High frequency bga connector

Patent metadata

Field	Value
Publication number	US-2018317335-A1
Application number	US-201815964246-A
Country	US
Kind code	A1
Filing date	Apr 27, 2018
Priority date	Apr 28, 2017
Publication date	Nov 1, 2018
Grant date	—

Abstract

A connector for surface mounting with a solder reflow process with closely-spaced solder masses on mounting ends of reference contacts. The solder masses on the reference contacts may fuse for enhanced shielding. The mounting ends of signal and reference contacts may be positioned in rows, configured such that the solder masses of the reference contacts may shield solder masses attached to signal contacts in adjacent rows. The mounting ends of the signal contacts may be disposed in pockets in a surface of the connector housing. In some embodiments, solder balls may be fused to an edge of the signal contact, with the length of the edge extending beyond locations at which the solder ball is fused to. The edge may extend through a wall of the pocket, so as to set a desired impedance in the mounting region of the connector.

First claim

What is claimed is:

1 . A connector having a housing with a surface, wherein the connector is configured for attachment to a circuit board with the surface facing the circuit board, the connector comprising:
a plurality of pockets in the surface; and a plurality of contacts held by the housing, each of the plurality of contacts comprising a mating end, a mounting end opposite the mating end and disposed within at least a respective one of the plurality of pockets, and an intermediate portion that extends between the mating end and the mounting end; wherein:
the plurality of pockets are arranged in a plurality of rows;
within each row, a first portion of the pockets have a center-to-center spacing in a row direction from adjacent pockets of a first distance, and a second portion of the pockets have a center-to-center spacing in the row direction from at least one adjacent pocket of a second distance; and
the second distance is less than the first distance.

2 . The connector as recited in claim 1 , wherein the plurality of pockets comprise a rhombus region having a diagonal aligned with the row direction.

3 . The connector as recited in claim 1 , wherein the pockets of the first portion comprise a first region and a second region, the second region comprising a slot that extends from the first region towards an adjacent pocket in the second portion.

4 . The connector as recited in claim 3 , wherein the first region is rhombus.

5 . The connector in claim 1 , further comprising:
a plurality of solder balls extending into respective pockets of the plurality of pockets and fused to mounting ends within the pockets.

6 . The connector of claim 1 , wherein:
the connector further comprises a plurality of solder masses fused to mounting ends within the pockets; and each of the solder masses fused to the mounting ends in the pockets of the second portion is fused to a solder mass fused to a mounting end in at least one adjacent pocket of the second portion.

7 . The connector of claim 6 , further comprising:
a plurality of solder balls fused to respective mounting ends in the pockets of the first portion.

8 . The connector of claim 1 , wherein:
the pockets of the plurality of pockets within each row are offset relative to corresponding pockets in adjacent rows such that the pockets of the second portion in each row are offset, in the row direction, toward pockets of the first portion in an adjacent row.

9 . The connector of claim 1 , wherein, in each row of the plurality of rows, the pockets are arranged with pairs of pockets of the first portion, with each pair separated from an adjacent pair, by a plurality of pockets of the second portion.

10 . The connector as recited in claim 9 , wherein each pair of the first portion is separated from an adjacent pair by two pockets of the second portion.

11 . The connector as recited in claim 9 , wherein each pair of the first portion is separated from an adjacent pair by three pockets of the second portion.

12 . The connector as recited in claim 1 , wherein:
the plurality of rows comprise rows of a first row type and a second row type; rows of the first row type and the second row type are arranged alternatively; and rows of the second row type offset in the row direction from rows of the first row type by a third distance.

13 . An electrical assembly comprising:
a printed circuit board comprising a surface with a plurality of contact pads disposed thereon; a connector comprising a plurality of contacts; and a plurality of solder masses comprising a first type and a second type disposed in a plurality of parallel rows extending in a row direction, each of the plurality of solder masses having a height perpendicular to the surface of the printed circuit board, a width, and a length in the row direction, the length being a multiple of the width, wherein:
the length of a first type of the plurality of solder masses is less than the length of a second type, and
each of the plurality of solder masses is fused to a contact pad of the printed circuit board and a contact of the connector.

14 . The electrical assembly as recited in claim 13 , wherein each of the second type of the plurality of solder masses equal to a combined mass of a plurality of first type solder masses.

15 . The electrical assembly as recited in claim 13 , wherein the connector further comprises a housing with a surface, wherein the connector is configured for attachment to the printed circuit board with the surface of the housing facing the printed circuit board.

16 . The electrical assembly as recited in claim 15 , wherein the housing comprises a plurality of pockets in the surface, wherein:
the plurality of pockets are arranged in a plurality of rows; within each row, a first portion of the pockets have a center-to-center spacing in a row direction from adjacent pockets of a first distance, and a second portion of the pockets have a center-to-center spacing from at least one adjacent pocket of a second distance; and the second distance is less than the first distance.

17 . The electrical assembly as recited in claim 15 , wherein:
each of the plurality of contacts of the connector comprises a mating end, a mounting end opposite the mating end, and an intermediate portion that extends between the mating and the mounting end; the mounting ends extend from the housing adjacent the surface of the housing; and the mounting end of each of the plurality of contacts comprises first and second projections separated by a space.

18 . The electrical assembly as recited in claim 17 , wherein:
the plurality of contacts comprise a first type and a second type; the second projection of each first type contact is wider than the first projection of each first type contact; each of the second type contacts is wider than each of the first type contacts along the first direction; and the mounting end of each second type contact comprises at least four projections.

19 . The electrical assembly as recited in claim 18 , wherein:
the housing comprises a plurality of pockets in the surface, the pockets comprising a plurality of first type pockets and a plurality of second type pockets; each first type pocket receives a mounting end of a first type contact and a first type solder mass; each second type pocket receives a portion of a mounting end of a second type contact and a portion of a second type solder mass; and a center-to-center space between a first type pocket and an adjacent pocket of the plurality of pockets is greater than the center-to-center spacing between a second type pocket and an adjacent second type pocket of the plurality of pockets.

20 . The electrical assembly of claim 13 , wherein:
the printed circuit board comprises signal traces and reference planes connected to contact pads of the plurality of contact pads; solder masses of the first type are fused to contact pads connected to signal traces; and solder masses of the second type are fused to contact pads connected to reference planes.

21 . The electrical assembly as recited in claim 16 , wherein:
The pockets of the plurality of pockets within each row are offset relative to corresponding pockets in adjacent rows such that the pockets of the second portion in each row are offset, in the row direction, toward pockets of the first portion in an adjacent row.

22 . A method of manufacturing a connector comprising a plurality of contac

Assignees

• Fci Usa Llc

Inventors

• Rengarajan Madhumitha
• Johnson Lewis Robin

Classifications

• H10W90/701

  characterised by the relative positions of pads or connectors relative to package parts · CPC title

• H01R12/57

  surface mounting terminals · CPC title

• H01R43/0256

  for soldering or welding connectors to a printed circuit board · CPC title

• H05K7/1053 Primary

  having interior leads · CPC title

• H01R12/737

  Printed circuits being substantially perpendicular to each other (for printed connections H05K3/366) · CPC title