Your paste manufacturer will use almost certainly use 0.025", possibly
0.040" thick 96% alumina, this is a consistent surface from batch to batch
and also pretty well supplier to supplier, so if alumina is used test
results will be consistent and also relate to the paste manufacturer (which
would ease any possible debates or discussions with them).
An organic substrate, being a complex and somewhat proprietary material,
represents a variable from the paste supplier and possibly from batch to
batch depending on state of cure, how made, which manufacturer and so on. In
the end it depends why and how often you are wanting to do these tests. You
could for example get one [possibly huge] batch of substrate and never use
another so your test result would be consistent to themselves. I must say I
am a little curious as to why you want to do this. Is your paste supplier
not on ship to line status?
Regards
Mike Fenner
Applications Engineer, European Operations
Indium Corporation
T: + 44 1908 580 400
M: + 44 7810 526 317
F: + 44 1908 580 411
E: [log in to unmask]
W: www.indium.com
Leadfree: www.Pb-Free.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Morse, Carrie
Sent: Tuesday, November 12, 2002 4:01 PM
To: [log in to unmask]
Subject: Re: [TN] Ceramic Substrate Supplier?
I can't seem to find my TM-650 test for solder balls, but, I think when I've
done testing I've used plain old phenolic material (G10, FR4). Does the
test method specify ceramic?
-Carrie
-----Original Message-----
From: Rick Thompson [mailto:[log in to unmask]]
Sent: Monday, November 11, 2002 6:46 PM
To: [log in to unmask]
Subject: Re: [TN] Ceramic Substrate Supplier?
Carrie,
My intent was to use them to evaluate the tendency of solder paste to create
solder balls.
Rick
===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
11/11/02 7:30 am
>Out of curiosity Rick, what will you be using the substrates for?
>I've done a few solder paste evals and used other materials as a base to
>work on.
>
>-Carrie
>
>-----Original Message-----
>From: Rick Thompson [mailto:[log in to unmask]]
>Sent: Friday, November 08, 2002 4:00 PM
>To: [log in to unmask]
>Subject: [TN] Ceramic Substrate Supplier?
>
>
>Hi,
>
>Can anyone recommend any suppliers of small quantities of ceramic
substrates
>to use for solder paste evaluation?
>
>Thanks,
>
>Rick Thompson
>
>Sr. SMT Process Engineer
>SMTEK International, Inc.
>+1 (805) 532-2800
>[log in to unmask]
>
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>-----------------------------------------------------
Rick Thompson
Sr. SMT Process Engineer
SMTEK International, Inc.
+1 (805) 532-2800
[log in to unmask]
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