Thanks Dan
--
Jack Evans
Process & Equipment Engineer II
Cobham Semiconductor Solutions
T : +1 (719) 594 8362
Please consider the environment before printing this email
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of TechNet automatic digest system
Sent: Monday, September 14, 2015 11:00 PM
To: [log in to unmask]
Subject: TechNet Digest - 11 Sep 2015 to 14 Sep 2015 (#2015-173)
There are 8 messages totaling 501 lines in this issue.
Topics of the day:
1. Bees wax (7)
2. Board with Nickel/Gold plating
----------------------------------------------------------------------
Date: Mon, 14 Sep 2015 09:29:14 -0500
From: Victor Hernandez <[log in to unmask]>
Subject: Bees wax
Fellow TechNetters:
In a previous life, the other Big Blue, I used a product referred to as "Bees Wax" for mounting ICs onto a sample holder for polishing. A small amount of bees wax was melted and then the IC placed over it and let to dry. The IC would not move on the holder till reheated. Does anyone out there have a real name and part number for this product and where I can purchase it... I currently have a need to use it in a different application.
Victor,
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Date: Mon, 14 Sep 2015 09:32:53 -0500
From: David Hillman <[log in to unmask]>
Subject: Re: Bees wax
Hi Vector - check either the Leco or Buehler websites for such a material
as they both are major metallurgical cross sectional suppliers.
Dave Hillman
Rockwell Collins
[log in to unmask]
On Mon, Sep 14, 2015 at 9:29 AM, Victor Hernandez <
[log in to unmask]> wrote:
> Fellow TechNetters:
>
> In a previous life, the other Big Blue, I used a product referred to as
> "Bees Wax" for mounting ICs onto a sample holder for polishing. A small
> amount of bees wax was melted and then the IC placed over it and let to
> dry. The IC would not move on the holder till reheated. Does anyone out
> there have a real name and part number for this product and where I can
> purchase it... I currently have a need to use it in a different
> application.
>
> Victor,
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
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> ______________________________________________________________________
>
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------------------------------
Date: Mon, 14 Sep 2015 10:35:37 -0400
From: "lduso - Diamond-MT.com" <[log in to unmask]>
Subject: Re: Bees wax
Sounds like something similar to Carbowax
<http://t.sidekickopen03.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJN7t5XYgdVhPKW4WYq3x5wvpw0W7fRL1x56dPnsf3Pj9QP02?t=http%3A%2F%2Fwww.dow.com%2Fpolyglycols%2Fpolyethylene%2Fproducts%2Fcarbowaxp.htm&si=6019012419387392&pi=fd0f4423-7ac1-40b8-8baa-28c085394e40>.
Water soluble wax that we have used for masking parylene.
Lloyd Duso
Diamond-MT
Plant Manager
(814) 535-3505
www.Diamond-mt.com
On Mon, Sep 14, 2015 at 10:29 AM, Victor Hernandez <
[log in to unmask]> wrote:
> Fellow TechNetters:
>
> In a previous life, the other Big Blue, I used a product referred to as
> "Bees Wax" for mounting ICs onto a sample holder for polishing. A small
> amount of bees wax was melted and then the IC placed over it and let to
> dry. The IC would not move on the holder till reheated. Does anyone out
> there have a real name and part number for this product and where I can
> purchase it... I currently have a need to use it in a different
> application.
>
> Victor,
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>
______________________________________________________________________
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------------------------------
Date: Mon, 14 Sep 2015 10:57:50 -0400
From: Bhanu Sood <[log in to unmask]>
Subject: Re: Bees wax
Its basically a thermoplastic material used for mounting bare die, Crystalbond
is a trade name.
Make sure the Tg temperature of the thermoplastic doesn't degrade the part being
mounted.
On 9/14/2015 10:29 AM, Victor Hernandez wrote:
> Fellow TechNetters:
>
> In a previous life, the other Big Blue, I used a product referred to as "Bees Wax" for mounting ICs onto a sample holder for polishing. A small amount of bees wax was melted and then the IC placed over it and let to dry. The IC would not move on the holder till reheated. Does anyone out there have a real name and part number for this product and where I can purchase it... I currently have a need to use it in a different application.
