[SI-LIST] FR4 Permittivity
- From: CHASTANG Cyril <cyril.chastang@xxxxxxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 21 Feb 2013 13:49:23 +0100
Apparently, the screenshot is invisible in my previous email. I have the
following data:
Grade: PLC-FR-370HR H/H(RTF)
Thickness: 0.004 in
Customer: SanminaSIN
Test Property | Unit | Condition
| Sampling | Test Results
| Specs
Dissipation factor | - | IPC-4101*A C-40/23/50 @1MHz
| 1/month | Ave: 0.007 [0.007 - 0.007] | 0.035
Diectric constant | - | IPC-4101*A C-40/23/50 @1MHz
| 1/month | Ave: 2.173 [2.173 - 2.173] | 0-5.4
Thank you.
Best regards,
Cyril
________________________________________________________
Hi,
I have recently received a PCB (dielectric= Isola PLC-FR-370HR) and its
certificate of compliance (extract below). The value of the material
permittivity given below is quite surprising (2.173) to be FR4. Is it the
effective permittivity for a microstrip? Is there a mistake in the certificate?
Have you ever seen a FR4 permittivity like that ?
Thank you for your help.
Cyril
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