Ryan,
What a novel way of looking at the problem! But read what we got from the supplier today and you will see that for sure they are talking about solderability, although I am not entirely sure I know what they mean. What strikes me as weird is that they say they can beat the living daylight out of these things from a humidity/temperature point of view, yet don't have enough data to change the out of bag spec from 168 hours?!!!!! It is sounding more and more like Mike Fenner is right and someone has their "knickers in a knot".
regards,
Bev
The edge of XXXXXX products are round-shape (not like chip
resistors, which is edgy),
One of the reason for
specifying time for the usage is this and along with Tin lead finish (could
cause oxidation) may affect mountability and solderability
As for the oxidation, we know the case that there was no solderability issue at 30C/70%RH for 500 hours and 25C/60%RH for 1000 hours.
Although, there are not enough factors to revise our current specification.
--------------------------------------------------------Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: July 24, 2003 5:08 PM
To: [log in to unmask]; Bev Christian
Subject: RE: [TN] Short Solderability Time LimitsHi Bev,I would hazard to say that this is a language translation error, because of course, there is a "LIFETIME for the ABILITY to mass SOLDER" moisture sensitive devices without *damage*. Now convey this concept into two concise words in Japanese and you might say something about the toilette. As a matter of fact, being the end of the day, I can think of a good way to express such a concept in just a couple of words in english.Ryan Grant-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: Wednesday, July 23, 2003 8:39 AM
To: [log in to unmask]
Subject: Re: [TN] Short Solderability Time LimitsSokkhon, Paul, others,Well the supplier's spec sheets AND the label on the bag say the same thing - solderability time limit. This is from one of the largest off-shore electronics manufacturers in the world. Is there still a chance they are completely wrong ? Yeeees, but it doesn't look good. We are investigating. And also asking if this is true, why?Rudy, good question about the finish. It is tin over nickel over silver. I don't know the thicknesses - yet.regards,Bev ChristianResearch in Motion--------------------------------------------------------Original Message-----
From: Sokkhon Ou [mailto:[log in to unmask]]
Sent: July 23, 2003 8:10 AM
To: TechNet E-Mail Forum.; Bev Christian
Cc: [log in to unmask]
Subject: Re: [TN] Short Solderability Time Limits
You will find all detail about MSD in IPC/JEDEC-J-033A. It talk about moisture not soldering.
Bev Christian <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>07/22/2003 04:43 PM
Please respond to "TechNet E-Mail Forum."; Please respond to Bev Christian
To: [log in to unmask]
cc:
Subject: [TN] Short Solderability Time Limits
Technetters,
As if we didn't have enough problems with really, really old parts; part numbers; moisture sensitivity; a few instances of stupid finishes as suppliers go lead free; but now I have a new one - for me anyways. We have received virgin parts where the label on the bag says they only have a SOLDERABILITY LIFETIME of 168 hours after they are taken out of the bag! This is not a case where one can recover them by putting them in an oven afterwards! Anyone else seeing this new pain-in-the-neck development?
regards,
Bev Christian
Research in Motion
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