[PCB_FORUM] Re: Prepreg Breakdown Voltage

BamBam,
 
Also see IPC-2221A Table 6.1 Electrical Conductor Spacing. It covers
inner and outer layers, covered and uncovered at elevations for bare
boards
and assemblies.
 

Jerry 

        -----Original Message-----
        From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Cosentino, Tony
        Sent: Wednesday, February 15, 2006 10:44 AM
        To: icu-pcb-forum@xxxxxxxxxxxxx
        Subject: [PCB_FORUM] Re: Prepreg Breakdown Voltage
        
        
        Bambam,
         
        Pre-Preg Breakdown Voltage
        This data is available on the specific material datasheet for
the laminate you will be using. You should be able to find this data
under "Electrical Strength, min." and "Arc Resistance, min.". These
numbers usually describe volts per mil for a specific time and under
specific conditioning. I would not suggest designing a board to these
limits as these numbers describe electrical strength for a specific time
in seconds and we design boards, in most cases, to run for years. 
        To address your specific question, I am not sure if there is a
typical breakdown voltage as the specifications vary from laminate to
laminate. Just thumbing through a handful of datasheet I have in my
filing cabinet I have a range from 740 volts/mil to 1400 volts/mil for
times that vary from 60 seconds to 120 seconds. It is best to check your
specific material datasheet. Then design your product to survive within
the parameters expected.
        
        Thanks
        Tony Cosentino
        Tekelec - PCB Design Engineer
         

________________________________

        From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of
FranciscoMontoya@xxxxxxxxxxxxxxx
        Sent: Sunday, February 12, 2006 8:46 PM
        To: icu-pcb-forum@xxxxxxxxxxxxx
        Subject: [PCB_FORUM] Prepreg Breakdown Voltage
        
        

        Hello, 
        
        I would like to know if there's a typical breakdown voltage of a
pressed prepreg material. If you can provide a site regarding this
matter will be most appreciated. 
        
        thanks 
        bambam

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