Method of forming a leaded molded array package
View Patent ↗In one embodiment, a method for forming a leaded molded array package includes placing a lead frame assembly into a molding apparatus having lead cavities. The method further includes forming seals between conductive leads within the lead frame assembly and the lead cavities, and encapsulating the lead frame assembly to form a molded array assembly. The molded array assembly is then separated into individual leaded molded packages.
1. A method for forming leaded molded array package devices comprising the steps of
providing a lead frame assembly having a plurality of flag portions, a plurality of leads in spaced relationship with the plurality of flag portions, and a plurality of electronic chips attached to the plurality of flag portions and electrically coupled to the plurality of conductive leads, wherein the lead frame assembly is independent of dam-bars;
placing the lead frame assembly into a molding apparatus that includes lead cavities shaped to form seals with the plurality of leads;
forming seals with the plurality of leads and the lead cavities;
encapsulating the lead frame assembly with an encapsulating material, wherein the seals prevent the encapsulating material from flowing between leads to form a molded array assembly; and
singulating the molded array assembly to form the leaded molded array packages, wherein the leaded molded array packages have leads extending outwardly from sides of the leaded molded array packages.
2. The method of claim 1 wherein the step of providing the lead frame assembly includes providing the lead frame assembly wherein the flag portions and the plurality of leads are substantially co-planar.
3. The method of claim 1 wherein the step of providing the lead frame assembly includes providing the lead frame assembly wherein the flag portions are offset a distance from the plurality of leads.
4. The method of claim 1 wherein the step of placing the lead frame assembly into the molding apparatus includes placing the lead frame assembly into a molding apparatus having a bottom mold die with a cavity and the lead cavities, wherein the placing step further includes placing the lead frame assembly into the bottom mold die so that the electronic chips are within the cavity of the bottom mold die.
5. The method of claim 1 wherein the step of placing the lead frame assembly into the molding apparatus includes placing the lead frame assembly into a molding apparatus having a bottom mold die having a single bottom cavity and a mold plate having a mold cavity and the lead cavities, and wherein the placing step further includes placing the lead frame assembly so that an electronic chip is within the mold cavity.
6. The method of claim 5 wherein the step of providing the lead frame assembly includes providing a lead frame assembly having leads on all sides of an electronic chip.
7. The method of claim 1 wherein the step of singulating includes separating the molded array assembly through portions of the plurality of flags and the plurality of leads.
8. The method of claim 1 wherein the step of placing the lead frame assembly into the molding apparatus includes placing the lead frame assembly into the molding apparatus, wherein the lead cavities include tapered portions having widths less than widths of the plurality of leads.
9. The method of claim 1 further comprising the step of forming the leads to provide a desired shape.
10. A process for forming molded packages including the steps of:
providing a lead frame assembly having conductive leads, wherein the lead frame assembly is absent mold dam-bars;
placing the lead frame assembly into a molding apparatus having tapered lead cavities, wherein a conductive lead is placed in spaced relationship with a tapered lead cavity;
forming a seal between the tapered lead cavity and the conductive lead;
encapsulating the lead frame assembly whereby the seal prevents flow of encapsulating material between adjacent conductive leads to form a molded lead frame assembly; and
separating the molded lead frame assembly thereby forming individual leaded molded packages.
11. The process of claim 10 wherein the step of placing the lead frame assembly into the molding apparatus includes placing the lead frame assembly into a molding apparatus having a bottom mold die with the tapered lead cavities.
12. The process of claim 10 wherein the step of placing the lead frame assembly into the molding apparatus includes placing the lead frame assembly into a molding apparatus having a mold plate with the tapered lead cavities.
13. The process of claim 10 wherein the step of providing the lead frame assembly includes providing a lead frame assembly having flag portions substantially co-planar with the conductive leads.
14. The process of claim 10 wherein the step of providing the lead frame assembly includes providing the lead frame assembly having flag portions that are offset a distance from the conductive leads.