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MSD Control

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Gav

#36776

MSD Control | 22 September, 2005

Hi All, I have been tasked with a project on the control of moisture sensitive devices and I was hoping to get some input from the experts out there... How do you monitor total exposure time for a MSD? If the packaging has been opened and re-sealed a few times, etc.

Thanks,

Gavin

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Rob

#36777

MSD Control | 22 September, 2005

Hi Gavin,

Depends on what MSD class, but in general for the more sensitive parts if they've been opened & not used within the time limit it's rebake, add dessicant & seal.

Our distribution side splits them down into more manageable/production size quantities on receipt, then bakes & seals before shipping to customers.

N.B. levels are as follows (IPC/JEDEC J-STD-020C):

1 = unlimited exposure 2 = 1 year 2a= 4 weeks 3 168 hours 4 = 72 hours 5 = 48 hours 5a = 24 hours 6 = time specified on label

Hope that helps,

Rob.

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#36778

MSD Control | 22 September, 2005

You need to account for the time and exposure of each MSD component during your production processes. * Barcodes * Software * Procedures * Training * Etc

Francois Monettet [fmonette at cogiscan.com ] at Cogniscan [ cogiscan.com ] is a frequent contributor here on SMTnet on this topic. He can help you.

We have no relationship, nor receive benefit from the company referenced above.

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Gav

#36781

MSD Control | 22 September, 2005

The main problem that we have is the packaging for the MSD's can be opened and re-sealed a number of times before it hit's production, then it is opened again to be loaded into the machine and most of the time these parts are not consumed so they are re-sealed again. So it can be a nightmare to record total exposure time. What systems/ideas have you guys seen or heard of anything that can track this? Be it paper or system based.

Thanks,

Gavin

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Rob

#36786

MSD Control | 22 September, 2005

Stick a label on the package with the initial opening time and date & the use by time, then check before using again.

Use the disposable indicator cards - if the are attached top the waffle packs they are getting the same exposure.

Get your suppliers to split into batch quantities for you on expensive parts.

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DasonC

#36817

MSD Control | 23 September, 2005

If you can, store the excess components in a dry box which can maintain below 5%.

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#36961

MSD Control | 4 October, 2005

There is a system out there called Humitel from Brock Electronics. I havn't used it but saw it at Apex. You may want to call them to find out more about it. From what I know they have a sensor that attaches to the tray or reel that will constantly monitor exposure.

Their contact number is: 905-954-0505

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telenbaas

#36970

MSD Control | 4 October, 2005

The indicator cards only show the current humidity, not the peak. They will revert back to blue if placed in dry conditions.

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Rob

#36975

MSD Control | 5 October, 2005

Sorry for the miss-understanding - there are at least 2 types of MSD cards - reversible & non reversible. We use the non-reversible type. Once exposed they record the max humidity through a one way chemical reaction.

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fmonette

#36978

MSD Control | 5 October, 2005

Hi Gavin,

I know that this is not the place for commercial information but somebody mentioned something about automated tracking systems and I would like to make you aware that Cogiscan also offers such a system.

I can also point you to a couple of technical articles that have been published on this subject :

1. Tracking MSDs for Improved Process Control - EP&P, Feb.2002 http://www.reed-electronics.com/semiconductor/index.asp?layout=article&articleid=CA195048&industryid=3026

2. Should you Automate Control of MSDs? - Solectron - Circuits Assembly, May 2002 http://www.cogiscan.com/documents/0205solectron.pdf

3. Improved Control of MSDs - Celestica - EM&T, March 2003 Ihttp://www.emtonthenet.net/elecoutsource/200303March/technicalarticle_EO_Celestica.htm

4. Control MSD for double-side reflow applications - Delphi - SMT Magazine, November 2003 http://smt.pennnet.com/Articles/Article_Display.cfm?Section=Archives&Subsection=Display&ARTICLE_ID=191294

Do not hesitate to contact me if you would like additional information on this subject.

Best Regards,

Francois Monette Cogiscan Inc. Tel : 450-534-2644 fmonette@cogiscan.com

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#37185

MSD Control | 17 October, 2005

#37187

MSD Control | 17 October, 2005

Visit Proof Of Design's website and download free documentation, including MSD, ESD, and so much more, covering almost everything PCB and PCBA/SMT. http://www.moonmanondarkside.com.

Earl Moon MoonMan

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