Die down multi-media card and method of making same

• US 6,910,635 B1
• Filed: 10/08/2002
• Issued: 06/28/2005
• Est. Priority Date: 10/08/2002
• Status: Active Grant

• Current Assignee: Amkor Technology Singapore Holding Pte., Ltd. (Amkor Technology Incorporated)
• Original Assignee: Amkor Technology Incorporated
• Inventors: Miks, Jeffrey Alan, Miranda, John A.
• Primary Examiner(s): Frech, Karl D.
• Application Number:
  US10/266,329
• Time in Patent Office: 994 Days
• Field of Search: 235/487, 235/488, 235/492
• US Class Current: 235/487
• CPC Class Codes: G06K 19/077 Constructional details, e.g. mounting of circuits in the carrier
• CPC Class Codes: G06K 19/07732 the record carrier having a housing or construction similar to well-known portable memory devices, such as SD cards, USB or memory sticks housings for electrical equipment in general, see H05K5/02
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding

Abstract

A circuit module comprising a leadframe having at least one die pad, a plurality of contacts, and a plurality of conductive traces extending from respective ones of the contacts toward the die pad. The traces are bent in a manner wherein the die pad and the contacts extend along respective ones of spaced, generally parallel frame planes. Attached to the die pad is a semiconductor die which extends along a die plane disposed between and generally parallel to the frame planes. The semiconductor die is electrically connected to at least one of the traces. A body at least partially encapsulates the leadframe and the semiconductor die such that the die pad is exposed within a top surface defined by the body and the contacts are exposed within a bottom surface defined by the body.

Claims

1. A circuit module comprising:

a leadframe having;

at least one die pad;

a plurality of contacts; and

a plurality of conductive traces extending from respective ones of the contacts toward the die pad;

the traces being bent in a manner wherein the die pad and the contacts extend along respective ones of spaced, generally parallel frame planes;

a semiconductor die attached to the die pad such that the semiconductor die extends along a die plane which is disposed between and generally parallel to the frame planes, the semiconductor die being electrically connected to at least one of the traces; and

a body at least partially encapsulating the leadframe and the semiconductor die such that the die pad is exposed within a top surface defined by the body and the contacts are exposed within a bottom surface defined by the body.

2. The circuit module of claim 1 wherein:

each of the traces includes a bond pad formed thereon; and

a plurality of conductive wires are used to electrically connect the semiconductor die to respective ones of the bond pads.

3. The circuit module of claim 1 wherein:

the die pad defines opposed, generally planar top and bottom surfaces;

each of the contacts defines opposed, generally planar top and bottom surfaces;

the semiconductor die is attached to the bottom surface of the die pad;

the top surface of the die pad is exposed within and substantially flush with the top surface of the body; and

the bottom surfaces of the contacts are exposed within and substantially flush with the bottom surface of the body.

4. The circuit module of claim 3 further in combination with a skin attached to the body in a manner covering the top surface thereof and the top surface of the die pad.

5. The circuit module of claim 1 wherein each of the traces defines a sloped portion extending between the die pad and the contacts.

6. A memory card comprising:

a leadframe having;

at least one die pad;

a plurality of contacts; and

a plurality of conductive traces extending from respective ones of the contacts toward the die pad;

the traces being bent in a manner wherein the die pad and the contacts extend along respective ones of spaced, generally parallel frame planes;

a semiconductor die attached to the die pad such that the semiconductor die extends along a die plane which is disposed between and generally parallel to the frame planes, the semiconductor die being electrically connected to at least one of the traces; and

a body at least partially encapsulating the leadframe and the semiconductor die such that the contacts are exposed within a bottom surface defined by the body.

7. The memory card of claim 6 wherein:

each of the traces includes a bond pad formed thereon; and

a plurality of conductive wires are used to electrically connect the semiconductor die to respective ones of the bond pads.

8. The memory card of claim 6 wherein:

the die pad defines opposed, generally planar top and bottom surfaces;

each of the contacts defines opposed, generally planar top and bottom surfaces;

the semiconductor die is attached to the bottom surface of the die pad; and

the bottom surface of the contacts are exposed within and substantially flush with the bottom surface of the body.

9. The circuit module of claim 6 wherein each of the traces defines a sloped portion extending between the die pad and the contacts.

