Hi Jeff: I have not soldered a component like you are trying to solder, thanks for sending me the drawing of the component. It is very unique. I have solder pipes many times. We flux the heck of the inside of the pipe and the outside of the mating pipe and insert them, heat them and at the same time feed solder to the joint. The flux bubbles to the outside of the joint. Meaning, part of it to the environment and part to the inner pipe environment but away from the pipes contacting surfaces. I have proven it by reheating the joint and pulling the pipes away from each other and seeing that both pipes are fully wetted and no signs of flux. Flux will form around BGA balls or PGA pins, but if it is a continuous joint such as this component's the flux should bubble out of it given the right profile. Regards, Ramon -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeff Brown Sent: Thursday, November 24, 2005 12:39 AM To: [log in to unmask] Subject: Re: [TN] Unusual soldering challenge Hi Zil, Unfortunately it's too late to revise the board this time, but I will pass your suggestion on for next time. Many thanks, Jeff -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Zilber Gil Sent: Wednesday, 23 November 2005 11:01 PM To: [log in to unmask] Subject: Re: [TN] Unusual soldering challenge Hello Jeff, We had similar components short time ago, and we create a grid in the aperture of the stencil, similar to what Ivan suggested. The reflow pass well, but after examine the component with X-ray we saw air trapped in the solder (about 20% of the area). Thus, I suggest designing the pad on the PCB the same way as the grid in the stencil. Regards, Gil Zilber Technologist, Elta system Ltd. Tel. +972-8-8577240 Mobile +972-54-4983222 http://www.iai.co.il/site/en/iai.asp?pi=17887 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Jeff Brown Sent: Tuesday, November 22, 2005 7:46 AM To: [log in to unmask] Subject: [TN] Unusual soldering challenge Hi Everyone, We have a problem with a fairly unique component that requires soldering to a PCB. I'm really hoping that someone has seen this before as it looking really awkward. The component is mounted on a piece of fiberglass about 25mm x 16mm. The footprint consists of a ground pad which takes up 95% of the area, and four signal pads with 0.5mm clearance from the ground pad. The manufacturer recommends a grid of stenciled paste for the ground pad due to the large area, but we are concerned that if the paste melts from the outside edges in, then it will at a minimum result in flux entrapment, and at worst, the trapped flux will boil and lift the component, or move the molten solder causing shorts to the signal pads. I imagine that even if we used solid paste pattern that this would probably only make the problem worse. Or are we just being overly pessimistic? Any thoughts on options would be gratefully received... Currently wondering about the possibility of applying BGA balls to the package so that there is some clearance between the board and the component. If anyone is interested, I can send the component datasheet to them directly. Thank you all in advance Jeff Brown and Josh Vear EOS Space Systems --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- This message is processed by the PrivaWall Email Security Server. 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