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February 2004

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Subject:
From:
Bernard Kessler <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 13 Feb 2004 07:30:37 -0800
Content-Type:
text/plain
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text/plain (221 lines)
What happened to the old  .047" thickness??
Bernie Kessler





At 07:19 AM 02/13/2004 -0500, you wrote:
>Okay...  let me rephrase my question.  What would be the most common
>laminate thicknesses for double-sided FR-4 material, around the .045" range.
>I know that I can get .031 and .062 material, is there anything in between
>that would be considered "standard" (readily available without added cost)?
>
>Jim Marsico
>Senior Engineer
>Production Engineering
>EDO Electronics Systems Group
>[log in to unmask] <mailto:[log in to unmask]>
>631-595-5879
>
>
>         -----Original Message-----
>         From:   Scott B. Westheimer [SMTP:[log in to unmask]]
>         Sent:   Thursday, February 12, 2004 7:33 PM
>         To:     [log in to unmask]
>         Subject:        Re: [TN] FR-4 standard thickness
>
>         Roger,
>
>         "Standard" means different things to different people. IPC does not
>specify
>         standard thickness for double sided or multilayer PCB's, that is
>left up to
>         the product designer to meet their product  fit, form and functions
>needs.
>         What is normally considered is material availability as a industry
>standard.
>         Certainly 0.062" thickness, in a lot of cases is used for double
>sided and
>         boards are designed around that thickness. However some designs and
>products
>         can not be that thick and therefore other material needs to be used.
>
>         Scott Westheimer
>
>         Colonial Circuits
>         ----- Original Message -----
>         From: "Roger Stoops" <[log in to unmask]>
>         To: <[log in to unmask]>
>         Sent: Thursday, February 12, 2004 5:18 PM
>         Subject: Re: [TN] FR-4 standard thickness
>
>
>         Okay, I have a "newbie" type of question:
>
>         What are the "standard" thicknesses for double-sided boards?
>
>         And then the type of questions I ask when it's been a rough week:
>
>         Who determines the standard?  Has IPC determined a standard?
>
>         I would like to know so I can tuck it away in my quickly growing
>files of
>         pcb flotsam and jetsam...
>
>         Have a good one! (Time to call it a day)
>
>         Roger M. Stoops, CID+
>         Trimble Navigation Ltd., Dayton, OH, USA
>         Ph: +01 937.245.5288
>         Fax: +01 937.233.7511
>
>
>         -----Original Message-----
>         From: TechNet [mailto:[log in to unmask]]On Behalf Of Scott B.
>Westheimer
>         Sent: Thursday, February 12, 2004 3:48 PM
>         To: [log in to unmask]
>         Subject: Re: [TN] FR-4 standard thickness
>
>
>         James,
>
>         This is not a standard thickness if you are taking about a double
>sided PCB.
>         However if it is a multilayer and depending on how many layers it
>has it is
>         possible to get your required thickness. Most likely if you are
>talking
>         double sided than it will either be specially made by a laminate
>         manufacturer or the PCB fabricator. If the laminator makes it, it
>might be
>         expensive depending on the quantity needed.. It might be best to
>allow the
>         fabricator to make the material as it should cost less.
>
>         Scott Westheimer
>
>         Colonial Circuits
>         ----- Original Message -----
>         From: "Marsico, James" <[log in to unmask]>
>         To: <[log in to unmask]>
>         Sent: Thursday, February 12, 2004 3:04 PM
>         Subject: [TN] FR-4 standard thickness
>
>
>         > Good day Technet:
>         > Our designers are designing a PWB using IPC 4101/24 (FR406)
>material
>         that's
>         > .045" thick.  Is this a standard thickness that is readily
>available?
>         >
>         > Jim Marsico
>         > Senior Engineer
>         > Production Engineering
>         > EDO Electronics Systems Group
>         > [log in to unmask] <mailto:[log in to unmask]>
>         > 631-595-5879
>         >
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>-----------------------------------------------------

Bernard Kessler & Associates, Ltd
714-898-8422  562-598-5563  Fx: 562-431-1741
www.home.earthlink.net/~bkesslerbka
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