Screaming Circuits: IPC-A-610 Class III Assembly


IPC-A-610 Class III Assembly

The Screaming Circuits website will now offers instant online quoting and ordering of prototype and short-run production PCB assembly built and inspected to IPC-A-610 Class III standards. By default, Screaming Circuits assembles and inspects to IPC-A-610 Class II, but with the new capability, the higher reliability standard can be quoted and ordered just as easily.

Just what is IPC Class III and why should you care? IPC-A-610 covers workmanship for electronic assemblies - the boards you design and get built up. The higher the number, the more stringent the build and inspection requirements are. Class II is the general commercial standard: items produced and inspected to IPC-A-610 Class II are deemed quality for typical commercial applications. Class III are deemed to be appropriate for hi-reliability and mission critical applications.

For most prototype and small volume applications, IPC Class II workmanship and inspection will be just fine. However, for some with tighter reliability requirements, e.g. aerospace, military, medical, harsh environments, class III workmanship and inspection may be required. Class III service is available as an option on the Screaming Circuits "Full Proto" and "Short-Run" assembly services.

Duane Benson


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Hi Bob - The Class 2 and Class 3 designations that I refer to are IPC certified workmanship and inspection standards.

The standards cover things like component alignment on the pads, quality of the solder joint, and similar aspects of the manufacturing process. Class 3 holds to tighter tolerances than Class 2.

Class 3 workmanship does not mean that an item is certified for use in aircraft or other life-critical systems.

There's a lot more to life-critical certification than just workmanship. However, life-critical systems tend to require Class 3 workmanship and inspection.

I am confused about IPC-A-610 Class 2 and 3 assembly. what I have search till now I found that Class 3 is used in aerospace. The Class or standard followed in Aircraft is what the OEM will use in the design submitted to the FAA and has nothing to do with IPC-A-610. Can you plz explain me detail?

Thank you for your charing, Great post.


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