IPC-SM-840C - 3.4.10. Minimum thickness is sufficient to withstand 500 VDC....
Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302
Voice - 802.257.4571 ext 37
Fax - 802.257.0011
<http://www.vtcircuits.com/>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of arnaud grivon
Sent: Monday, January 29, 2007 8:02 AM
To: [log in to unmask]
Subject: Re: [TN] Soldermask Types implied in IPC-D-325A
Gary,
Could not find any requirement on solder mask thickness in the IPC-6012
Rev. B specification.
The only paragraph I am aware of dealing with solder mask thickness is
the 3.7.3 which states that "solder resist thickness is not measured
unless specified in the procurement documents. If a thickness
measurement is required, instrumental methods may be used or assessment
may be made using a microsection of the parallel conductors on the E
coupon." This seems to apply for all IPC classes.
Regards,
Arnaud Grivon
Gary Ferrari a écrit :
> The IPC-D-325 has not been revised in several years and it"s
> replacement is current in work. To be in accordance with current
> specifications, all that is necessary, in addition to the type of mask
> you wish to use and the sides to apply it to, is to specify that the
> mask meet IPC-SM-840, Type T or H. If you wish a specific mask
> thickness, then specify it as well. Only class 3 of IPC-6012 specifies
> a minimum soldermask thickness.
>
> Regards,
>
> Gary Ferrari
> FTG Circuits
> Director, Technical Support
> 860-350-9300
>
> Andrew Clifford wrote:
>> I am currently working on the notes section of a new PCB design and
>> was pointed towards the examples section in IP-D-325A for some
>> suggested notes on the choice of soldermask. The note I have been
>> asked to use is:
>>
>> "Construction to be SMOBD, using liquid photoimageable (LPI) solder
>> mask material, type XXXX. Apply to both external layers in accordance
>> with IPC, (Type B, Class 2). Use appropriate solder mask artworks for
>> each side of board."
>>
>> I am aware that "Type B, Class 2" has now become Type H (well, Class
>> 3, but that is what we are using), but my question is this:
>>
>> What is the "Type XXXX"? I haven't been able to find much information
>> at all in my searches. I found a series of posts on here from 1998,
>> in which types B1 and B2 are mentionned, but a source for these was
>> never disclosed.
>>
>> If these are the types in question, I would be very grateful if
>> someone could let me know the source of them, as my quality control
>> guys will insist on a source if i put it down!!!
>>
>> Thanks very much for any help you can offer.
>>
>> Andrew Clifford
>> Systems Engineer
>> BAE Systems
>> Plymouth, UK
>>
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