10. A method of fabricating a circuit module, comprising the steps of:

a) providing a leadframe having at least one die pad, a plurality of contacts, and a plurality of conductive traces extending from respective ones of the contacts toward the die pad;

b) bending the traces in a manner wherein the die pad and the contacts extend along respective ones of spaced, generally parallel frame planes;

c) attaching a semiconductor die to the die pad such that the semiconductor die extends along a die plane which is disposed between and generally parallel to the frame planes;

d) electrically connecting the semiconductor die to at least one of the traces; and

e) partially encapsulating the leadframe and the semiconductor die with a body such that the die pad is exposed within a top surface defined by the body and the contacts are exposed within a bottom surface defined by the body.

11. The method of claim 10 wherein:

step (a) comprises providing a leadframe wherein each of the traces includes a bond pad formed thereon; and

step (d) comprises electrically connecting the semiconductor die to respective ones of the bond pads through the use of a plurality of conductive wires.

12. The method of claim 10 wherein:

step (a) comprises providing a leadframe wherein the die pad defines opposed, generally planar top and bottom surfaces and each of the contacts defines opposed, generally planar top and bottom surfaces;

step (c) comprises attaching the semiconductor die to the bottom surface of the die pad; and

step (e) comprises forming the body such that the top surface of the die pad is exposed within and substantially flush with the top surface thereof, and the bottom surfaces of the contacts are exposed within and substantially flush with the bottom surface thereof.

13. The method of claim 12 further comprising the step of:

f) attaching a skin to the body in a manner wherein the skin covers the top surface of the body and the top surface of the die pad.

14. The method of claim 10 wherein step (b) comprises bending each of the traces to define a sloped portion extending between the die pad and the contacts.

15. The method of claim 10 wherein:

step (a) comprises providing a leadframe wherein each of the contacts is connected to a dambar of the leadframe; and

step (e) comprises forming the body such that the dambar protrudes therefrom.

16. The method of claim 15 further comprising the step of:

f) removing the dambar from the leadframe to facilitate the electrical isolation of the contacts from each other.

17. The method of claim 10 wherein step (e) is completed through the implementation of a molding process selected from the group consisting of:

injection molding;

resin transfer molding;

infusion molding; and

reaction injection molding.

18. A method of fabricating a memory card, comprising the steps of:

a) providing a leadframe having at least one die pad, a plurality of contacts, and a plurality of conductive traces extending from respective ones of the contacts toward the die pad;

b) bending the traces in a manner wherein the die pad and the contacts extend along respective ones of spaced, generally parallel frame planes;

c) attaching a semiconductor die to the die pad such that the semiconductor die extends along a die plane which is disposed between and generally parallel to the frame planes;

d) electrically connecting the semiconductor die to at least one of the traces; and

e) partially encapsulating the leadframe and the semiconductor die with a body such that the contacts are exposed within a bottom surface defined by the body.

19. The method of claim 18 wherein:

step (a) comprises providing a leadframe wherein each of the traces includes a bond pad formed thereon; and

step (d) comprises electrically connecting the semiconductor die to respective ones of the bond pads through the use of a plurality of conductive wires.

20. The method of claim 18 wherein:

step (a) comprises providing a leadframe wherein the die pad defines opposed, generally planar top and bottom surfaces and each of the contacts defines opposed, generally planar top and bottom surfaces;

step (c) comprises attaching the semiconductor die to the bottom surface of the die pad; and

step (e) comprises forming the body such that the bottom surfaces of the contacts are exposed within and substantially flush with the bottom surface thereof.

21. The method of claim 18 wherein step (b) comprises bending each of the traces to define a sloped portion extending between the die pad and the contacts.

22. The method of claim 18 wherein:

step (a) comprises providing a leadframe wherein each of the contacts is connected to a dambar of the leadframe; and

step (e) comprises forming the body such that the dambar protrudes therefrom.

23. The method of claim 22 further comprising the step of:

f) removing the dambar from the leadframe to facilitate the electrical isolation of the contacts from each other.

24. The method of claim 18 wherein step (e) is completed through the implementation of a molding process selected from the group consisting of:

injection molding;

resin transfer molding;

infusion molding; and

reaction injection molding.

25. A method of fabricating a memory card, comprising the steps of:

a) providing a circuit module which comprises a substrate having a plurality of contacts, and a semiconductor die which is attached to the substrate and electrically connected to the contacts;

b) placing the circuit module into a mold cavity having a prescribed form factor; and

c) injecting a polymeric material into the mold cavity and around the circuit module in a manner wherein at least a portion of each of the contacts is not covered by the polymeric material.

26. The method of claim 25 wherein step (b) comprises forming the mold cavity to have a form factor selected from the group consisting of:

a multi-media card form factor;

a secure digital card form factor; and

a compact flash card form factor.