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'[EE:] Lead Free components - coming to a PCB near '
2004\08\11@061653 by Russell McMahon

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For those interested or affected, and for those who scoff at the reality of
the transition to lead free solder and lead free products, here is Linear
Technology's position on & and progress towards lead free componentry. LT,
while not as large as some, are not a minor player in the electronics field.

       http://www.linear.com/about/pbfree.html

Dated Jan 2004 and currently on their web site.

_____________________________

Note:

"In order to comply with the EC deadline of July 2006, we plan to convert to
Matte-Tin as our standard terminal finish by the end of 2005. As Linear
Technology Corporation converts a package type to Lead-Free, as our standard
plating finish; we will provide notification (PCN) to our direct customers
and Distributors prior to 100% conversion to this lead-free alternative. "

And

Current lead-free solder paste alternatives, which have a 25°C to 50°C
higher melting temperature than tin-lead solder, push the performance limit
of the systems used in printed circuit board assembly. In addition, the
260°C peak re-flow temperature used on lead-free alternatives will adversely
impact the moisture performance of our packages. To date, moisture
sensitivity testing conducted at a peak re-flow temperature of 260°C has
confirmed this drop in moisture performance, but results to date indicate
that our matte-tin plate packages are still reliable after exposure to these
more stringent re-flow conditions.

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2004\08\11@082922 by M. Adam Davis

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Russell McMahon wrote:

>Current lead-free solder paste alternatives, which have a 250C to 500C
>higher melting temperature than tin-lead solder, push the performance limit
>of the systems used in printed circuit board assembly. In addition, the
>2600C peak re-flow temperature used on lead-free alternatives will adversely
>impact the moisture performance of our packages.
>
I don't recall seeing 500F toaster ovens at the store - I'll have to
take another look.  With a little more insulation we ought to reach
those temperatures, but still...

-Adam

>
>

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2004\08\11@085830 by Randy Glenn

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The trailing zeroes should be degree signs (250C => 25 degrees C) -
but hey, what's an order of magnitude between friends?

On Wed, 11 Aug 2004 08:30:22 -0400, M. Adam Davis <spam_OUTadampicTakeThisOuTspamubasics.com> wrote:
{Quote hidden}

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-Randy Glenn
Computer Eng. and Mgt. Year IV, McMaster University
Chair, McMaster IEEE Student Branch

randy.glenn-at-gmail.com - glennrb-at-mcmaster.ca
randy.glenn-at-computer.org - randy_glenn-at-ieee.org
http://www.randyglenn.ca

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2004\08\11@094432 by Russell McMahon

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> The trailing zeroes should be degree signs (250C => 25 degrees C) -
> but hey, what's an order of magnitude between friends?

Another superb example of "Bill Gates, Bill Gates ... !!"" - unicode and
shift-Alt-right-mason's-Handshake or not.
That was a cut and paste of something BY ME which started off as degrees C
and ended up as "0 C"

Note that Adam correctly converted the 260 C to 500 F

Interestingly - in my copy of the original the degrees symbol shows OK.
I don't see my list post so I don't know what people see.
The corruption MAY have occurred on my first post OR after it had been sent
to Adam and then back again. Probably the latter I think.

Here's another cut and paste, taken from my sent copy:

   25°C to 50°C ...
   260°C peak re-flow  ...

In each case the degree symbol is seen by me as a superscript small o.
What do people see when they read my post?

I wonder what email pgm Adam uses.

Bill Gates, Bill Gates ... !
(This should be said while holding both arms at full length in front of you
with index fingers crossed (usually with right index vertical and left index
pointing horizontally left to right, in front of right index finger).
Rubbing ones-self with a crushed garlic clove prior to this probably doesn't
help at all. Be wary of sleeping at cross roads.

This is the munged version (at least as I and Randy see it).

> > >Current lead-free solder paste alternatives, which have a 250C to 500C
> > >2600C peak re-flow temperature used on lead-free alternatives will
adversely



       Russell McMahon

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2004\08\11@102657 by M. Adam Davis

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I use Mozilla 1.something (should upgrade since the latest libpng
vulnerability...)

Your original message dod have the correctly formatted degree symbol.  I
considered adding one to my 500F, but I figured it was too much
trouble.  Didn't realize that other email programs corrupted that symbol.

2600 degrees Celsius would be somewhat difficult to achieve with the
standard toaster oven since even stainless steel melts at 1/2 that
temperature, but I suspect a pottery kiln could be used for it.  We
probably won't have to worry about it until we have to start using
titanium iridium alloy solders (1820C and 2454C respectively).
Melting temperatures of metals:
http://www.wika.ca/wika/products/supportfiles/material/I3.PDF

Just think, though - if your project falls into the steel smelter you
know your solder joint is going to hold...

-Adam

Russell McMahon wrote:

{Quote hidden}

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2004\08\11@103322 by Randy Glenn

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The original post looked fine to me in GMail. From the headers, I'm
guessing Adam's using some sort of webmail (no X-Mailer header)

On Thu, 12 Aug 2004 01:39:15 +1200, Russell McMahon
<.....apptechKILLspamspam@spam@paradise.net.nz> wrote:
{Quote hidden}

-- -Randy Glenn
Computer Eng. and Mgt. Year IV, McMaster University
Chair, McMaster IEEE Student Branch

randy.glenn-at-gmail.com - glennrb-at-mcmaster.ca
randy.glenn-at-computer.org - randy_glenn-at-ieee.org
http://www.randyglenn.ca

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2004\08\11@132740 by Russell McMahon

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The original post looked fine to me in GMail. From the headers, I'm
guessing Adam's using some sort of webmail (no X-Mailer header)

> Here's another cut and paste, taken from my sent copy:
>
>    25°C to 50°C ...
>    260°C peak re-flow  ...
>
> In each case the degree symbol is seen by me as a superscript small o..
> What do people see when they read my post?


And unchanged here


       RM

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2004\08\11@132741 by Russell McMahon

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> I use Mozilla 1.something (should upgrade since the latest libpng
> vulnerability...)

> >Here's another cut and paste, taken from my sent copy:
> >
> >    250C to 500C ...
> >    2600C peak re-flow  ...

Yep - changed again

> >In each case the degree symbol is seen by me as a superscript small o.

No longer.



   RM

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2004\08\11@214523 by Andrew Warren

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Russell McMahon <PICLISTspamKILLspammitvma.mit.edu> wrote:

> Here's another cut and paste, taken from my sent copy:
>
>     25°C to 50°C ...
>     260°C peak re-flow  ...
>
> In each case the degree symbol is seen by me as a superscript small o.
> What do people see when they read my post?

   I'm using Pegasus Mail and I see degree symbols.

   -Andy

=== Andrew Warren -- .....aiwKILLspamspam.....cypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
===
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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