Method of manufacturing an opto-coupler

• US 7,112,457 B2
• Filed: 05/04/2005
• Issued: 09/26/2006
• Est. Priority Date: 08/14/2003
• Status: Expired due to Term

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Kek, Theng Hui, Tay, Gary Thiam Siew, Kwok, Ka Hin
• Primary Examiner(s): Zarneke, David A.
• Application Number:
  US11/121,368
• Publication Number:
  US 20050207697A1
• Time in Patent Office: 510 Days
• Field of Search: None
• US Class Current: 438/25
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 25/167 comprising optoelectronic devices, e.g. LED, photodiodes
• 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

Abstract

A method of manufacturing an opto-coupler includes disposing an insulating layer on a first die and disposing an isolation layer on the insulating layer. The method further includes disposing a securing layer on the isolation layer and disposing a second die on the securing layer.

Claims

1. A method of manufacturing an opto-coupler comprising:

providing a printed circuit board having conductors and vias, and providing a wafer having a plurality of first optically active dies thereon, each die having an active face and a second opposing face;

disposing a light transmissive insulating layer on each of the plurality of first optically active dies;

singulating the plurality of disposed first optically active dies from the wafer to provide a plurality of individual dies;

disposing, on the individual dies, a first light transmissive securing layer on the insulating layer;

disposing, on the individual dies, a light transmissive isolation layer on the first light transmissive securing layer;

disposing, on the individual dies, a second light transmissive securing layer on the light transmissive isolation layer, wherein the area of said isolation layer is greater than the area of an active face of said first optically active dies;

disposing, on the individual dies, a second optically active die having an active face, such that the active face is in direct contact with the second light transmissive securing layer, to form a stack; and

mechanically connecting the stack to the printed circuit board and electrically connecting the first and second dies to the conductors.

2. A method of manufacturing an opto-coupler according to claim 1, wherein the printed circuit board further comprises a plurality of adjoined locations for mechanically and electrically connecting the stacks, and further comprising a final step of separating each adjoined location from the adjoined other.

3. A method of manufacturing an opto-coupler according to claim 1, wherein the light transmissive insulating layer comprises a silicon dioxide, silicon nitride, or benzo cyclo butene insulating layer.

4. A method according to claim 1, further comprising a final step of forming a light transmissive guide over at least a portion of the first optically active die and at least a portion of the second optically active die for guiding a light signal between the first optically active die and the second optically active die.

5. A method of manufacturing an opto-coupler according to claim 1, wherein the first and second light transmissive securing layers comprises epoxy.

6. A method of manufacturing an opto-coupler according to claim 1, wherein the light transmissive isolation layer comprises polyimide or glass.

7. A method of manufacturing an opto-coupler according to claim 1, wherein the first optically active die is an optical transmitter and the second optically active die is an optical receiver.

8. A method of manufacturing an opto-coupler according to claim 1, wherein the first optically active die is an optical receiver and the second optically active die is an optical transmitter.

9. A method of manufacturing an opto-coupler, comprising:

providing a printed circuit board having conductors and vias, and providing a wafer having a plurality of first optically active dies thereon, each die having an active face and a second opposing face;

disposing a light transmissive insulating layer on each of the plurality of first optically active dies;

disposing a light transmissive isolation layer on the light transmissive insulating layer;

singulating the plurality of disposed first optically active dies from the wafer to provide a plurality of individual dies;

disposing, on the individual dies, a light transmissive securing layer on the insulating layer wherein the area of said insulating layer is greater than the area of an active face of said first optically active dies.

disposing, on the individual dies, a second optically active die having an active face, such that the active face is in direct contact with the light transmissive securing layer, to form a stack; and

mechanically connecting the stack to the printed circuit board and electrically connecting the first and second dies to the conductors.

10. A method of manufacturing an opto-coupler according to claim 9, wherein the printed circuit board further comprises a plurality of adjoined locations for mechanically and electrically connecting the stacks, and further comprising a final step of separating each adjoined location from the adjoined other.

11. A method of manufacturing an opto-coupler according to claim 9, wherein the light transmissive insulating layer comprises a silicon dioxide, silicon nitride, or benzo cyclo butene insulating layer.

12. A method according to claim 9, wherein the step of disposing an isolation layer on the insulating layer comprises spin-coating an isolation layer on the insulating layer after the insulating layer has been formed on the wafer.

13. A method according to claim 9, further comprising a final step of forming a light transmissive guide over at least a portion of the first optically active die and at least a portion of the second optically active die for guiding a light signal between the first optically active die and the second optically active die.

14. A method according to claim 9, further comprising encapsulating the first optically active die and the second optically active die with an encapsulant.

15. A method of manufacturing an opto-coupler according to claim 9, wherein the light transmissive securing layer comprises epoxy.

16. A method of manufacturing an opto-coupler according to claim 9, wherein the light transmissive isolation layer comprises polyimide.

17. A method of manufacturing an opto-coupler according to claim 9, wherein the first optically active die is an optical transmitter and the second optically active die is an optical receiver.

18. A method of manufacturing an opto-coupler according to claim 9, wherein the first optically active die is an optical receiver and the second optically active die is an optical transmitter.

19. A method of manufacturing an opto-coupler, comprising:

providing a printed circuit board having conductors and vias, and providing a wafer having a plurality of first optically active dies thereon, each die having an active face and a second opposing face;

disposing a light transmissive insulating layer on each of the plurality of first optically active dies;

singulating the plurality of disposed first optically active dies from the wafer to provide a plurality of individual dies;

connecting one or more of the individual dies to the printed circuit board by means of an electrically conductive adhesive;

disposing, on the individual dies, a first light transmissive securing layer on the insulating layer;

disposing, on the individual dies, a light transmissive isolation layer on the first light transmissive securing layer;

disposing, on the individual dies, a second light transmissive securing layer on the light transmissive isolation layer,wherein the area of said isolation layer is greater than the area of an active face of said first optically active dies.

disposing, on the individual dies, a second optically active die having an active face, such that the active face is in direct contact with the second light transmissive securing layer, to form a stack; and

electrically connecting the first and second dies to the conductors.

20. A method of manufacturing an opto-coupler according to claim 19, wherein the printed circuit board further comprises a plurality of adjoined locations for mechanically and electrically connecting the stacks, and further comprising a final step of separating each adjoined location from the adjoined other.