulating 
a predetermined portion of the plate. 
Additional advantages, objects and other features of the invention will be 
set forth in part in the description which follows and in part will become 
apparent to those having ordinary skill in the art upon examination of the 
following or may be learned from practice of the invention. The objects 
and advantages of the invention may be realized and attained as 
particularly pointed out in the appended claims.

BEST MODE FOR CARRYING OUT THE INVENTION 
An improved plate and column type semiconductor package has a heat sink 
which is capable of more easily emitting heat generated in the interior of 
a semiconductor package. The semiconductor package enhances productivity 
by fabricating a semiconductor package using a unit column frame within 
which a plurality of leads and a heat sink are embedded. The plate type 
package body is sliced from the unit column frame at a regular interval. 
FIGS. 2A and 2B show a unit column frame and a sliced plate in accordance 
with the present invention. As shown therein, the unit column frame 10 
includes a column-shaped body 11 having a predetermined length (l), and a 
column-shaped heat sink 13 embedded within the center portion of the body 
11, and a plurality of leads 12 which are arranged at a periphery of the 
heat sink 13. The heat sink 13 is exposed to the upper and lower surfaces 
of the body 11, and a predetermined portion of the lead 12 is exposed to 
the surface of the body 11 by a predetermined thickness (d). In the 
drawing, one-dot-one-dash line denotes a cut-away portion of the body 11. 
The column-type body 11 is generally made of an insulation material. The 
column-type body 11 is made in a square shape or other appropriate shape, 
e.g., circular. As can be appreciate, other shapes can be adapted to the 
present invention. The unit column frame 10 is sliced at a desired 
interval (thickness), for example, by 1 mm, 1.5 mm, or 2.0 mm. The sliced 
unit column frame 10 becomes a plate, which is used for fabricating a 
semiconductor package. A plurality of leads 12 embedded within the unit 
column frame 10 may be embedded within the unit column frame 10. The upper 
and lower portions of the leads 12 and the heat sink 13 are exposed to the 
body 11. 
FIG. 3 shows a plate-shaped semiconductor package having a heat sink 
according to a first embodiment of the present invention. As shown 
therein, a semiconductor chip 15 is mounted on the heat sink 13, and a 
semiconductor chip 15 and a plurality of leads 12 are electrically bonded 
to each other using the metal wire 14. The reference numeral 16 denotes a 
molding line. The upper portion of the plate 11b is sealed by 
encapsulation and hardening of an epoxy molding compound (not shown). 
FIG. 4 shows a plate-shaped semiconductor package having a heat sink 
according to a second embodiment of the present invention. As shown 
therein, a groove 11a is formed by grinding or polishing a predetermined 
upper portion of the plate 11b which is sliced from the unit column frame 
10. Thereafter, a semiconductor mounting process, and a wire bonding 
process, which are described in the previous embodiment, are conducted. 
The groove 11a is encapsulated using an epoxy molding compound 17, thus 
forming a semiconductor package, whereby it is possible to fabricate a 
thinner semiconductor package as compared to the first embodiment of the 
present invention. 
FIG. 5 shows a plate-shaped semiconductor package having a heat sink 
according to a third embodiment of the present invention. A cover 11c is 
used instead of the epoxy molding compound of the previous embodiment of 
the present invention. The cover lic is obtained by slicing the unit 
column frame 10. A certain difference between the plate 11b and the cover 
11c exists in their respective thickness. 
In addition, as another embodiment of the present invention, the unit 
column frame may be attached to the lower surface of the pattern of the 
substrate in a column shape (not shown), or as another embodiment of the 
present invention, the lower surface of the unit column frame may be 
directly attached to the lower surface of the printed circuit board. 
After the semiconductor package having the abovementioned construction is 
mounted on the printed circuit board, when voltage is supplied to the 
semiconductor package, the semiconductor chip of the semiconductor package 
is operated, thus reading and writing a predetermined information in the 
chip. 
A plate having a heat sink and a column type semiconductor package of the 
present invention prevents a bending of leads. In addition, it is possible 
to more easily mount the chip on the substrate since a plurality of leads 
and the upper and lower surfaces of the plate- or column-shaped 
semiconductor package are exposed. In addition, lamination type structure 
is possible, so that the maintenance is easy. 
Since the heat sink is exposed to the upper and lower surfaces of the 
plate- or column-shaped semiconductor package, heat from the interior of 
the package can be more effectively emitted to the outside, and thus 
reducing malfunctions of the chip. The fabrication process and cost can be 
reduced, and productivity is increased, as compared to the conventional 
semiconductor package fabrication process. 
Although the preferred embodiments of the present invention have been 
disclosed for illustrative purposes, those skilled in the art will 
appreciate that various modifications, additions and substitutions are 
possible, without departing from the scope and spirit of the invention as 
described in the accompanying claims. 
The foregoing embodiment is merely exemplary and not to be construed as 
limiting the present invention. The present invention can be readily 
applied to other type of semiconductor packages. One of ordinary skill in 
the art can use the teachings of the present invention to other devices 
requiring easier and smaller fabrication of semiconductor packages. The 
description of the present invention is intended to be illustrative, and 
not limiting the scope of the claims. Many alternatives, modifications and 
variations will be apparent to those skilled in the art.