Hi Dwight,
Thanks for providing the detailed answer. This is very helpful. I agree
that Theta is a very good choice. My preference is to use 3313. However
management would like to have other options too.
Regards
Ravinder Ajmani
HGST, a Western Digital company
[log in to unmask]
5601 Great Oaks Pkwy.
San Jose, CA 95119-1003
www.hgst.com
Dwight Mattix <[log in to unmask]>
07/20/2012 12:13 PM
To
TechNet E-Mail Forum <[log in to unmask]>, <[log in to unmask]>,
<[log in to unmask]>
cc
Subject
Re: [TN] Low Loss PCB Material
In that case Theta should be an excellent choice.
At those freq's be sure to spec use of flat glass for less variation
in your circuits. e.g.. 1037, 1078 and 3313 vs 106, 1080, 2116.
There's a competing TUC material that's halogen free and low loss and
shows good rel results.
Nelco is touting their N4800-20 but I'm not sure if it's halogen free.
In early efforts with Theta I've seen encouraging reliability results
(IST and CAF). Have completed 2 test vehicle evals thus far:
1) .4mm pitch .170" thick 5 mil (flipdrill) Loadboard. 10 seconds
230C reflow simulation followed by 1000 IST cycles @150C.
2) .4mm pitch DUT, 1.4mm thick 18 layer (3+12+3 stackup) with uVia
stacked on center core via) ran 1000 cycles @ 150C after 9x 260C 10
second precondition cycles.
YMMV. Results are heavily dependant on specific stackup and
fabricators. So do your own due diligence. There's only a handful of
fabricators we've found who can build either of those two stackups
consistently and reliably pass those IST profiles on conventional
Pb-free material (e.g. FR370HR).
CAF results are heavily dependant on glass styles used and your
design spacings so I'll say less there but will say that Theta has
become a benchmark material for me to compare CAF test results of
other materials too. Again, YMMV.
cheers,
dw
At 08:45 AM 7/20/2012, [log in to unmask] wrote:
>Hi Joyce,
>
>It is 12 Gbps Serial Interface. Material should be available at the
>high-volume off-shore fabs, and cost is also a major consideration.
>
>
>Regards
>Ravinder Ajmani
>HGST, a Western Digital company
>[log in to unmask]
>
>
>5601 Great Oaks Pkwy.
>San Jose, CA 95119-1003
>www.hgst.com
>
>
>
>
>Joyce Koo <[log in to unmask]>
>07/20/2012 06:02 AM
>
>To
>'TechNet E-Mail Forum' <[log in to unmask]>, "[log in to unmask]"
><[log in to unmask]>
>cc
>
>Subject
>RE: [TN] Low Loss PCB Material
>
>
>
>
>
>
>How high is "high"?
>
>Joyce Koo
>Materials Researcher - Materials Interconnect Lab
>Research In Motion Limited
>Office: (519) 888-7465 79945
>Mobile: (226) 220-4760
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of
>[log in to unmask]
>Sent: Friday, July 20, 2012 12:50 AM
>To: [log in to unmask]
>Subject: Re: [TN] Low Loss PCB Material
>
>Hi Richard,
>
>Thanks a lot. I will check out these materials.
>
>
>Regards
>Ravinder Ajmani
>HGST, a Western Digital company
>[log in to unmask]
>
>
>5601 Great Oaks Pkwy.
>San Jose, CA 95119-1003
>www.hgst.com
>
>
>
>
>"Stadem, Richard D." <[log in to unmask]>
>Sent by: TechNet <[log in to unmask]>
>07/19/2012 06:54 PM
>Please respond to
>TechNet E-Mail Forum <[log in to unmask]>; Please respond to
>"Stadem, Richard D." <[log in to unmask]>
>
>
>To
><[log in to unmask]>
>cc
>
>Subject
>Re: [TN] Low Loss PCB Material
>
>
>
>
>
>
>Hi, Ravinder
>You might want to look at the following:
>Nelco N4000-13EP
>Panasonic Megtron Getek
>Taconic RF-35TC or RF35A2
>
>I know these are all RF-tailored, but not sure if all are halogen free. I
>know the Taconic materials are.
>You would need to check with them about the UL approval rating.
>
>________________________________________
>From: TechNet [[log in to unmask]] On Behalf Of [log in to unmask]
>[[log in to unmask]]
>Sent: Thursday, July 19, 2012 8:10 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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