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June 2013

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Subject:
From:
Steven Creswick <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steven Creswick <[log in to unmask]>
Date:
Fri, 14 Jun 2013 14:55:13 -0400
Content-Type:
text/plain
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text/plain (349 lines)
Yes!  

Single point TAB bonding for me however.

Steve C

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Friday, June 14, 2013 8:18 AM
To: [log in to unmask]
Subject: Re: [TN] Dropbox NTC

I remember..... 
TAB [Tape Automated Bonding not the drink] was going to solve all this in
one quick press of a hot bar. 


  
Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steven Creswick
Sent: Friday, June 14, 2013 12:55 AM
To: [log in to unmask]
Subject: Re: [TN] Dropbox

Wayne - Inge,

I remember wire bonding highly specialized die with hundreds of wires per
die and costing $10k's each - Absolutely "no pressure".  Yeh right!  No
screw-up allowed on the die, or substrate!

Then there are the more 'jelly bean' types of parts that ran at the rate of
10's of thousands of wires per day - and those were in the olden days.  

My later bonders were capable of 5-7 wires per second and you could do 10K
wires easily in a shift!  Now there are wire bonders readily capable of well
more than 10+ wires per second... all at 2-5µm placement accuracy and
phenomenal repeatability.  

You guys have been there too!  Leave nothing to chance - if you can help it.
It is like flying a small aircraft, or ultralight.  Endings are happier if
you pay attention to the details.

Inge, there were µwave based UV/ozone cleaners on the market for surface
cleaning.  I never had the opportunity to work with one so I don't know if
the UV energy created by the µwave UV/ozone cleaners was more intense than
that generated by the typical partial vacuum RF plasma cleaners or not.
Even when running pure oxygen at relatively high chamber pressures of
~100-150mT, the faint blue glow of the oxygen plasma in our RF units was not
at all intense.  Most of the time you had to turn off the room lights to
even see it.  My impression was that the µwave cleaners could be more
chemically aggressive and visually intense, but I have nothing to
substantiate that.

I can definitely appreciate what you say Wayne.  I am glad we had relatively
few to do.  There we plenty of other opportunities for hair loss!


Steve Creswick
Sr Associate - Balanced Enterprise Solutions
http://www.linkedin.com/in/stevencreswick
                         616 834 1883



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Thursday, June 13, 2013 5:22 PM
To: [log in to unmask]
Subject: Re: [TN] Dropbox

Agree, have been in the MCM/Hybrid business for 40 years! Cut the red 1 sq
meter films by hand! Mixed our own silver glue. Modified first bonding
machine from K&S. Lots of problems with hand soldering (sealing) metal
covers to base. Vibration chipouts in silicon semis. And lots more. My
paranoya: bond lifts caused by too much frit glass on thickfilm conductors.
Still hate gold wire rupture in autobonders. And still hate to see a 0.1
gram wire among 100 7grams.

Inge


On 13 June 2013 22:37, Wayne Thayer <[log in to unmask]> wrote:

