Thank you for your responses .
It was very informative
Regards
Michel Arbour

> -----Original Message-----
> From: Arbour, Michel [SMTP:[log in to unmask]]
> Sent: Tuesday, July 08, 2003 10:48 AM
> To:   [log in to unmask]
> Subject:      [TN] Operating temperature of PCB
>
> Hello techies,
> We have a PCB that is subjected to high temperature during normal
> operation
> of the product (Power converter).
> - There is a heat-sink mounted directly on the PCB on the top side.
> - The Dimension of the PCB is : 8" X 3". The heat-sink dim. is : 2" X 4" .
> - There is mostly copper planes in the heat-sink  area of the PCB .
> - The temperature is measured at the bottom side of the PCB and the worst
> case temperature is 110C (around 245F) .
> - It is a 6 layer PCB thickness of 0.062" .We are using a high temp FR4 .
>
> Are there any chances of degradation of the PCB over time at these
> temperature.
> Any reliability issues to adress
> Is 175C Tg sufficient .
>
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