New IEC 61760-4 – Surface Mount Technology

IEC 61760-4, “Surface mounting technology – Part 4: Classification, packaging, labelling and handling of moisture sensitive devices,” has just been released.  The new standard extends the classification and packaging methods included in J-STD-020 and J-STD-033.  It is intended to be used for these types of components where the two J STD’s are not required or appropriate.

It’s been developed because the mandated use of lead-free solder alloys has resulted in higher tempertures during reflow soldering processes.  So the sensitivity of components to this heat when being exposed to moisture before soldering has become an increasingly important factor.  While other standards have addressed this problem for plastic encapsulated semiconductors and the like, there has been no guidance for other types of components.

IEC 61760-4 is used for devices intended for reflow soldering (like surface mount devices) including specific through-hole devices.  It provides you with a classification system for such moisture sensitive devices.  These moisture sensitivity levels are related to soldering heat.  Packaging, labeling and handling requirements for each level are then issued.

However, you will not use IEC 61760-4 for semiconductor devices themselves.  Nor will you use it for devices for flow (wave) soldering.

Your standard is divided into various clauses, starting with the usual scope, referenced documents and definitions sections.  The body of the IEC 61760-4 covers the following 6 topics:

  • General information,
  • Assessment of moisture sensitivity,
  • Test procedures,
  • Requirements for packaging and labeling,
  • Handling moisture sensitive devices, and
  • Drying.

There are also 4 informative annexes.  Annex A covers moisture sensitivity of assemblies, Annex B is on mass/gain loss analysis, Annex C is for the baking of devices, and Annex D reviews moisture sensitivity labels.  A 13-item bibliography completes the document.

As I’ve noted before, IEC standards are covered by the laws of copyright and need to be purchased from an authorized distributor like Document Center Inc.  Go to the Document Center webstore at www.document-center.com and order your copy in either paper format or for pdf download.  Or go straight to the order page for IEC 61760-4 right now!  Should you prefer, all IEC standards are available as part of our Standards Online subscription service for multi-user access.  Just get in touch with our staff by phone (650-591-7600), fax (650-591-7617) or email (info@document-center.com) for more information.  (Want to take a look at our service?  Just register at demo.document-center.com).

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Claudia Bach

Claudia Bach is the President of Document Center Inc. and a world-wide recognized expert on Standards and Standards Distribution. You can connect with her on Google+

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