Hi Bogert:
It seems that as Michael says it may be labor intensive but it
can be done. The land is removed and a larger land with a trace
attached is glued to the substrate and overlapped solder on to the
existing track. Estimate about 2 bucks per land.
Regards,
Ramon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Michael McMonagle
Sent: Tuesday, November 22, 2005 8:09 AM
To: [log in to unmask]
Subject: Re: [TN] Making existing PWB land areas larger
Bogert,
Are the pads too small to make contact at all or too small to
provide a proper fillet at the ends of the component? If you are making
contact between the pad and the bottom of the termination, you're
probably better off to just leave it alone as it is. If you can get an
interfacial connection between the pad and the bottom of the component
termination, you can get a physically decent joint that will hold up to
normal usage. Been there, done that. If the product is subject to a
severe use environment, or Class 3, it might not measure up for the long
haul.
The customer designed the board incorrectly; they've got to make
the call. Trying to 'band-aid' a larger pad on to the existing one will
be labor intensive, and will reduce reliability overall. If you've just
got to do it, check out Circuit Technology Center at
http://www.circuittechctr.com/
Mike McMonagle
Quality Engineer
OYO Geospace
7007 Pinemont Drive
Houston, TX 77040
713-986-8650
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of - Bogert
Sent: Tuesday, November 22, 2005 4:27 AM
To: [log in to unmask]
Subject: [TN] Making existing PWB land areas larger
November 22, 2005
Folks we have an OEM who designed a PWB with too small a land area for
mounting a surface mount tantalum chip capacitor. This design does not
allow for replacing the capacitor via manual soldering with an iron
since the part will be damaged if the iron touches the part body. Is
there a way to enlarge the existing land size by some type of solder on
land piece. I know they make such an item that folks use for
replacement of damaged traces. If the lands can be increased in size,
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how does one do this and will a reliable solder connection result?
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847-615-7100 ext.2815
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