Electronic surface mount package with extended side retaining wall

• US 6,320,489 B1
• Filed: 11/24/1997
• Issued: 11/20/2001
• Est. Priority Date: 08/10/1995
• Status: Expired due to Term

• Current Assignee: Halo Electronics Incorporated
• Original Assignee: Halo Electronics Incorporated
• Inventors: Lu, Peter, Heaton, James W., Lam, Robert Loke Hang, Sun, Tsang Kei, Heaton, Jeffrey, Pao, Peter Loh Hang
• Primary Examiner(s): MAI, ANH T
• Application Number:
  US08/977,400
• Time in Patent Office: 1,457 Days
• Field of Search: 174/52.4, 174/50, 361/821, 361/752, 336/192, 336/229, 336/65, 336/96, 336/90
• US Class Current: 336/96
• CPC Class Codes: H01F 17/062 Toroidal core with turns of coil around it
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/005 Impregnating or encapsulating insulating of windings H01F41/12
• CPC Class Codes: H01F 41/10 Connecting leads to windings making electric connections in general H01R43/00
• CPC Class Codes: H01R 13/6461 Means for preventing cross-talk
• CPC Class Codes: H01R 13/6633 with inductive component, e.g. transformer
• CPC Class Codes: H01R 13/7193 with ferrite filters
• CPC Class Codes: H05K 3/301 by means of a mounting structure H05K3/325 takes precedence
• CPC Class Codes: H05K 3/3421 Leaded components

Abstract

The electronic surface mount package according to the present invention includes a one piece construction package having end walls, a side wall and an open bottom; a plurality of toroid transformers carried within the package by a soft silicone material wherein the toroid transformers each have wires wrapped thereon; a plurality of terminal pins molded within and extending from the bottom of the package wherein each of the pins extend through a bottom portion of the side wall and have a notched post upon which the wires from said transformers are wrapped and soldered thereon, respectively; and wherein the end walls have a first height H1 to form a standoff or safe guard between the foot seating plane of the package and the terminal pins; and wherein the outer portion of the side wall extends between the end walls such that the side wall has a second height H2 which is less than said first height H1. The extended side retaining wall provides for improved containment of the soft silicone material within the package. The extended side retaining wall also provides for improved coverage of the wire wrapped solder posts. In addition, since the height H2 of the extended side retaining wall is less than the height H1 of the safe guard, the mounting of the package onto a printed circuit board with the extended side retaining wall allows for cleaning of the PCB with wash liquids which can flow freely under the package under the portion of the extended side wall which is less in height than the height of the safeguard (H1<H2).

Claims

1. An electronic surface mount package for mounting onto the surface of a printed circuit board comprising:

a one piece construction package having end walls, a side wall and an open bottom,

a plurality of toroid transformers within said package by a soft silicone material, said toroid transformers each having wires wrapped thereon;

a plurality of terminal pins molded within and extending from the bottom of said package, each of said pins extending through a bottom portion of said side wall and below the inner portion of said side wall and having a notched solder post upon which said wires from said transformers are wrapped and soldered thereon, respectively;

said end walls having a first height Hi to form a standoff or safe guard between the surface of a printed circuit board and said terminal pins;

the outer portion of said side wall extending between said end walls and having a second height H2 which is less than said first height H1.

2. An electronic surface mount package for mounting onto the surface of a printed circuit board comprising:

a construction package having end walls, a side wall and an open bottom,

a plurality of toroid transformers within said package by a soft silicone material, said toroid transformers each having wires wrapped thereon,

a plurality of terminal pins molded within and extending from the bottom of said package, each of said pins extending through a bottom portion of said side wall and below the inner portion of said side wall and having notched solder posts upon which said wires from said transformers are wrapped and soldered thereon, respectively;

said end walls having a first height H1 to form a standoff or safe guard between the surface of a printed circuit board and said terminal pins;

the outer portion of said side wall extending between said end walls and having a second height H2 which is less than said first height H1.

3. A package as in claim 2 wherein said construction package is one piece.

4. The package of claim 3 wherein said posts are separated from one another so as to avoid arcing.

5. An electronic surface mount package for mounting onto the surface of a printed circuit board in an electronic device, said electronic surface mount package comprising:

a one piece construction package having end walls, a side wall and an open bottom,

a plurality of toroid transformers within said package by a soft silicone material, said toroid transformers each having wires wrapped thereon,

a plurality of terminal pins molded within and extending from the bottom of said package, each of said pins extending through a bottom portion of said side wall and below the inner portion of said side wall and having a notched solder post upon which said wires from said transformers are wrapped and soldered thereon, respectively,

said end walls having a first height H1 to form a standoff or safe guard between the surface of a printed circuit board and said terminal pins;

the outer portion of said side wall extending between said end walls and having a second height H2 which is less than said first height H1.

6. The package as in claim 5 further including a standoff for maintaining a distance between the bottom of said pins and said printed circuit board.

7. An electronic surface mount package for mounting onto the surface of a printed circuit board comprising:

a construction package having end walls, a side wall and an open bottom,

at least one toroid transformer within said package by a soft silicone material, said toroid transformer having a wire wrapped thereon,

at least one terminal pin molded within and extending from the bottom of said package, said pin extending through a bottom portion of said side wall and below the inner portion of said side wall and having a notched solder post upon which said wire from said transformer is wrapped and soldered thereon,

said end walls having a first height H1 to form a standoff or safe guard between the surface of a printed circuit board and said terminal pins;

the outer portion of said side wall extending between said end walls and having a second height H2 which is less than said first height H1.

8. An electronic surface mount package for mounting onto the surface of a printed circuit board in an electronic device, said package comprising:

a one piece open construction package having end walls, side walls and an open bottom,

a plurality of toroid transformers within said package, said toroid transformers each having a side wall and wires wound thereon,

a plurality of terminal pins molded within and extending through a bottom of said side wall and below the inner portion of said side wall, each of said pins having a hour-glass shaped notched solder post upon which said wires from said transformers are wrapped thereon, respectively,

said end walls having a first height Hi to form a standoff or safe guard between the surface of a printed circuit board and said terminal pins;

the outer portion of said side wall extending between said end walls and having a second height H2 which is less than said first height H1.