PCB Stackup

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PCB Stackup
« on: May 01, 2017, 09:02:39 AM »
Hi,

It's a great design!

What is the PCB stackup that you used for the layout, i.e.:

1. PCB thickness
2. Layer to layer thickness
3. Copper thickness
4. Dielectric material

Thanks

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Dejan

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Re: PCB Stackup
« Reply #1 on: May 01, 2017, 05:28:29 PM »
Hi

1.) PCB thickness: 1.6 mm
2.) Layer order: F, In1, In2, B.
     Layer to layer thickness: F to In1 (B to In2) = 0.18 mm, In1 to In2 = 1.1 mm
3.) Copper Weight: 35 um (1 oz)
4.) Dielectric material: FR4

You can use other stack-ups, but adjust line width and spacing of the USB differential pair (D+/D-) to achieve ~90 Ohm differential impedance.

Re: PCB Stackup
« Reply #2 on: May 02, 2018, 05:59:46 PM »
Hi

1.) PCB thickness: 1.6 mm
2.) Layer order: F, In1, In2, B.
     Layer to layer thickness: F to In1 (B to In2) = 0.18 mm, In1 to In2 = 1.1 mm
3.) Copper Weight: 35 um (1 oz)
4.) Dielectric material: FR4

You can use other stack-ups, but adjust line width and spacing of the USB differential pair (D+/D-) to achieve ~90 Ohm differential impedance.

could you please take a look at my Summary for your PCB from JLC PCB :
PCB prototype:Y1
Gerber file - Gerbers_Y1
Build Time - 96 hours
Layers:4
Dimension: 160mm*100mm
PCB Qty:10
PCB Thickness:1.6
PCB Color:Green
Surface Finish:HASL(with lead)
Copper Weight:1
Gold Fingers: No
Material Details:FR4-Standard Tg 140C
Panel By JLCPCB: No

Thanks

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Dejan

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Re: PCB Stackup
« Reply #3 on: May 04, 2018, 12:30:08 PM »
PCB specifications looks OK.
You also need to know layer stack details (layer to layer spacing) in order to adjust D+/D- pair trace width to achieve ~90 Ohm differential impedance.
You can use online PCB tools to calculate trace impedance, for example: https://www.eeweb.com/tools/edge-coupled-microstrip-impedance