Chip card module
In various aspects of the disclosure, a chip card module is provided. The chip card module may include a flexible substrate having a metallization on a first and second major surface, or side, thereof. An integrated circuit affixed to the second side is oriented with chip pads facing away from the substrate. Wire bonds may connect the chip pads to the metallizations.
1. A chip card module comprising:
a flexible substrate having a first and second major surface;
a first metallization on said first major surface providing at least one discreet electrical contact area;
a second metallization on said second major surface forming at least one discreet electrical lead;
at least one via establishing electrical contact between said first metallization and said second metallization;
a device mounted to said second major surface, the device having at least one electrical contact pad disposed thereon, said contact pad facing away from the second major surface; and
at least one bond wire electrically connecting said contact to said electrical lead.
2. The chip card module of claim 1 , wherein said flexible substrate is formed of at least in part of polyester.
3. The chip card module of claim 2 , wherein said bond wire is formed at least in part of aluminum.
4. The chip card module of claim 3 , wherein said electrical contact area is provided at least in part without any gold.
5. The chip card module of claim 4 wherein said integrated circuit comprises a plurality of contact pads oriented in a first plane, and wherein said second metallization comprises a plurality of electrical leads oriented in a second plane, the first and second planes being oriented within 10 degrees of parallel to each other.
6. The chip card of claim 5 wherein an encapsulation is provided covering said plurality of bond wires.
7. The chip card module of claim 6 wherein a distance between one of said plurality of contact pads and one of said at least one via defines a lead radius and wherein said encapsulation is defined by a radius less than that of the lead radius.
8. The chip card module of claim 2 wherein said device is an integrated circuit.
9. The chip card module of claim 1 wherein said substrate has a melting point less than 260 degrees Celsius.
10. The chip card module of claim 9 wherein said substrate has a melting point less than 200 degrees Celsius.
11. A method for manufacturing a chip card module comprising:
depositing a first metallization on a first major surface of a flexible substrate;
depositing a second metallization on a second major surface of the substrate;
establishing electrical contact between the first and second metallization;
affixing an integrated circuit on the second major surface of the flexible substrate, the integrated circuit having a plurality of chip pads facing away from said second major surface; and
bonding wire between the chip pads and the second metallization.
12. The method of claim 11 further comprising encapsulating the bonded wire.
13. The method of claim 12 wherein at least one of the plurality of chip pads is oriented in a plane less than 10 degrees from parallel with the second major surface.
14. The method of claim 13 wherein said bonding takes place at less than 150 degrees Celsius.
15. The method of claim 14 wherein said bonding takes place without rotating head technology.
16. The method of claim 14 wherein the substrate is polyester.