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### Author Topic: Thickness of pcb lines  (Read 9248 times)

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#### M_Ann

• Guest
##### Thickness of pcb lines
« on: September 01, 2008, 01:07:46 AM »
Hello friends

Is there a formula or a table (better a table)to choose what thickness to draw for pcb lines? You have a pcb that has a relay. From one side, there is power 6V100mA. A thin line of copper is ok. But from the other side of the relay, there might be 5amperes current for example. In this side, the line should be thicker. How much thicker should this be?

Thanx

#### Mercury

• Guest
##### Re: Thickness of pcb lines
« Reply #1 on: September 02, 2008, 22:32:21 PM »
What thickness of PCB do you use? The copper i mean.

#### M_Ann

• Guest
##### Re: Thickness of pcb lines
« Reply #2 on: September 02, 2008, 22:50:50 PM »
A normal one, i do not really know. How can i find it?

#### spic0m

• Global Moderator
• Hero Member
• Posts: 841
##### Re: Thickness of pcb lines
« Reply #3 on: September 02, 2008, 23:25:48 PM »
I think that suits you:
http://circuitcalculator.com/wordpress/2006/01/31/pcb-trace-width-calculator/

but you still need to know the thickness of the copper

#### kam

• Hero Member
• Posts: 1849
##### Re: Thickness of pcb lines
« Reply #4 on: September 03, 2008, 23:16:50 PM »
A normal one, i do not really know. How can i find it?

Well, a normal one would mean something like 1oz. (The copper in a PCB is rated in ounces, and represents the thickness of 1 ounce of copper rolled out to an area of 1 square foot.  For example a PCB that uses 1 oz. copper has a thickness of 1.4mils)

Use the calculator that spicom provided to get the thickness.
Do not be so inbounds. Make it a little bit thicker as you may not have 1oz...

#### M_Ann

• Guest
##### Re: Thickness of pcb lines
« Reply #5 on: September 05, 2008, 19:23:20 PM »
A normal one, i do not really know. How can i find it?

Well, a normal one would mean something like 1oz. (The copper in a PCB is rated in ounces, and represents the thickness of 1 ounce of copper rolled out to an area of 1 square foot.  For example a PCB that uses 1 oz. copper has a thickness of 1.4mils)

Use the calculator that spicom provided to get the thickness.
Do not be so inbounds. Make it a little bit thicker as you may not have 1oz...

I calculate 3mm. is ths enough?

#### spic0m

• Global Moderator
• Hero Member
• Posts: 841
##### Re: Thickness of pcb lines
« Reply #6 on: September 05, 2008, 19:24:29 PM »
Make it 5mm if you have space and it would be allright.

#### Supernova

• Moderator
• Full Member
• Posts: 149
##### Re: Thickness of pcb lines
« Reply #7 on: September 07, 2008, 10:00:54 AM »
Make it 5mm if you have space and it would be allright.

If you have that kind of space, 5mm are perfect. If you do not, you may also 4mm..