These usually can be masked easily with a pallet. Give me a buzz offline if
you'd like to discuss it.
Jim Gleason
972-494-1911
----- Original Message -----
From: "Dorothy M. Lush" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, October 02, 2001 11:03 AM
Subject: Re: [TN] Tantalum Caps


> Jorge,
>
> I have always heard that the manufacturers of tantalum capacitors
recommend
> these parts never be exposed to the thermal shock of the solderwave. I
also
> heard that the low ESR tant's are particularly sensitive to thermal shock.
> No one wants these parts to fail in the field. That's bad.
>
> Can these parts be selectively removed from solderwave with a solder
> pallet/fixture? Why are these parts on the bottom side and not the top?
Have
> you asked for that? In my DFMs my rule-of-thumb for SMD clearance around a
> PTH lead equals the tallest SMD part height (that might interfere with
> fixture design) plus150 mils. So if you have only chip parts the clearance
> is 150 mils plus the chip height. (All bets are off if the SMD part is
over
> 350 mils.) Also, can your PTH parts be paste-in-holed so you can skip this
> whole issue?
>
> Dorothy Lush
> > ----------
> > From:         Jorge Rodriguez[SMTP:[log in to unmask]]
> > Reply To:     TechNet E-Mail Forum.
> > Sent:         Tuesday, October 02, 2001 10:28 AM
> > To:   [log in to unmask]
> > Subject:      Tantalum Caps
> >
> > Technetters,
> >
> > I have a product that has Tantalum Caps, having them waved would make
our
> > life easier, the board has some TH components we currently hand solder
and
> > that could be waved. I know that there might be some reason not to wave
> > Tantalums, but I am not sure. Can Tantalum Caps be wave soldered?, Has
> > anyone done this?
> >
> > Any responses would be appreciated
> >
> > Jorge Rodriguez
> > Process Engineer
> > Varian Inc
> >
>
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