Yes to all that, Its not just the board material - Sn63 might be a bit iffy
seeing as how it melts at 183C. You will need to understand more than just
the operating temperature. What is the duty cycle?
...Continuous exposure to a high temperature is very different to cycling to
that temperature, also the dwell times at either end - and the design life,
and the time in use in that design life. 

Best Wishes
 
 
 
Mike

What is the final device and what is its expected service environment? I
would confirm the operating temperature range with the customer before I did
anything else. Ask them if they meant capable of withstanding those
temperatures for reflow purposes, not operating temps. Operating
temperatures would normally be on the assembly or final device requirements,
not the PWB fab drawing. If they are the required operating temperatures,
then the question is for how long must they operate at those temperatures,
and then you have many other issues to deal with besides the PWB material.
You would need to validate that each and every component on the BOM can also
operate at those temperatures, and the same for all materials used (epoxies,
conformal coating, etc,). With the exception of oven profiling equipment or
combustion monitoring equipment or something of that sort (and those are
usually thermally insulated), those "operating" temperatures are extremely
harsh and unusual. The listed temperatures may also be ESS test
temperatures, as the general range for those would be the same except
Fahrenheit, not Celsius. 

I must emphasize, talk to your customer.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pradeep Menon
Sent: Thursday, May 09, 2013 6:09 AM
To: [log in to unmask]
Subject: [TN] Operating temperatures

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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