>
> Victor,
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
--
Bhanu Sood
Center for Advanced Life Cycle Engineering (CALCE)
Test Services and Failure Analysis Laboratory
University of Maryland
Room 0128, 4298 Campus Dr. (Bldg. 88)
College Park, MD 20742 USA
Tel: +1 (301) 405 3498
Fax: +1 (301) 314 9269
e-mail: [log in to unmask]
Skype: calce_umd
website: www.calce.umd.edu/TSFA
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------------------------------
Date: Mon, 14 Sep 2015 15:04:04 +0000
From: Wayne Thayer <[log in to unmask]>
Subject: Re: Bees wax
Yes, there are several different temporary mounting adhesives available. The
water soluble one is useful for low temp apps.
Crystalbond - low to medium temperature, acetone strips residue
revAlpha - Dry process, versions made up to 150C, heat release, no residue
There's also a UV releasable material for temporary mounts on UV-transparent
glass. I haven't used it, but I believe it can go through reflow.
Wayne
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of lduso - Diamond-MT.com
Sent: Monday, September 14, 2015 10:36 AM
To: [log in to unmask]
Subject: Re: [TN] Bees wax
Sounds like something similar to Carbowax
<http://t.sidekickopen03.com/e1t/c/5/f18dQhb0S7lC8dDMPbW2n0x6l2B9nMJN7t5XYgdVhPKW4WYq3x5wvpw0W7fRL1x56dPnsf3Pj9QP02?t=http%3A%2F%2Fwww.dow.com%2Fpolyglycols%2Fpolyethylene%2Fproducts%2Fcarbowaxp.htm&si=6019012419387392&pi=fd0f4423-7ac1-40b8-8baa-28c085394e40>.
Water soluble wax that we have used for masking parylene.
Lloyd Duso
Diamond-MT
Plant Manager
(814) 535-3505
www.Diamond-mt.com
On Mon, Sep 14, 2015 at 10:29 AM, Victor Hernandez <
[log in to unmask]> wrote:
> Fellow TechNetters:
>
> In a previous life, the other Big Blue, I used a product referred to as
> "Bees Wax" for mounting ICs onto a sample holder for polishing. A small
> amount of bees wax was melted and then the IC placed over it and let to
> dry. The IC would not move on the holder till reheated. Does anyone out
> there have a real name and part number for this product and where I can
> purchase it... I currently have a need to use it in a different
> application.
>
> Victor,
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or
> [log in to unmask]
> ______________________________________________________________________
>
______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
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------------------------------
Date: Mon, 14 Sep 2015 15:27:04 +0000
From: "Stadem, Richard D." <[log in to unmask]>
Subject: Re: Board with Nickel/Gold plating
Glad I helped someone!
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ravinder Ajmani
Sent: Thursday, September 10, 2015 5:28 PM
To: [log in to unmask]
Subject: Re: [TN] Board with Nickel/Gold plating
Hi All,
My thanks to all of you who responded to my post and provided great information. Richard, the article for which you provided the link is excellent.
Regards
Ravinder Ajmani
HGST, a Western Digital company
[log in to unmask]
5601 Great Oaks Parkway
San Jose, CA 95119
www.hgst.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Thursday, September 10, 2015 2:54 PM
To: [log in to unmask]
Subject: Re: [TN] Board with Nickel/Gold plating
There are many good articles out there describing the effects of ENIG on signal loss, and whether or not to mask prior to or after plating the lines. Here is one that you might find helpful, but there are many.
http://www.icd.com.au/articles/Surface_Finishes_PCBD-June2014.pdf
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Thursday, September 10, 2015 4:47 PM
To: [log in to unmask]
Subject: Re: [TN] Board with Nickel/Gold plating
Because this is a high-speed measurement board, please understand that the nickel plating will contribute to a somewhat more lossy circuit due the skin effect. The nickel thickness thus is a critical factor to consider.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mattix, Dwight
Sent: Thursday, September 10, 2015 4:33 PM
To: [log in to unmask]
Subject: Re: [TN] Board with Nickel/Gold plating
Sounds like an ENIG finish at those thickness for Au and Ni. That should be specified as SMOBC (soldermask over bare copper). Last thing before legend (aka silkscreen).
