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August 2012

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Subject:
From:
George Milad <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Wed, 15 Aug 2012 08:11:37 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (135 lines)
Hard gold is alloyed with Co, Ni or Fe at about 3%.  It is harder than  
soft gold which is pure gold.
Soft gold may be electroplated, immersion gold of ENIG is also soft  gold.
Both soft and hard gold are solderable. Too much gold thickness could  
impair the solder joint reliability.
Hard gold is not gold 
wire bondable.
 
Best Regards 
George Milad
Chairman IPC Plating Committee
Nat'l Accts Mgr for Technology
Uyemura International corp
516 901  3874
 
In a message dated 8/15/2012 4:36:04 A.M. Eastern Daylight Time,  
[log in to unmask] writes:

Hi  everyone,
MIL-G-45204 is the military specification for electrodeposited  gold 
plating.
I hope it helps.
Sefika Ozkal Piroglu 
Aselsan - MGEO  Division

-----Original Message-----
From: TechNet  [mailto:[log in to unmask]] On Behalf Of R Sedlak
Sent: Tuesday, August 14,  2012 9:43 PM
To: [log in to unmask]
Subject: [TN] Hard vs. Soft  gold

It is my understanding that both hard and soft gold are  electroplated.
The difference is that "soft gold" is essentially pure,  whereas "hard gold"
is highly alloyed, often with Cobalt, to harden  it.
Rudy Sedlak
RD Chemical Company

--- On Tue, 8/14/12, Guy  Ramsey <[log in to unmask]> wrote:

From: Guy Ramsey  <[log in to unmask]>
Subject: Re: [TN] PCB finish: ENIG vs. hard  gold
To: [log in to unmask]
Date: Tuesday, August 14, 2012, 11:32  AM

I am not sure I can talk to hard or soft gold, and suitability  for
soldering. 
But, I can say that it is possible to solder to  electroplated gold, which 
is
different from Immersion Gold finish. 
I  think some people say hard gold when they mean electroplated gold. 
There  is a brief discussion of this in Coomb's Handbook.
Guy

-----Original  Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Glidden,  Kevin
Sent: Tuesday, August 14, 2012 12:12 PM
To:  [log in to unmask]
Subject: [TN] PCB finish: ENIG vs. hard gold

Hi  everyone,

We have a PCB supplier who is offering "Hard Gold" as an  alternate to ENIG
finish, due to PCB size and processing  capabilities.  The application is
Class 3 (mil/aero).  The  circuit is thin FR4 and subject to SMT reflow w/
Sn63Pb37 (non RoHS) solder  alloy, and moderate flexing in end application.

Can anyone offer info  on the differences between the two finishes, and/or
their  suitability?  Is there an IPC spec (or specs) that outline  "hard
gold"?

Thanks,

Kevin  Glidden


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######################################################################
Dikkat:

Bu  elektronik posta mesaji kisisel ve ozeldir. Eger size 
gonderilmediyse  lutfen gondericiyi bilgilendirip mesaji siliniz. 
Firmamiza gelen ve giden  mesajlar virus taramasindan gecirilmekte, 
guvenlik nedeni ile kontrol  edilerek saklanmaktadir. Mesajdaki 
gorusler ve bakis acisi gondericiye ait  olup Aselsan A.S. resmi 
gorusu olmak zorunda  degildir.

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Best  Regards 
George Milad
Nat'l Accts Mgr for Technology
Uyemura  International corp
516 901  3874




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