Terry,
As per the data sheet provided on the AVX website
(http://www.avxcorp.com/docs/Catalogs/5611.pdf), the single sided connector
should have the side supports at the same Datum as the PCB Top side and
contact pins plane. That should allow automatic P&P and reflow without
additional support! If as you say, that's not the case then here is my
experience what we used for a similar connector (it had the supports, but
the PCB was not designed accordingly) - PCMCIA 68-pin, single sided. The
support plate/frame was FR4 one milled appropriately. It had positioning
pins, thus we used it trough the entire SMT process - paste printing, P&P
assembling and reflow. The cons are:
1. The nest (if needed) for the PCB panel in the support plate must be
milled very accurately.
2. The PCB panel must lay perfectly flat on the support plate (especially
where the connector is situated). I suppose the PCB thickness is ~ 0.5 mm
(0.020') and you may need to use tape to hold it down, especially during
reflow.
3. During the reflow process deformation may occur due to the different
expansion ratio (due to the different thickness) which will lead to not
correct positioning of the connector.
So, basically it's a tricky task! The best way is to take advantage as much
as possible of the wetting force of the pins towards the PCB pads and
provide just a little additional support to the connector.
Best regards,
Yordan Venev
Manufacturing Manager
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Terry Kozlyk
Sent: Thursday, January 05, 2006 6:34 PM
To: [log in to unmask]
Subject: [TN] SMT Connector Assembly Question
Technet;
I have a fine pitch single sided 50 pin edge connector to assemble onto
the edge of a PCB. It overhangs the PCB edge.
This is a SMT which is pick & placed from a reel.
Actually this is a single-sided 50 pin Compact Flash Connector from AVX
Series 5611 Receptacle Connector.
This PCB is panelized. This connector has 2 supports on each side but
the support plane is at the same Datum as the PCB bottom side
( DATUM A).
So the panel must have a milled out pocket for this connector to sit in.
Question is;
What is the best way to support this connector during pick & place, then
into reflow?
The pocket above is only a clearance & provides no support to hold the
connector in place.
The only thing I see now is having a bare FR4 panel underneath this PCB
to provide support for the connector.
Any thoughts are much appreciated.
Regards
Terry (TDK)
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