[Gta04-owner] Gta04-owner Digest, Vol 75, Issue 1

joerg at azami.de joerg at azami.de
Thu Mar 2 12:32:43 CET 2017


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>    1. Re: Gta04-owner Digest, Vol 74,	Issue 17 using foil whit
>       goldperls (H. Nikolaus Schaller)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 2 Mar 2017 09:06:12 +0100
> From: "H. Nikolaus Schaller" <hns at goldelico.com>
> To: List for communicating with real GTA04 owners
> 	<gta04-owner at goldelico.com>
> Subject: Re: [Gta04-owner] Gta04-owner Digest, Vol 74,	Issue 17 using
> 	foil whit goldperls
> Message-ID: <FD5B4959-051C-4D4F-9802-CE130783449B at goldelico.com>
> Content-Type: text/plain; charset=utf-8
>
> Hi,
>
>> Am 23.02.2017 um 23:49 schrieb joerg at azami.de:
>>
>>> Am 23.02.2017 um 12:22 schrieb joerg at azami.de:
>>>
>>> Hi all.
>>>
>>> About OMAP  unsolderable ?
>>
>> Well, it is solderable, but not at expected yield.
>>
>>>
>>>> I just wonder if it is possible to use a foil with micro gold pearls
>>>> an
>>>> glue the chip only in stat soldering.
>>
>>> Interesting idea! Does that exists at reasonable price or do we have to
>> get it
>> custom made?
>>
>> No Not custom made. I have seen it in a modern chip factory
>> presentation.
>
> I think I have found what you mean:

No, sorry it is defensively not the one

the one I have seen is transparent
flexible like a rubber tape
(my only when it is headed up)
 and it hat a kind of partial tiny gold alloy Perls in it an much higher
temperature numbers.

They were talking about that it is more reayable against head. course of
the flexibility ??? expanding an shrinking of the Chip wile heading up.

the Perls were so soft in the demonstration that they squised a bit wile
aplaing the chip. ??? hmmmm


>
> http://solutions.3m.com/wps/portal/3M/en_US/Electronics_NA/Electronics/Products/Electronics_Product_Catalog/~/3M-Electrically-Conductive-Adhesive-Transfer-Tape-9703?N=8704978+3294001720&rt=rud
> http://multimedia.3m.com/mws/media/66235O/3m-electrically-conductive-adhesive-transfer-tape-9703.pdf
>
> It is called "Z-axis Electrically Conductive Adhesive Transfer Tape".
>
> But I am not sure if it is reliable enough. Especially the OMAP3 can get
> hot (70?C) and cool
> down again in suspend so every temperature cycle may weaken the connection
> until it fails.
>
> Another factor is the conductivity. We have to carry ca. 1 Ampere into the
> OMAP at full power... Well, this is spread over ca. 10 or 15 BGA balls.
>
> The data sheet says something which I interpret as <0.3 ohms at 6 mm^2.
>
> Well, we have BGA balls with ca. 0.07 mm^2.
>
> With that, I would expect a resistance of <25 ohms per BGA ball.
> This is very likely too much. Not for signals but for power supply.
>
> So we would need such a tape with much lower resistance.
>
>>
>> course there chips hat so many gold plated contacts an thy are so close
>> together.
>>
>> The Perls were so small not too shorten and so many not to miss one
>> contact.
>> So every Contact hat at least one Perl.
>>
>> Another advantage is the heat it could resist a higher  one.
>> using pressure and heat the robot was very quick on it.
>>
>> An I remember they removed the leftover foil after putting the chip down
>> and chemically got the Perls for reuse back.
>>
>> I'am  trying to remember the footage or search for it again.
>>
>> LG Joerg Mueller
>
> BR and thanks,
> Nikolaus
>
>
>
>
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> End of Gta04-owner Digest, Vol 75, Issue 1
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