Howard,

From past experience, electrolytics do not like exposure to high
temperatures, as, yes, they do leak. You cannot exceed the manufacturer's
specs with impunity just because your process won't give you the solder
joint quality you're looking for within component spec.

You will need to find another process (hand soldering, wave soldering or
IR) that is a bit kinder to these wee fellows and still give you the joints
you need.

Best rgds

Peter




                    Howard Watson
                    <Howard.Watson@A        To:     [log in to unmask]
                    METEK.COM>              cc:     (bcc: DUNCAN Peter/Asst Prin Engr/ST
                    Sent by: TechNet        Aero/ST Group)
                    <[log in to unmask]        Subject:     [TN] Al Electrolytic Capacitors
                    >                       leaking


                    01/17/02 04:27
                    AM
                    Please respond
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                    E-Mail Forum.";
                    Please respond
                    to Howard.Watson







Technetters,

Please help!  I have some Aluminum Electrolytic Capacitors that are leaking
fluid on the top of the can after reflow.  My peak temperature on the top
of the can is 218C, with a time above 183 at 53 seconds, which seem to be
appropriate.  The manufacturer recommends the time above 200C to be 20
seconds maximum, which is too little on these boards to get good solder on
all the components.  The boards are reflowed in a Vitronics 10 zone
convection oven.  The part is Nichicon #2309369R25.  Is anyone familiar
with this type of problem, and if so any suggestions will be greatly
appreciated!   Are these type of parts prone to failure at high
temperatures?

Howard Watson
Manufacturing Engineer
AMETEK/Dixson



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