On Thu, 6 Oct 2005 19:35:36 -0500, "Ron H" wrote:

The 3M conductive adhesives like the 9703 work well. Not sure how they do it
but it conducts in the Z axis ( thru the adhesive ) but not accross the
surface direction ( X & Y axis ). It's a pressure sensitive transfer
adhesive ( tape that you stick on then peel off the paper carrier leaving
the adhesive behind)

X-Y axis Insulation Resistance = 3.4 x 10 to the 14th Ohms/square
Z axis Contact Resistance = 1.25 milliOhm-in2

Pretty neat stuff!

Ron H.


Sounds VERY interesting! I have some clients that need to mount
components that can't stand the heat of soldering. The only problem
might be "tenacity"... how much "shake, rattle and roll" can it take?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.

Jim Thompson wrote:
On Thu, 6 Oct 2005 19:35:36 -0500, "Ron H" wrote:


The 3M conductive adhesives like the 9703 work well. Not sure how they do it
but it conducts in the Z axis ( thru the adhesive ) but not accross the
surface direction ( X & Y axis ). It's a pressure sensitive transfer
adhesive ( tape that you stick on then peel off the paper carrier leaving
the adhesive behind)

X-Y axis Insulation Resistance = 3.4 x 10 to the 14th Ohms/square
Z axis Contact Resistance = 1.25 milliOhm-in2

Pretty neat stuff!

Ron H.



Sounds VERY interesting! I have some clients that need to mount
components that can't stand the heat of soldering. The only problem
might be "tenacity"... how much "shake, rattle and roll" can it take?

Its glorifies scotch tape:
http://multimedia.mmm.com/mws/mediaw...4spSxgrOkF W-

Just go to 3m.com and search for "conductive adhesive" or "9703"


"Jim Thompson" wrote in message
news
On Thu, 6 Oct 2005 19:35:36 -0500, "Ron H" wrote:

The 3M conductive adhesives like the 9703 work well. Not sure how they do
it
but it conducts in the Z axis ( thru the adhesive ) but not accross the
surface direction ( X & Y axis ). It's a pressure sensitive transfer
adhesive ( tape that you stick on then peel off the paper carrier leaving
the adhesive behind)

X-Y axis Insulation Resistance = 3.4 x 10 to the 14th Ohms/square
Z axis Contact Resistance = 1.25 milliOhm-in2

Pretty neat stuff!

Ron H.


Sounds VERY interesting! I have some clients that need to mount
components that can't stand the heat of soldering. The only problem
might be "tenacity"... how much "shake, rattle and roll" can it take?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.




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On Thu, 06 Oct 2005 19:28:54 -0700, Jim Thompson
wrote:

On Thu, 6 Oct 2005 19:35:36 -0500, "Ron H" wrote:

The 3M conductive adhesives like the 9703 work well. Not sure how they do it
but it conducts in the Z axis ( thru the adhesive ) but not accross the
surface direction ( X & Y axis ). It's a pressure sensitive transfer
adhesive ( tape that you stick on then peel off the paper carrier leaving
the adhesive behind)

X-Y axis Insulation Resistance = 3.4 x 10 to the 14th Ohms/square
Z axis Contact Resistance = 1.25 milliOhm-in2

Pretty neat stuff!

Ron H.


Sounds VERY interesting! I have some clients that need to mount
components that can't stand the heat of soldering. The only problem
might be "tenacity"... how much "shake, rattle and roll" can it take?

...Jim Thompson

Conductive adhesives have been discussed in Advanced Packaging
magazine (IIRC, might have been another trade mag) and the main
problems preventing widespread replacement of solder are not adhesion
but high initial resistance (not suitable for the current required by
large processors etc), and worse, gradual increase in resistance over
time especially at higher temperatures and humidities due to slow
oxidation of the conductors as water vapor and oxygen diffuse through
the adhesive polymers. Not ready for prime time now, and might not be
for a long time due to the lack of candidate impermeable adhesive
polymers. Suitable now for low power apps in benign envireonments
where long life is not important.

About 10 years ago there was considerable attention to this is the press.
We looked into it and didn't find anything which looked promising and
neither did the industry. For non critical circuitry, I suspect there is
possibilities

My idea (which was chuckeled at) was " conductive Velcro" Make parts with
the loops and boards with the hooks. Easy repair, eh? Zip off the old,
stuff on the new... No heat, no time to cure...

Imagine a demo of this compared to solder in the early days...

Let's look at the options for electronics assembly. Well you have two
choices:
1- Dip everything in molten lead.
2- stuff 'n go.

Which do you pick...Hmmm difficult chioce, eh?


Ther ewas also something called "particle interface". Many small sharp
conductive points on the PCB, but how to anchor the parts. This was
intended for test fixtures.

73, Steve, K9DCI