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November 2005

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Subject:
From:
"Chezhian, Krishnan" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Chezhian, Krishnan
Date:
Mon, 21 Nov 2005 15:18:25 +0800
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Hi Anil,



Again this depends on the end application after DIG plating - if it is for
SMT soldering then it should be a competitive finish. However it depends on
the shelf life as if it is kept longer the copper intermetallics may grow &
cause solderability problems.......



Krishnan

SANMINA-SCI



  _____

From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Monday, November 21, 2005 3:05 PM
To: 'Chezhian, Krishnan'; 'TechNet E-Mail Forum'
Subject: RE: [TN] best plated surface finish - DIG



Krishnan



That is old tech. we have been flogging it for years. But last month Gerard
O'Brien introduced a new finish from China - DIG - direct immersion Gold -
he says it is compact at 2 to 4 micro inches and is quite free from
porosity.



I was looking for more info on this.



Anil Kher



  _____

From: Chezhian, Krishnan [mailto:[log in to unmask]]
Sent: Monday, November 21, 2005 12:23 PM
To: TechNet E-Mail Forum; [log in to unmask]
Subject: RE: [TN] best plated surface finish

The flash gold as mentioned by Lee below is an electrolytic process & is
usually plated over nickel & not copper. If it is going to be used for SMT
soldering purpose the 2microinches of flash gold is good enough, but if it
is for wire bonding or contact fingers then the gold thickness is too
low.....



Thanks,

Krishnan

SANMINA-SCI

Quality Assurance / NPI Manager

E-mail: [log in to unmask]

Phone (Off): 082-363000 Ext. 1602

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-----Original Message-----
From: Anil Kher [mailto:[log in to unmask]]
Sent: Monday, November 21, 2005 2:32 PM
To: [log in to unmask]
Subject: Re: [TN] best plated surface finish



Dear lee



I  understand the new version of flash gold is direct immersion on copper.



Is that correct. Has it been tested extensively?



Anil Kher

micro interconnexion pvt. ltd

D3-12A, Corlim Industrial Estate

Corlim, Ilhas , Goa , India 403110

tel: 91-832-2284209/337. fax 2284209/2285271

e mail: [log in to unmask]

Leaders in Gold plated PCBs - selective/ cob

an ISO 9001-2000 Company





-----Original Message-----

From: Lee parker [mailto:[log in to unmask]]

Sent: Monday, November 21, 2005 1:16 AM

Subject: Re: best plated surface finish



Jerry



Hope all is well with you.



I did not mention immersion silver since it has been discussed at length in

this forum and most are ware that I am a huge advocate of immersion silver

going bask to 1995 when I installed the first such line in North America at

the AT&T plant in Richmond.



I mentioned Flash Gold because it is a relatively new coating (in its

present format) and is just beginning to catch the attention of the OEMs.



Best regards



Lee



J. Lee Parker, Ph.D.

JLP Consultants LLC

804 779 3389

----- Original Message -----

  From: Gerald Gagnon<mailto:[log in to unmask]>

  To: [log in to unmask]<mailto:[log in to unmask]>

  Sent: Friday, November 18, 2005 6:28 PM

  Subject: Re: [TN] best plated surface finish





  Lee



  Kudos from a long time lurker......



  You're absolutely correct. Many many years of OEM experience with this

  finish. Lots of fear over purported high cost of gold. There's a few

  "application" secrets but it is the ultimate surface finish.



  Now that the cat is out of the bag, how come you didn't mention immersion

  silver?





  Gerry Gagnon





  From: Lee parker <[log in to unmask]<mailto:[log in to unmask]>>

  Reply-To: TechNet E-Mail Forum <[log in to unmask]<mailto:[log in to unmask]>>,

Lee parker

  <[log in to unmask]<mailto:[log in to unmask]>>

  To: [log in to unmask]<mailto:[log in to unmask]>

  Subject: Re: [TN] best plated surface finish

  Date: Wed, 16 Nov 2005 08:25:34 -0500



  John



  Another option is flash gold over nickel. Both are plated inline using an

  electrolytic process(as opposed to ENIG). The gold thickness is roughly

two

  micro inches. The OEMs that I am familiar with that have used this finish

  have reported very good results.



  Most of the PCB suppliers providing this process are in China.



  Best regards



  Lee



  J. Lee Parker, Ph.D.

  JLP Consultants LLC

  804 779 3389

  ----- Original Message -----

     From: Babcock

John<mailto:[log in to unmask]<mailto:[log in to unmask]>>

     To:

[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]<mailto:TechNet

@IPC.ORG>>

     Sent: Tuesday, November 15, 2005 7:28 PM

     Subject: [TN] best plated surface finish





     If somebody wants an extra smooth plating finish using lead free

plating

     what material would they use...and what would be the finishing process?

     I've heard HASL is sort of rough...and it really doesn't apply using

     silver solder because of the melting temps.

     Is ENIG (electroless nickel immersion gold) the way to go to get a

     smooth finish?



     thanks!



     John Babcock

     PCB Designer III

     Isothermal Systems Research (ISR)

     2218 N. Molter Rd

     Liberty Lake, WA 99019



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