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. Will send a photo to Dr Gregory.
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