FreeLists / pcdlist / [pcdlist] Fw: Re: Soldermask Registration.

["Bob Skelton" <bskelton@xxxxxxxxxxx>]

----- Original Message -----
From: "Dack.Kelly" <Kelly.Dack@xxxxxxx>
To: <pcdlist@xxxxxxxxxxxxx>
Sent: Friday, April 05, 2002 8:33 AM
Subject: [pcdlist] Re: Soldermask Registration.


>
> Robert,
>
> Accuracy of solder mask registration depends on your quality requirements.
> Many designers base their quality requirements on the class of electronic
> device that they are engineering described in IPC-A-600 (Acceptability of
> Printed Boards).
> Class 1 -- General electronic products...
> Class 2 -- Dedicated service electronic products
> Class 3 -- High reliability electronic products
>
> Based on the quality requirements defined in IPC-A-600, 0.05mm from the
edge
> of the solder mask to the hole for at least 180deg is acceptable for class
1
> devices, but NON-CONFORMING for class 2 and 3 devices.
>
> Once a quality requirement is established, it is a good idea to specify it
> in your fabrication notes ie: Acceptability per IPC-A-600, class X.
>
> Using a manufacturing acceptability spec such as IPC-A-600, gives the
> manufacturer a clear picture of your acceptability requirements before the
> boards are fabricated.
>
> -- Kelly
> Kelly Dack, CID
> IPC Certified Interconnect Designer
> Sr PCB Designer for:
> INTERNATIONAL GAME TECHNOLOGY (IGT)
> 9295 PROTOTYPE DRIVE
> RENO, NV 89511
> Ph 775-448-7033
>
>
>
>
> -----Original Message-----
> From: Rob Mongey [mailto:rmongey@xxxxxxxxxx]
> Sent: Friday, April 05, 2002 5:58 AM
> To: pcdlist@xxxxxxxxxxxxx
> Subject: [pcdlist] Soldermask Registration.
>
>
>
> Hi all,
> Can anyone tell me if Soldermask is allowed to encroach on an SMT
> pad or
> switch contact? My PCB vendor says it is allowed to do so, by a maximum of
> 0.05mm. Is this true?
>                                                       Regards,
>                                                            Rob Mongey.
>                                                          CAD Technician.
>
> Robert Mongey <rmongey@xxxxxxxxxx> Tel    : +353 (0)91 774300
> Bio Medical Research Direct : +353 (0)91 774338
> BMR House, Fax    : +353 (0)91 774302
> Parkmore Business Park West, Mobile : +353 (0)87 2485262
> Galway
> Rep of Ireland.
>
>
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