Doug,
You're right. Just like a backward poet writes in verse. You verified I did make a mistake (/26 instead of /126). What is real embarrassing is /126 and /129 along with several others are the ones I had added to IPC-4101 when I was the Chair, rather than under the table as I am now.
Dewey

From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Thursday, May 09, 2013 7:35 AM
To: Whittaker, Dewey (EHCOE)
Cc: TechNet E-Mail Forum
Subject: RE: [TN] Operating temperatures

Well Dewey, even a blind squirrel finds an acorn every now and then.  A broken clock is always right twice a day....

Doug Pauls



From:        "Whittaker, Dewey (EHCOE)" <[log in to unmask]<mailto:[log in to unmask]>>
To:        TechNet E-Mail Forum <[log in to unmask]<mailto:[log in to unmask]>>, "[log in to unmask]<mailto:[log in to unmask]>" <[log in to unmask]<mailto:[log in to unmask]>>
Date:        05/09/2013 08:42 AM
Subject:        RE: [TN] Operating temperatures
________________________________



Doug doing PB laminate speak? What's next; humor?
I have to agree with my esteemed colleague. Laminates that meet IPC-4101/26 or 29 would probably work in both those temperature ranges and it eliminates the need for polyimide.
Dewey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, May 09, 2013 5:15 AM
To: [log in to unmask]<mailto:[log in to unmask]>
Subject: Re: [TN] Operating temperatures

A high quality FR4 with a Tg in the 175C range will work for #2, but I think you need polyimide to work up to 200C.

Doug Pauls



From:   Pradeep Menon <[log in to unmask]<mailto:[log in to unmask]>>
To:     <[log in to unmask]<mailto:[log in to unmask]>>
Date:   05/09/2013 06:09 AM
Subject:        [TN] Operating temperatures
Sent by:        TechNet <[log in to unmask]<mailto:[log in to unmask]>>



We have a requirement specified in the master drawing of couple of PCBs which indicate that the operating temperatures as below.

1.            -50°C to 200°C operating PCB.
2.            -40° to 150°C operating PCB.

Will a high Tg material FR4 meet this requirement. Or will Polyimide be required. Any general inputs on this since we could not find the operating temperature in the TDS of the materials

Rgds

Pradeep

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