Sorry to hear that... Best of luck to you, Kim -----Original Message----- From: Inge [mailto:[log in to unmask]] Sent: Thursday, October 09, 2008 1:34 PM To: TechNet E-Mail Forum; Haynes, Kim Subject: Re: [TN] Need soldering advice ASAP No II Hi Kim, the pins are too week for press fit. The manufacturer sells it as a edge connector for through hole soldering. Personally, think it's madness, but I have to support the poor production team, who got this from a never-been-on-the-floor-design-engineer.. Inge ----- Original Message ----- From: "Haynes, Kim" <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, October 09, 2008 11:11 AM Subject: Re: [TN] Need soldering advice ASAP No II Hi Inge, Are you sure this is a connector that was designed for solder? I thought that 1mm connectors are usually intended as a press fit or action pin type assembly. With only 1mm pin to pin spacing, you are going to have a very difficult time getting enough of a pad for through-hole soldering. I am sure that you noticed the math, but one 1 mm space minus one pin diameter divided by 2 is the max pad size, if they could touch each other. Since touching is not allowed, subtract one-half of the required design rule clearance from the result and you will have the maximum pad diameter allowed by mechanics and design rules. This is very small and I would expect it to be difficult to not have bridging during the assembly process. So one again, are you sure this is not a press-fit connector? On another note, the inner rows are almost completely isolated and will require internal board layers to route into the pin field. Regards, Kim Haynes Interface and Clock Products High-Speed Serial Link Applications Texas Instruments, Inc. 214-567-2057 Telephone -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne Sent: Thursday, October 09, 2008 12:20 PM To: [log in to unmask] Subject: Re: [TN] Need soldering advice ASAP No II Killing the protrusion should linearly improve the process. If you have cut them to negligible protrusion and still have trouble, then you are stuck with flux/temperature/time games, or some kind of hot air blow-off like out of the HASL machine. Wayne -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Sent: Thursday, October 09, 2008 12:31 PM To: [log in to unmask] Subject: Re: [TN] Need soldering advice ASAP No II Also need advice concerning soldering of a 120 pin, three row, right angle, through hole edge connector. The pitch is 1 mm, and the through hole copper collar is such, that the space between them is just a fraction of a millimeter. We tried to use our selective soldering machine, but whatever we do, the SnPb overbridges all the pins! I'm not surprised, because the solder surface tension will not allow the solder to withdraw pin by pin. However, such connectors are made and sold plenty of, so they must be solderable, question is with what. The selective soldering machine's 'wave pot' is 10 mm across and the minimum wave top is 3 mm. Does it help to cut the pins so that they are even with the board ? Today, the pins protrude 0.3 mms . Anyone who knows nothing? /Inge PS. 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