Method of marking a low profile packaged semiconductor device
View Patent ↗A semiconductor device ( 10 ) is made by mounting the bottom surfaces ( 31, 44, 54 ) of a semiconductor die ( 14 ) and a lead ( 15, 17 ) on a tape ( 12 ) and over a hole ( 19 ) in the tape. A vacuum is drawn through the hole to secure the die in place when the lead's top surface ( 43 ) is wirebonded to a top surface ( 32 ) of the semiconductor die. A molding material ( 49 ) is formed to encapsulate the top surface of the semiconductor die and to expose its bottom surface.
1. A method of making a semiconductor device, comprising:
providing a semiconductor die having first and second opposed surfaces, wherein the semiconductor die has a solderable metal layer formed overlying the second surface;
providing a tape having an adhesive surface and a hole extending completely through the tape;
mounting the semiconductor die on the adhesive surface of the tape, wherein the semiconductor die covers the hole and a portion of the solderable metal layer is exposed through the hole;
drawing a vacuum through the hole to secure the semiconductor die;
attaching a wirebond to the first surface of the semiconductor die and to a lead disposed on the tape while drawing the vacuum;
forming an encapsulating layer overlying the wirebond, at least a portion of the lead and at least a portion of the semiconductor die while the tape is attached to the solderable metal layer; and
removing the tape so that surfaces of the lead and the solderable metal layer are exposed to provide package leads, wherein the exposed solderable metal layer provides an electrical contact for the semiconductor device when the semiconductor device is mounted to an electronic system.
2. The method of claim 1 , wherein the step of mounting the semiconductor die includes mounting the semiconductor die to a tape comprising metal foil having an adhesive material applied thereto.
3. The method of claim 1 , wherein the step of mounting the semiconductor die includes mounting the semiconductor die over a single hole in the tape.
4. The method of claim 1 , further comprising the step of singulating through the encapsulating layer and a portion of the lead to provide a packaged semiconductor device.
5. The method of claim 1 , further comprising the step of attaching a leadframe having at least one opening and including the lead to the adhesive surface of the tape, wherein the solderable metal layer and a surface of the lead are coplanar and wherein the semiconductor die is positioned in the opening of the leadframe.
6. A method of making a semiconductor device, comprising:
providing a tape having an adhesive surface and a hole extending completely through the tape;
mounting a leadframe having a conductive lead to the adhesive surface, wherein the leadframe has an opening surrounding the hole;
mounting a first surface of a semiconductor die to the adhesive surface so that the semiconductor die is within the opening and covers the hole, wherein the first surface comprises a solderable metal layer formed overlying the semiconductor die;
drawing a vacuum through the hole to secure the semiconductor die while attaching a first end of a bonding wire to a second surface of the semiconductor die and a second end of the bonding wire to the conductive lead;
encapsulating the bonding wire and the second surface of the semiconductor die and a second surface the conductive lead with an encapsulant;
exposing a first surface of the lead and the solderable metal through the encapsulant to provide package leads, wherein the solderable metal layer is configured as an electrical contact for semiconductor device when the semiconductor device is mounted to an electronic system; and
singulating through the encapsulant and a portion of the leadframe.
7. The method of claim 6 , wherein the step of mounting the semiconductor die includes mounting the semiconductor die so that a first surface of the lead is in a plane with the first surface of the semiconductor die, and wherein both first surfaces are adjacent the adhesive surface.
8. The method of claim 6 , the step of mounting the first surface of the semiconductor die includes mounting the first surface of the semiconductor die over only one hole in the tape.
9. The method of claim 6 , wherein the step of exposing includes covering the first surfaces of the semiconductor die and the conductive lead with the tape to block the encapsulant.
10. The method of claim 6 , wherein the step of providing the tape includes providing a tape comprising metal foil having an adhesive material applied thereto.