PCB Substrate

[v3xation]

If anyone has a bit of time and patience for digging:

I need info on the PCB substrate and metal from OSHPark (the purple stuff).

Things I really need to know if at all possible:

• Thickness of substrate
• Weight/thickness of copper
• Tan_d of substrate (loss characteristic)
• Relative permittivity (eps_r) * Most important *
• Layout tolerances

If you can find complex permittivity over some specified frequencies (wishful thinking) that would be best and I can extract the loss tangent from it.

Post info here or email me if anyone gets to this, thanks!

[maksschmidt]

I can do some digging later on tonight, I'll try to get everything tonight

[maksschmidt]

No luck finding the info directly, I logged a support ticket to get the information from them.

[kblu]

See the datasheet (in datasheet folder) labeled FR-4 OSHPARK for additional info. http://support.oshpark.com/support/solutions/articles/136707-2-layer-board

The 2 layer board uses a IS-410 compatible FR4 high temperature substrate, with a dialectric constant of 4.6 at 1MHz. This substrate is compatible with a lead-free process. The boards are .063 inches (1.6mm) thick, with 1oz (35um) copper on both sides.

The formal board stackup is
1mil solder resist (+/-0.2mil) 1.4mil copper 60mil FR4 substrate (+/-10%) 1.4 mil copper 1 mil solder resist (+/- 0.2mil)

[kblu]

I also left an information request with myro pcb. This manufacturer is a lot more reliable than OSHPARK and can get boards here in ~5 days if needed. Myro uses thicker copper, higher tolerances on layout. They will also be way cheaper if we pannelize the boards for quantity.

[v3xation]

Design was simulated and completed using info here and on the datasheet provided. Hopefully their specs are close to accurate.