FreeLists / si-list / [SI-LIST] Re: soldering plastic balls

[steve weir <weirsi@xxxxxxxxxx>]

Lars, the idea of the plastic balls is that they have only  a thin outer 
conducting layer and therefore the resistance remains much more uniform 
and therefore equalizing loss across a broad frequency range.

Steve.
Lars Juul wrote:
> Hi David,
> I would call up your packaging vendor and ask them to make a test build with
> ball samples from Sekisui on existing 10 Gbps BGAs, provided the ball attach
> tool is suitable for this. This is usually the stumbling block, as this is
> very expensive in NRE.
>
> Alternatively, it's worth exploring if you make a manual ball attach
> (possible if the packages are for small form factor 10Gbps CDRs, for
> instance) by printing solder paste on the package lands first, and then
> manually place the balls  on the paste by a trained person with a steady
> hand. I assure you, crazier things have been made.
>
> On the other hand, my only concern with this kind of balls would be the
> suitability for them in the power supply, as I imagine the current carrying
> capabilities are somewhat limited if you have a plastc core on the inside.
> (I don't think it's possible to attach solid solder and plastic balls on
> specific lands on the package in a high volume setup, yet)
>
> PS: you're asking whether they work at 10GHz, which is a single frequency
> point, I think it's feasible to use plastic core balls for a narrowband
> application, but if it's broadband from 0 to 10e9 Hz you're driving at, I'd
> say, try it out in practise first to see if it flies, then make a full wave
> or macromodel of package afterwards to feed the chip I/O designers.
>
> Have fun.
>
> Best regards,
> Lars
>
> 2007/6/5, david stern <dan1_st@xxxxxxxxx>:
>   
>> hello all
>>
>>   I was looking for bga soldering balls  technology for an
>> application working at 5GHz to 10GHZ and  and found
>> soldering plastic balls from SEKISUI. Did somebody work with them at
>> 10Ghz?
>>
>>   Thanks
>>
>>   David
>>
>>
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