[SI-LIST] Re: Antw: Embedded uStrip - double check me
- From: "David Hoover" <dhoovy@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sun, 9 Nov 2003 22:20:44 -0800
Bill,
I too wish that I could find good numbers for LPI Soldermask. Unfortunately,
only a couple of soldermask suppliers give us values in the GHz ranges. One
of
the most common used in the US, Taiyo, only has 1 MHz values on their Tech
Data Sheets. Enthone has some graphs that suggest around ~4.0 value at 1
GHz.
Has anybody seen better values for Taiyo PSR4000 (LPI Soldermask)?
Regards,
Regards,
David Hoover
Sr FAE - Multek
PS-I've been hounding these guys for years on this! I'm just grateful that
the
soldermask has a very minor impact on the impedance calculations.
----- Original Message -----
From: "bdempsey85" <bdempsey85@xxxxxxxxxxx>
To: <weirsp@xxxxxxxxxx>; <RNowak@xxxxxxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
Sent: Thursday, November 06, 2003 8:16 AM
Subject: [SI-LIST] Re: Antw: Embedded uStrip - double check me
> Steve,
>
> The vendor is using Isola FR406 which has a Dk of 4.29 @ 1GHz. I am not
> sure about the coating values he's using.
>
> Anyone have good numbers for LPI soldermask coatings?
>
> Bill
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]
> > On Behalf Of steve weir
> > Sent: Thursday, November 06, 2003 2:01 AM
> > To: RNowak@xxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Re: Antw: Embedded uStrip - double check me
> >
> > What frequency is that Er number at, and frequency is your vendor
> using
> > for
> > his Er value for both the board and the coating?
> >
> > Regards,
> >
> >
> > Steve.
> > At 08:48 AM 11/6/2003 +0100, Robert Nowak wrote:
> > >Hello Bill,
> > >
> > >I calculate your microstrip line with Hyperlynx 7.0 and get Z0 = 53.6
> > >ohm.
> > >
> > >Regards,
> > >Robert
> > >
> > >
> > > >>> "bdempsey85" <bdempsey85@xxxxxxxxxxx> 11/06 1:40 >>>
> > >I would like a double check on my coated uStrip impedance
> > >calculations.
> > >I am getting feedback from my PCB fabricator that my numbers are >10%
> > >off.
> > >
> > >Here are the parameters:
> > >5 mil wide trace, 0.5 foil with add'l 1oz plating (approx 2.1 mils
> > >thickness)
> > >4 mil trace to plane, Er ~ 4.3
> > >LPI soldermask ~ 0.8 mils thick
> > >
> > >I compute 51 ohms...how about you?
> > >
> > >Thanks,
> > >Bill
> > >
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