Dang John...you're a poet and we didn't even know it!

-Steve- 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: Monday, May 14, 2007 3:07 PM
To: [log in to unmask]
Subject: [TN] NTC RE: [TN] SV: [TN] SMT connectors

After the down turn and RoHS......................................

In a factory, long ago
The quality white coats come and go
They know their stuff its plain to see
The factory produces QUALITY

The accountants took over to make us recover They chased bottom line dollars and now it's all over All that glitters really is gold The electronics break before they get old

And now my friends it's plain to see
We need some old fashioned QUALITY
Kick out the "fast fix" and let engineers in With Metallurgists, Chemists and once again then

With careful selection, and sections and testing The connectors will work with everyone's blessing Good bye brittle fracture and early life crash Lets all make our voice heard "we don't want to build trash..."

John


 
 
John Burke
 
(408) 515 4992

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord
Sent: Monday, May 14, 2007 12:35 PM
To: [log in to unmask]
Subject: [TN] SV: [TN] SMT connectors

You are right, don't underestimate gold on SMT connectors. Remember the pictures I sent long ago on microwave transistors with 10 micrometers of gold on the leads? The IMCs became so prevalent that the components dropped off the boards if you knocked them a little. I've seen similar for connectors (SMA/SMB). Once upon the time, long, long ago,  there was a wonderful little corner at all manufacturing plants, full of microscopes, and gauges, and precision measuring tools, and feet of standards on the shelves, and men and women in white and with a sign on door...guess what you read on those signs ?....QUALITY CONTROL. 

Inge

-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Steve Gregory
Skickat: den 14 maj 2007 19:48
Till: [log in to unmask]
Ämne: Re: [TN] SMT connectors

Hi Richard!

I understand what you are saying, but I'm seeing more and more SMT connectors out there (especially from Samtec) that are finishing them with flash gold that is next to impossible to remove the gold. 

The company that I talked about in my original post gave up trying....and they really tried. Brought their oxygen analyzer out to try and get the 02 levels down over the wave they use to remove the gold at their place, and got it down to 25ppm. The stupid connector still bridged. Even tried to give it a little physical shock (by tapping it) immeadiately after the wave to try and knock the bridges loose, but no joy. They're returning the connectors back to me and rejecting the job.
The problem is the grounding strip the runs down the middle of the connector.

So I'm stuck...unless I want to try and tin these things by hand and use some solder wick to remove the bridges. I know that ain't gonna happen.

I wonder if Samtec bothers to read the J-STD when they create these things? I also wonder if they would guarantee that there won't be any issues without removing the gold? I might just call them and see what they say...

-Steve Gregory-

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Monday, May 14, 2007 8:55 AM
To: [log in to unmask]
Subject: Re: [TN] SMT connectors

Bogert,
Some of us to wish to continue with this requirement.
The requirement was put there for a very good reason. I would be very, very careful when changing it. You will need to qualify any new parameters fully, to cover every lead/pad configuration that currently exists by implication. 

If any amount of gold is added to a solder joint, some corresponding nucleation is going to take place.

I would recommend a Class 1, Class 2, Class 3 type of arrangement, with Class 3 being the current standard listed in J-STD-001DS (none allowed in the area to be soldered, period). But I would also recommend a reference to a test method and a reference to a %-by-volume calculation method for the Class 1 and Class 2 levels. Too many people are out there soldering gold parts and then adding a 5 lb weight or some type of shear test immediately afterward and saying "it did not break, therefore I have 'subjective proof' of no gold embrittlement issues". 

Ignoring the time variable happens because there is no definition of what "subjective proof" is.

The Space Addendum (J-STD-001DS) requires all gold be removed in the area to be soldered. Again, there are good reasons for this. This portion of the standard should not be taken lightly or changed without full qualification.
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of - bogert
Sent: Sunday, May 13, 2007 11:03 AM
To: [log in to unmask]
Subject: Re: [TN] SMT connectors

It is true that J-STD-001 currently requires gold to be removed from all SMT components.  However, I am not sure we want to continue with this requirement in J-STD-001.  Since the advent of RoHS, and even before this, folks have manufactured millions of parts with gold finish.  As long as the quantity of gold in the completed solder connection is not causing gold embrittlement, I think we need to revise the requirements.
I am making a comment to our Task group who is currently developing revision E of the standard.


>From: "Dehoyos, Ramon" <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>,
"Dehoyos, 
>Ramon" <[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: [TN] SMT connectors
>Date: Tue, 8 May 2007 08:54:11 -0400
>
>
>	Steve:
>	Yes, gold must be removed from SMT parts regardless. In a static

>solder pot, it is very difficult, but fine pitch parts can be replated 
>by a miniwave with a N2 blanket. There is no need to dip it twice 
>neither due to the fact that the melt is moving.  It works very well 
>and it is done fast and no bridging.
>	Regards,
>	Ramon
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
>Sent: Monday, May 07, 2007 3:15 PM
>To: [log in to unmask]
>Subject: Re: [TN] SMT connectors
>
>Hi Phil!
>
>We don't make choices regarding SMT connectors, our customers do, and I

>can tell you I've seen a lot of different styles.
>
>There's one thing about them that I've seen lately that I really don't 
>like, and it's mainly the SMT connectors that come from Samtec. Lately,

>they been coming out with some high-density fine pitch designs that are

>flash gold plated (RoHS compliant!), and that's the ONLY WAY you can 
>get them now. Flash gold is the RoHS finish of choice it seems for
Samtec.
>But now to comply with the J-STD, you must remove gold no matter what 
>the thickness on the solderable surfaces of SMT parts...right?
>
>I've sent some samples of QSE and QTE series connectors to a company to

>see if they can tin and remove the gold them for me. I hope they can, 
>but they may not be able to without a lot of bridging because of the 
>design of the connector. http://www.samtec.com/ftppub/pdf/QTE.PDF I 
>just know I don't want to try and do it myself.
>
>I think this connector was a bad choice as far as reliability is 
>concerned (but I'm not the customer). These connectors are being used 
>to interconnect and stack with other boards, and there's no mechanical 
>support built into the connector other than the grounding strip that 
>runs down the middle of the connector. Plus we're putting down the big,

>tall -07 lead style connectors (they're almost 1-inch tall!)
>
>So really look at the connectors carefully. There's a lot out there and

>they may seem like the perfect answer to eliminate a process step...but

>be careful!
>
>-Steve Gregory-
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
>Sent: Monday, May 07, 2007 11:05 AM
>To: [log in to unmask]
>Subject: [TN] SMT connectors
>
>Hi Techies,
>
>What choices have you made regarding SMT connectors?
>
>We are designing some new SMT boards and could put SMT connectors on to

>reduce or eliminate a wave or hand solder step.  I am looking at 
>D-subminiature connectors and 0.100 on center ribbon connectors.  Each 
>are available in SMT.  My concern is that the SMT is less durable in a 
>high usage or high vibration/shock environment.  Saving a step isn't 
>worth it if it created more long term failures.
>
>Thanks in advance.
>
>Phil
>
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