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August 2008

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Subject:
From:
"Wilson, Bob" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wilson, Bob
Date:
Thu, 14 Aug 2008 09:57:27 -0700
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Right.

There are a number of benefits to using the higher Tg that might offset
the 5% increase.

The higher Tg is best for lead-free.  It also allows easier hand
soldering and repair because of the higher temps.

And, it has better z-axis expansion (less of it) and that reduces the
chance of plated hole cracking.

You could recoup that extra 5% by increasing yield. 

Bob Wilson
E/M Designer, CID+
SpectraSensors, Inc.
11027 Arrow Route
Rancho Cucamonga, CA 91730
(909) 948-4110
www.spectrasensors.com
www.ipc.org
 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas O. Pauls
Sent: Thursday, August 14, 2008 9:23 AM
To: [log in to unmask]
Subject: Re: [TN] TG 130 or Tg 170 for ENIG

I don't know if it is a "standard practice", but I would certainly 
recommend it.  You need the extra margin that the higher Tg gives.

Doug Pauls




Lenny Carter <[log in to unmask]> 
Sent by: TechNet <[log in to unmask]>
08/14/2008 11:19 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Lenny Carter <[log in to unmask]>


To
[log in to unmask]
cc

Subject
[TN] TG 130 or Tg 170 for ENIG






Hey technetters- We adopted the ENIG finish for our RoHS compliant parts
2
years ago.  We recently had discussions with our primary pcb vendor and 
they
recommended we switch to a Tg170 FR4 material for our pcbs instead of
our
standard Tg130 we have been using for years.
This recommendation was made because of the higher reflow temperatures
necessary for the lead free process.
 
Is this standard practice?  we are a little hesitant to make the switch
as
it would mean an approximate 5%price increase on all our pcbs.
 
Any input is appreciated.
 
thanks, Lenny Carter  ERG, Inc.   www.ergpower.com
 

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