> Paranoia.  When you do lots of wirebonding you will do almost anything 
> to assure there is nothing in the way of making a good weld.  Die from 
> wafer fab should be OK, but did any die attach outgassing byproducts 
> deposit on the wirebond pads?  And sometimes we have to do SMT prior 
> to wirebond--hard to imagine a more filthy process!
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
> Sent: Thursday, June 13, 2013 4:27 PM
> To: [log in to unmask]
> Subject: Re: [TN] Dropbox
>
> On board there are many bare dies nowadays. - I guess.
> --------------------------
> Sent using BlackBerry
>
>
> ----- Original Message -----
> From: Inge Hernefjord [mailto:[log in to unmask]]
> Sent: Thursday, June 13, 2013 04:19 PM
> To: [log in to unmask] <[log in to unmask]>
> Subject: Re: [TN] Dropbox
>
> Wayne, why on earth (not SPACE) did you UV clean bare chips?
>
> Inge
>
>
> On 13 June 2013 22:14, Wayne Thayer <[log in to unmask]> wrote:
>
> > I've been "burned" by UV/Ozone cleaning of bare die which have FLASH 
> > or EEPROM.  When they make these, it is common for the manufacturer 
> > to put a device code in this space and/or store a table of "bad
sectors".
> > Too much UV erased the memory, so programmers don't know how to 
> > program
> the parts.
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
> > Sent: Thursday, June 13, 2013 2:03 PM
> > To: [log in to unmask]
> > Subject: Re: [TN] Dropbox
> >
> > Thx. Would be interested to know any CSP, flipchip, etc.
> > --------------------------
> > Sent using BlackBerry
> >
> >
> > From: Inge Hernefjord [mailto:[log in to unmask]]
> > Sent: Thursday, June 13, 2013 01:59 PM
> > To: TechNet E-Mail Forum <[log in to unmask]>; Steven Creswick < 
> > [log in to unmask]>; Joyce Koo
> > Subject: Re: [TN] Dropbox
> >
> > Hi, genious duo,
> >
> > I had an old US Army report that emphasizes a lot about irradiation 
> > of semiconductors. Now, you have to make a distinction between 
> > cleaning semiconductors and expose them to natural irradiation as 
> > ready
products.
> >  UV/O2 is a outstanding method of cleaning any substrates, inclusive 
> > semiconductor wafers of all kinds, because you get a cleanliness on 
> > molecular level. And under controlled processes, the method does not 
> > cause any harm to the target.
> >
> > About semi packages and irradiation, I understand what Juice aim at, 
> > namely a exposure to high energy partikels or photons or phonons at 
> > such a intensity level that you exceed the band gap levels ,  equal 
> > to a memory I/O status shift.  I believe modern packages and semis 
> > are radiation hardened for critical applications like for SPACE and 
> > others. If you, of some reason, want to clean assembled boards by 
> > means of UV/Ozone, nothing will happen.
> >
> > You can take part of the report under 'Cleaning' and the title is 
> > 'UV-Ozone Cleaning of Semiconductor Surfaces'.
> >
> > Steve, you are welcome to add your antique papers to Dropbox. As I 
> > said, most was evaluated decades ago.
> >
> > Inge
> >
> >
> > On 13 June 2013 17:28, Steven Creswick <[log in to unmask]
> <mailto:
> > [log in to unmask]>> wrote:
> > Joyce,
> >
> > I am going to send a couple old papers on plasma cleaning to Inge to 
> > see if he will incorporate them into his drop box.  They are both
> > 1989 vintage, essentially back in the olden days of plasma cleaning, 
> > so may be of little specific use, other than generics.
> >
> > If I get the time I will attempt to search through some of the
> > 1990-2000 ISHM/IMAPs symposiums for more info
> >
> > ?Thought you were on vacation ...?
> >
> > Steve Creswick
> > Sr Associate - Balanced Enterprise Solutions 
> > http://www.linkedin.com/in/stevencreswick
> >                          616 834 1883<tel:616%20834%201883>
> >
> >
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]<mailto:[log in to unmask]>] On 
> > Behalf Of Joyce Koo
> > Sent: Thursday, June 13, 2013 10:22 AM
> > To: [log in to unmask]<mailto:[log in to unmask]>
> > Subject: Re: [TN] Dropbox
> >
> > Inge, any study regarding the potential damage of memory by UV ozone?
> > Especially, programmables.  Thx.
> > --------------------------
> > Sent using BlackBerry
> >
> >
> > ----- Original Message -----
> > From: Inge Hernefjord [mailto:[log in to unmask]<mailto:
> > [log in to unmask]>]
> > Sent: Thursday, June 13, 2013 09:37 AM
> > To: [log in to unmask]<mailto:[log in to unmask]> <[log in to unmask]<mailto:
> > [log in to unmask]>>
> > Subject: [TN] Dropbox
> >
> > / Cleaning
> >
> > added
> >
> > 1. Relative Etch rate in Fluorcarbon Plasmas
> >
> > 2.UV/Ozone Cleaning of Surfaces
> >
> > 3. Very Low Temperature Ashing (VLTA)
> >
> > Old information, still actual, but hard to find. Most about cleaning 
> > was done more than 20 years ago. The Cyprus guru knows. He has 
> > written a good book that is permanently on my desk.
> >
> > Inge
> >
> >
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