Thanks for your responses.
I have planned for several more iterations on the stencil. I'm leaning
towards increasing the aperture length and decreasing the width along
with increasing the size of the unsupported alignement pin hole.
Steve
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tan Geok Ang
Sent: Wednesday, April 09, 2008 8:36 PM
To: [log in to unmask]
Subject: Re: [TN] Samtec QMSS-DP Series Differential Pair Connectors
Hi Steve,
One more item to take note is the guiding pins vs. the PCB
guiding hole design. You might want to cut of the guiding pins to try it
out first.
GA Tan
________________________________
From: TechNet on behalf of Tan Geok Ang
Sent: Thu 4/10/2008 8:32 AM
To: [log in to unmask]
Subject: Re: [TN] Samtec QMSS-DP Series Differential Pair Connectors
Hi Steve,
I used similar part previously, stencil opening is one of
the factors. You might want to re-study the opening at the centre of the
connector (if any) to ensure that it is not helping to lift/slant the
connector during reflow process. You might also want to extend the
stencil opening (toe) for the pins (another 3 to 5mils). Do study on the
connector design, too, e.g. will it slant left/right (affecting the
pitch), are the leads too long (resulted in more co planarity control
needed), etc. Hope this help.
Regards
GA Tan
________________________________
From: TechNet on behalf of John Burke
Sent: Thu 4/10/2008 5:16 AM
To: [log in to unmask]
Subject: Re: [TN] Samtec QMSS-DP Series Differential Pair Connectors
How long is the connector?. It is far more likely you have a connector /
board coplanarity issue.
John
John Burke
(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Sauer, Steve
(Xetron)
Sent: Wednesday, April 09, 2008 11:24 AM
To: [log in to unmask]
Subject: [TN] Samtec QMSS-DP Series Differential Pair Connectors
Good Afternoon,
Does anyone have any experience with the subject connectors?
I'm currently evaluating these connectors (the mate is QFSS series) for
a new application and am experiencing issues with coplanarity of the
leads resulting in random nonsoldered pins. The coplanarity is listed
on the spec sheet as .004" (.10mm) max and I'm using a 6mil stencil with
1:1 apertures (as recommended by the mfr).
Thanks in advance for your assistance.
Steve
Steve Sauer, CEPM
Sr. Project Engineer
Northrop Grumman Xetron
Cincinnati, OH
513-881-3368
[log in to unmask]
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