Dear Ms. Hartley,
J-STD-020D.1 states in the scope:
1.1 Scope This classification procedure applies to all non-hermetic solid state Surface Mount Devices (SMDs) in packages, which, because of absorbed moisture, could be sensitive to damage during solder reflow. The term SMD as used in this document means plastic encapsulated surface mount packages and other packages made with moisture-permeable materials. The categories are intended to be used by SMD producers to inform users (board assembly operations) of the level of moisture sensitivity of their product devices, and by board assembly operations to ensure that proper handling precautions are applied to moisture/reflow sensitive devices. If no major changes have been made to a previously qualified SMD package, this method may be used for reclassification according to 4.2.
This standard cannot address all of the possible component, board assembly and product design combinations. However, the standard does provide a test method and criteria for commonly used technologies.
I believe connectors, even though they may not contain silicon die (which was never a requirement for MSD classification, by the way) fall under the category “plastic-encapsulated surface mount packages and other packages made with moisture-permeable materials” and are “commonly used technologies”
I may be wrong, and I am sure if I am the IPC will correct me, but I don’t believe my highly-esteemed colleagues in J-STD-020D.1 Group B-10a, JEDEC JC 14.1, nor JEDEC JC 14 ever intended to exclude connectors from these standards, because the industry connector users (the board assembly operations mentioned above) follow these standards, not MPD, which I have never heard of.
In any case I believe it is highly ingenious to disassociate Molex with the very industry standards their customers are most accustomed to using, and then attempting to do something “half-fast” such as put a small label on the reel inside of the package indicating the connector body “may” be damaged when subjected to normal reflow profiles.
If this were my product, and there was a danger of moisture permeation due to improper handling, packaging, and storage methods and resultant damage thereof, I would WANT to protect my customers and have them be well aware of the issue, and I would follow J-STD-033B.1 to the letter, and I would make darn sure that these Moisture Sensitive connectors were properly packaged in a vacuum-sealed moisture barrier bag with desiccant and Moisture Indicator Card inside, prominently labeled on the outside packaging with the MSD label and appropriate level clearly marked (as classified by J-STD-020), so they don’t end up with any “blistered” connector bodies or worse, a connector body that is less reliable than if the proper precautions had been known and observed beforehand.
It would put Molex in a far better light if they did so.
R. D. Stadem
From: Hartley, Ann [mailto:[log in to unmask]]
Sent: Wednesday, February 23, 2011 5:49 AM
To: Stadem, Richard D.; [log in to unmask]
Subject: FW: [TN] MSL on Connectors 87831 series
Please see below, I hope this helps.
Kind regards
Ann
Below mentioned MSL levels (details see here: http://en.wikipedia.org/wiki/Moisture_Sensitivity_Level ) originally are defined by JEDEC, a semiconductor company.
For semiconductors, MSL levels are very important because humidity creeps into the silicon!
Since the mentioned series concerns Milli-Grid headers, the plastic is Nylon 46 – see here from the drawing:
[cid:[log in to unmask]]
In our case there is no silicon, just pins and Nylon. This is why we do not define any MSL levels for our products.
The only issue which occurs with nylon products when ‘baked’ in a high temp enviroment is blistering.
So, our connectors are normally always MSL1.
It is more a subject to the soldering process where our MPD-colleagues sometimes advise to ‘dry’ our products before using them in a high-temp soldering-process.
In short: MSL is a measure for semiconductors and does not apply to connectors, which can be typically treated as MSL1
Hope this helps
-----Original Message-----
From: Stadem, Richard D. [mailto:[log in to unmask]]
Sent: 22 February 2011 13:30
To: Hartley, Ann
Cc: Amol Kane; TechNet E-Mail Forum
Subject: RE: [TN] MSL on Connectors
http://www.molex.com/pdm_docs/ps/PS-87831-027.pdf.
-----Original Message-----
From: Hartley, Ann [mailto:[log in to unmask]]
Sent: Friday, February 18, 2011 4:13 AM
To: Stadem, Richard D.
Subject: FW: [TN] MSL on Connectors
Good Morning Richard,
Can you please supply which part numbers you are interested in and I will pass it onto the relevant PM.
Thanks and kind regards
Ann
-----Original Message-----
From: Stadem, Richard D. [mailto:[log in to unmask]]
Sent: 17 February 2011 16:34
To: canada; amerinfo; mxaustria; mxuk; china; india; Japan; australia
Subject: FW: [TN] MSL on Connectors
-----Original Message-----
From: Stadem, Richard D.
Sent: Thursday, February 17, 2011 10:31 AM
To: [log in to unmask]; 'Amol Kane'
Subject: RE: [TN] MSL on Connectors
Amol, speaking as someone who has seen firsthand the results, I could not agree with you more! Molex, listen up!
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Amol Kane
Sent: Thursday, February 17, 2011 9:59 AM
To: [log in to unmask]
Subject: Re: [TN] MSL on Connectors
Thank you Eric!...I was surprised to say the least when I received such a reply from a big parts supplier such as Molex......anybody from Molex listening on this forum??
Based on the document you link me to, these are to be treated as MSL5!!.....very important detail to leave out from your packaging I would say
Amol
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Eric Christison
Sent: Thursday, February 17, 2011 10:03 AM
To: [log in to unmask]
Subject: Re: [TN] MSL on Connectors
/Unfortunately, Molex does not specify MSLs for our products./
.....and unfortunately we won't buy any any of your connectors then....
Logically they must at least know what the shelf life of the connectors is once they are removed from their packaging even if they don't comply with an MSL level.
I just had a search on Google for "Molex" and "MSL" and came up with the following data sheet: http://www.molex.com/pdm_docs/ps/PS-87831-027.pdf
If you look at the last page it does give you handling and storage requirements. Not very good ones, I don't see why that sort of device can't meet MSL3. Anyway, they must be able to give you the same sort of advice for the connector you're interested in.
Good luck!
--
Eric Christison
Consumer& Micro group
Imaging Division
STMicroelectronics (R&D) Ltd
33 Pinkhill
Edinburgh EH12 7BF
United Kingdom
Tel: +44 (0)131 336 6165
Fax: + 44 (0)131 336 6001
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