careful with FR408 if you have to reflow at Pb-free temps.

At 03:21 PM 7/20/2012, [log in to unmask] wrote:
>Hi Ken,
>
>Thanks.  I am familiar with FR408.  However my thinking was that it is
>only marginally superior to FR4.  I will definitely look it up.
>Simulations show marginal performance with FR4, but I will check again on
>the actual design.  If we can make it work with FR4 then it will make my
>task much simpler.
>
>
>Regards
>Ravinder Ajmani
>HGST, a Western Digital company
>[log in to unmask]
>
>
>5601 Great Oaks Pkwy.
>San Jose, CA 95119-1003
>www.hgst.com
>
>
>
>
>"Kenneth J. Wood" <[log in to unmask]>
>07/20/2012 02:05 PM
>
>To
>"'TechNet E-Mail Forum'" <[log in to unmask]>, <[log in to unmask]>
>cc
>
>Subject
>RE: [TN] Low Loss PCB Material
>
>
>
>
>
>
>Ravinder,
>I am a fan of the Isola FR408 for hi-speed designs.
>
>http://www.isola-group.com/products/fr408/
>
>This is what we used at Adaptec for all our hi-speed boards.
>
>That being said, I recently designed a 10GBit PCB that my customer uses
>standard 170C tg FR-4 and it works fine.
>Not my call on the substrate but it does work...
>Ken
>
>_____________________________________
>Kenneth J. Wood
>Saturn PCB Design, Inc.
>[log in to unmask]
>www.saturnpcb.com
>
>
>
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of
>[log in to unmask]
>Sent: Thursday, July 19, 2012 9:11 PM
>To: [log in to unmask]
>Subject: [TN] Low Loss PCB Material
>
>Hi All,
>
>We discussed with our quick-turn fab the use of low-loss PCB materials for
>high-speed applications.  As per the discussions,the only such material
>that
>is Halogen-Free and has UL Approval seems to be Rogers Theta material.  If
>there are other materials available in US and more importantly at the
>high-volume fabs off-shore then please share the information.  I will
>really
>appreciate it.
>
>Thanks.
>
>
>Regards
>Ravinder Ajmani
>HGST, a Western Digital company
>[log in to unmask]
>
>
>5601 Great Oaks Pkwy.
>San Jose, CA 95119-1003
>www.hgst.com
>
>
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