Hi Steve-

A press-fit is a swage connection. This means that due to scraping (for
cleaning) and interface pressure (due to the connector pin deforming)
results in clean surfaces with more than sufficient contact pressure
maintained to prevent moisture (or other contaminant) from infiltrating to
the metallic interface where it can create insulative oxides.

That was a mouthful!

Anyway, if you understand that mouthful, it is apparent that the board
needs to be thick enough to maintain pressure on the section of the pin
which is designed to be collapsed. You can grab a connector and use a set
of calipers to get a pretty good idea for where the pin begins to exceed
the hole diameter. Scratch that point and then measure how far from the end
of the pin that is. That is the minimum amount which must protrude from the
bottom of the board post-insertion.

Wayne Thayer

On Thu, Aug 22, 2019 at 7:17 PM Tan Geok Ang <[log in to unmask]> wrote:

> "too thin" the PCB, the wall of the press-fit holes might crack but if it
> is the customers who define the stack-up and design the PCB, they will have
> to study into the per pin insertion force (and total number of pins within
> each compliant pin connector, too) to ensure it meets connector supplier
> specification. E.g. Tyco VPX connector will goes for 25um to 50um copper
> wall thick.
>
> -----Original Message-----
> From: TechNet <[log in to unmask]> On Behalf Of Bhanu Sood
> Sent: Friday, 23 August 2019 6:21 AM
> To: [log in to unmask]
> Subject: Re: [TN] Minimum PCB thickness for press-fit technology?
>
> The IPC 5-21M Committee which is developing the IPC-9797 press-fit spec
> "recommends" a 1.5-4mm board thickness.
> Design and acceptability criteria may require a thicker or thinner board.
>
> On Thu, Aug 22, 2019 at 4:05 PM Steve Gregory <[log in to unmask]> wrote:
>
> > Hi all!
> >
> > I thought I'd throw the question out there while I'm google-ing for
> > it, is there a minimum PCB thickness that you would want to use
> > press-fit technology? I'm thinking it's .062", I think I read that
> > somewhere, now I'm trying to find it. But a .031" thick PCB seems too
> thin. Thoughts?
> >
> > Steve
> >
> > --
> > Steve Gregory
> > Kimco Design and Manufacturing
> > Process Engineer
> > (208) 322-0500 Ext. -3133
> >
> > --
> >
> >
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