I would worry more about the "replacement"/"repairs"/"reworks" than leaving
it as is ;
Have to agree with Steve ; no need to push 603 pads needlessly .
Sorry to disagree Matt ; but I'd prefer to drive without sus reworks .
Secondary validation :
STELLA ; to be able to sleep without nightmares of freeway pile ups :
Find yourself a relevant quick test ( accelerated cycling ) some you can
close in week ,
if Werner won't pull one out of his hat I'll dig in my files ; but it's
really his hobby .
With 805's you should have no issues ; but you'll have to validate it :
Primary validation :
Perhaps the fastest rubber stamp in your sector :
Get it through relevant (standards set you work to) vibrating test ; the
cycling considering it's battle of two small passives and less load on 805's
anyhow would be perhaps useless delay as well (do it as a follow up)
Pull or shear tests are not relevant in this dimensions ; as vibro test
should indicate .
See you Stella
Paul Klasek
http://www.resmed.com
PS
the expert really is Werner (although he proved to be mortal on rare
occasions too) ; I took the liberty (as usual) to list him on send ;
hopefully he'll bite with specifics, correctly worded reflecting worsening
legal climate nowadays .
> ----------
> From: Matthew Park[SMTP:[log in to unmask]]
> Sent: Tuesday, 2 March 1999 6:50
> To: [log in to unmask]
> Subject: Re: [TN] Soldering fillet
>
> Stella.
>
> I know this sounds silly. Replace 805 pkg resistors with 605 pkg
> resistors. Believe me it is a wiser option than fiddling with pull
> test, vibration test, reliability test....so on.
> Anyway, Who is your end-customer, GM, Chrsyler, Ford, Nissan
> or Toyota? Hey, making sure my next car won't crash on me
> with repair bills...
>
> Matthew
> Norsat International Inc.
>
> >>> <[log in to unmask]> March 1, 1999 7:56 am >>>
> Dear experts,
> We are building electronics for automotive industry.
> We have a number of boards where 0805 package resistors
> were placed and
> reflowed on the 0603 pads. As the results there is no side
> concave solder
> fillet, only under the component terminations.
>
> What options other than scrapping the boards would you
> suggest? ( Rework:
> remove and replace. Do some testing (vibration, pull test??).
> Please, help
> Thank you, very much
> Stella N
>
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