Expect 1.8 - 2 mils finished copper on outerlayer. That assumes starting with 1/2 oz foil and a only single plating cycle (standard Class 2 copper in via and not special extra copper rqmts for VIPPO, pressfit or such).
If those are isolated traces they can plate much thicker due to increased current density. To avoid that be sure to add thieving or allow your supplier to thieve the outer layers to minimize that variation. Just keep make sure they keep back an acceptable distance to avoid creating an unintentional coplanar waveguide (3x or 5x dielectric height).
dw
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ravinder Ajmani
Sent: Thursday, September 10, 2015 2:11 PM
To: [log in to unmask]
Subject: [TN] Board with Nickel/Gold plating
Hi Experts,
I am designing a high-speed measurement board. The board will have a dozen high-speed signals connected to 2.92 mm connectors. The signal traces will be routed on the Top layer with through vias at the two ends. I have been advised to plate the signal traces with 3 - 10 microinches of Gold over 100 microinches of Nickel. Solder Mask/Conformal Coat will not be applied over the signal traces and via pads. No components need to be soldered to the signal traces, and 2.92 mm connectors will be screwed to the board.
I am trying to get an understanding of the board fabrication process to determine the finished thickness of the signal traces. This will help me figure out the trace impedance. I will appreciate if you can provide answers to the following:
* The starting Copper thickness for the Top/Bottom layers will be 0.6 mils (1/2 oz). Will Top/Bottom layers still go through the normal plating process.
* At what stage will Nickel and Gold be plated on the board. Also is it plated on the entire board surface or only the exposed locations (signal traces and vias).
* Is solder mask applied in the final stage (after the ENIG process).
* What is the expected finished thickness of the signal traces. I was informed by the Fab personnel that this will be about 2 mils.
Thank you very much for your help.
Regards
Ravinder Ajmani
HGST, a Western Digital company
[log in to unmask]<mailto:[log in to unmask]>
[HGST Logo]
5601 Great Oaks Parkway
San Jose, CA 95119
www.hgst.com
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------------------------------
Date: Mon, 14 Sep 2015 18:30:14 +0300
From: Brian Ellis <[log in to unmask]>
Subject: Re: Bees wax
If you bee-hive yourself, you could wax lyrical over the merits of honey
as a temporary adhesive. It may give you a buzz - or a sting!
On 14/09/2015 17:29, Victor Hernandez wrote:
> Fellow TechNetters:
>
> In a previous life, the other Big Blue, I used a product referred to as "Bees Wax" for mounting ICs onto a sample holder for polishing. A small amount of bees wax was melted and then the IC placed over it and let to dry. The IC would not move on the holder till reheated. Does anyone out there have a real name and part number for this product and where I can purchase it... I currently have a need to use it in a different application.
>
> Victor,
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>
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------------------------------
Date: Mon, 14 Sep 2015 18:15:00 +0000
From: "Nutting, Phil" <[log in to unmask]>
Subject: Re: Bees wax
Brian, well Deweyized!
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Monday, September 14, 2015 11:30 AM
To: [log in to unmask]
Subject: Re: [TN] Bees wax
If you bee-hive yourself, you could wax lyrical over the merits of honey as a temporary adhesive. It may give you a buzz - or a sting!
On 14/09/2015 17:29, Victor Hernandez wrote:
> Fellow TechNetters:
>
> In a previous life, the other Big Blue, I used a product referred to as "Bees Wax" for mounting ICs onto a sample holder for polishing. A small amount of bees wax was melted and then the IC placed over it and let to dry. The IC would not move on the holder till reheated. Does anyone out there have a real name and part number for this product and where I can purchase it... I currently have a need to use it in a different application.
>
> Victor,
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or
> [log in to unmask]
> ______________________________________________________________________
>
______________________________________________________________________
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End of TechNet Digest - 11 Sep 2015 to 14 Sep 2015 (#2015-173)
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