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Forum Does anyone know the value of Er of FR4?

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Does anyone know the value of Er of FR4?

COMPACT over 8 years ago

Does anyone know the value of Er of FR4?

0 michaelwylie over 8 years ago

Between 3.5 and 4.5. It is not controlled well. Do you need a substrate with tighter tolerance?
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0 D_Hersey over 8 years ago in reply to michaelwylie

If you do I recommend https://www.rogerscorp.com/index.aspx

I was able to talk them out of some their smanchy material for my kid's random-number-generator project for school.

Hi, MW!
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0 michaelwylie over 8 years ago in reply to D_Hersey

I recommend Rogers as well.
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0 COMPACT over 8 years ago in reply to michaelwylie

Not Isola?
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0 D_Hersey over 8 years ago in reply to COMPACT

I am not hip to them as a manufacturer of PCBs. Got a link?
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