Method for stacking electronic components

Patent metadata

Field	Value
Publication number	US-9847175-B2
Application number	US-201414152389-A
Country	US
Kind code	B2
Filing date	Jan 10, 2014
Priority date	Jun 26, 2012
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A method of forming a stacked electronic component, and an electronic component formed by the method wherein the method includes:
providing a multiplicity of electronic components wherein each electronic component comprises a first external termination and a second external termination; providing a first lead frame plate and a second lead frame plate wherein the first lead frame plate and the second lead frame plate comprises barbs and leads; providing a molded case comprising a cavity and a bottom; and forming a sandwich of electronic components in an array between the first lead frame plate and the second lead frame plate with the barbs protruding towards the electronic components and the leads extending through the bottom.

First claim

The invention claimed is:

1. A method of forming a stacked electronic component comprising:
providing a multiplicity of electronic components wherein each electronic component of said electronic components comprises a first external termination and a second external termination;
providing a first lead frame plate and a second lead frame plate wherein said first lead frame plate and said second lead frame plate comprises barbs and leads;
providing a molded case comprising a cavity and an integral bottom;
and

forming a sandwich of said electronic components in an array between said first lead frame plate and said second lead frame plate with said barbs protruding towards said electronic components; and
inserting said sandwich into said molded case with said leads extending through said integral bottom wherein said leads penetrate said integral bottom of said molded case during said inserting and extend there through.

2. The method of forming a stacked electronic component of claim 1 further comprising:
forming said array of said electronic components prior to said forming of said sandwich.

3. The method of forming a stacked electronic component of claim 1 further comprising:
inserting at least one of said first lead frame plate and said second lead frame plate in said cavity prior to forming said sandwich.

4. The method of forming a stacked electronic component of claim 1 further comprising:
forming said sandwich of said electronic components in said array between said first lead frame plate and said second lead frame plate with said barbs protruding towards said electronic components; and
inserting said sandwich into said cavity wherein said leads extend through said bottom.

5. The method of forming a stacked electronic component of claim 1 wherein at least one said electronic component is a multilayered ceramic capacitor.

6. The method of forming a stacked electronic component of claim 5 wherein said multilayered ceramic capacitor is terminated with at least one material selected from copper film, plated nickel and plated gold.

7. The method of forming a stacked electronic component of claim 5 wherein said multilayered ceramic capacitor comprises a base metal electrode.

8. The method of forming a stacked electronic component of claim 7 wherein said base metal electrode comprises at least one material selected from the group consisting of nickel, copper, titanium, tungsten and molybdenum.

9. The method of forming a stacked electronic component of claim 5 wherein said multilayered ceramic capacitor comprises a precious metal electrode.

10. The method of forming a stacked electronic component of claim 9 wherein said precious metal electrode comprises a material selected from the group consisting of silver, palladium, gold and platinum.

11. The method of forming a stacked electronic component of claim 5 wherein each said electronic component is a multilayered ceramic capacitor.

12. The method of forming a stacked electronic component of claim 5 wherein at least one said electronic component is selected from a group consisting of resistors, thermistors, inductors, fuses, diodes, and varistors.

13. The method of forming a stacked electronic component of claim 5 wherein said multilayered ceramic capacitor comprises a dielectric selected from the group consisting of calcium-zirconate dielectrics or calcium-strontium-zirconate-titanate dielectrics or barium titanate.

14. The method of forming a stacked electronic component of claim 5 wherein said multilayered ceramic capacitor has a length of at least 1 mm to no more than 100 mm.

15. The method of forming a stacked electronic component of claim 14 wherein said multilayered ceramic capacitor has a length of at least 3 to no more than 20 mm.

16. The method of forming a stacked electronic component of claim 1 wherein said sandwich does not comprise an adhesive between said electronic component and said first lead frame plate.

17. The method of forming a stacked electronic component of claim 1 further comprising forming a sintered silver undercoat on said lead frame plate.

18. The method of forming a stacked electronic component of claim 1 wherein said lead frame plates are coated with a nickel barrier layer and a gold, Pd/Ag, Ag plating layer.

19. The method of forming a stacked electronic component of claim 1 wherein said first lead frame plate comprises a material selected from the group consisting of nickel iron alloys, phosphor bronze alloys and beryllium copper alloys.

20. The method of forming a stacked electronic component of claim 1 wherein said first lead frame plate has a thickness of between 0.1 mm-0.6 mm.

21. The method of forming a stacked electronic component of claim 1 wherein said barbs protrude at least 0.1 to no more than 0.8 mm.

22. The method of forming a stacked electronic component of claim 1 wherein said barbs are at an 5°-30° inward bend angle sloping in a downward direction towards said leads.

23. The method of forming a stacked electronic component of claim 1 wherein said molded case comprises a material selected from the group consisting of polyimide, polysulfone, FR4, ceramic or glass.

24. The method of forming a stacked electronic component of claim 1 wherein said molded case comprises a material with a Tg of greater than 175° C.

25. The method of forming a stacked electronic component of claim 1 wherein said molded case has a wall thickness of at least 1.0 mm to no more than 10 mm.

26. The method of forming a stacked electronic component of claim 25 wherein said molded case has a wall thickness of no more than 4.0 mm.

27. The method of forming a stacked electronic component of claim 1 comprising no more than 320 of said electronic components.

28. The method of forming a stacked electronic component of claim 1 wherein said molded case further comprises internal dividers in said cavity.

29. The method of forming a stacked electronic component of claim 1 further comprising adding a cover over said molded case to fully encapsulate said electronic components.

30. A method of forming an electronic device comprising:
forming a stacked electronic component by the method of;
providing a multiplicity of electronic components wherein each electronic component of said electronic components comprises a first external termination and a second external termination;
providing a first lead frame plate and a second lead frame plate wherein said first lead frame plate and said second lead frame plate comprises barbs and leads;
providing a molded case comprising a cavity and an integral bottom; and
forming a sandwich of said electronic components in an array between said first lead frame plate and said second lead frame plate with said barbs protruding towards said electronic components; and
inserting said sandwich into said molded case with said leads extending through said integral bottom wherein said leads penetrate said integral bottom of said molded case during said inserting and extend there through;
placing said stacked electronic component on a circuit board; and
passing said circuit board through an IR reflow oven, or IR/convection reflow oven, or a convection oven, or exposed to hot bar reflow or flame reflow heat sufficient to melt the low temperature metal to enhance the electrical connection of the device.

Assignees

• Kemet Electronics Corp

Inventors

• Perea Maurice
• Hill R Allen
• Phillips Reggie

Classifications

• H01G4/30 Primary

  Stacked capacitors (H01G4/33 takes precedence) · CPC title

• Y10T29/43

  Electric condenser making · CPC title

• H01C1/014

  the resistor being suspended between and being supported by two supporting sections (H01C1/016 takes precedence) · CPC title

• H01G4/232

  electrically connecting two or more layers of a stacked or rolled capacitor · CPC title

• H01C1/14

  Terminals or tapping points specially adapted for resistors; Arrangements of terminals or tapping points on resistors · CPC title