What is the Formula for distance between Two Trace

[ashish17]

what is  the formula for distance two trace worked on 3v3 ,one of them as signal and other is supply.
how i calculate the distance between these two trace

[Zero999]

There is no formula.

If you're talking about a 3.3V the creapage distance is so tiny you won't be able to get a PCB reliably manufactured which will cause any problems with creapage.

[KJDS]

and if you want to know how much coupling there is between them, then use Hammerstad and Jansens equations.

[mikerj]

Possibly the most vague opening post I've ever seen.

This might help, on the assumption you are worried about capacitive coupling
http://www.edn.com/electronics-blogs/bakers-best/4426162/PCB-signal-coupling-can-be-a-problem

[ashish17]

sir i have asked this questions in interview 

[con-f-use]

 

[ashish17]

thanks for your reply.
and this is basic for mi

if i start routing 3V3 supply track and one signal track, i dont know what is the clearance between this two track.
 

[wraper]

sir i have asked this questions in interview

 

[wraper]

thanks for your reply.
and this is basic for mi

if i start routing 3V3 supply track and one signal track, i dont know what is the clearance between this two track.

Minimum your pcb manufacturer allows if you are tight in space up to infinity, there is no formula. Of course if you don't do controlled impedance, however if you do, you need to know your target impedance first of all. And then it is not just distance to nearest track, but also pcb material and thickness, layers, track width, yada yada yada.

[tggzzz]

sir i have asked this questions in interview

I hope you mean you "have been asked this question in interview".

In that case your response should have been to enquire "formula for what?", e.g. capacitance, impedance, coupling, maximum voltage, manufacturability, etc.

[T3sl4co1l]

Quite possibly, something has been lost in translation...

[Simon]

Please do not post the same question three times!!!! 

[Jeroen3]

You can use the Saturn PCB Toolkit for all of your PCB related calculations.
http://www.saturnpcb.com/pcb_toolkit.htm

[dannyf]

What is the Formula for distance between Two Trace

X, where x is from -infinity to +infinity.

[suicidaleggroll]

What is the Formula for distance between Two Trace

42

[Simon]

How many thousands of years did that take to work out ?

[free_electron]

inner layer / outer layer ?
humidity ?
ambient air pressure ?
covered with soldermask or open ?
what noisemargin do you have ?
what impedance is the signal supposed to see ?
what core material do you use ?


do i need to go on ?

[dave_k]

what is  the formula for distance two trace worked on 3v3 ,one of them as signal and other is supply.
how i calculate the distance between these two trace

It's for same formula for working out how long is a piece of string.

x = (d/2) * 2

ie: twice the distance from one end to the middle.

[suicidaleggroll]

How many thousands of years did that take to work out ?

4000, of course.

[DavidDLC]

I start to dislike EEVBlog just for these type of comments your are making, the poster is trying to reach for help, maybe a problem with language ? and you come with stupid comments

[zapta]

I start to dislike EEVBlog just for these type of comments your are making, the poster is trying to reach for help, maybe a problem with language ? and you come with stupid comments

Well said.

[Simon]

I start to dislike EEVBlog just for these type of comments your are making, the poster is trying to reach for help, maybe a problem with language ? and you come with stupid comments

And it gets tiring when people join who are that childish that they have to post the same topic 3 times. I think the question was adequately answered, it has already been pointed out that for 3.3V there is no minimum as it will be well under the minimum clearance distance the pcb can be made to and others have asked for more detail but no reply.

[TheUnnamedNewbie]

And it gets tiring when people join who are that childish that they have to post the same topic 3 times. I think the question was adequately answered, it has already been pointed out that for 3.3V there is no minimum as it will be well under the minimum clearance distance the pcb can be made to and others have asked for more detail but no reply.

Isn't it quite likely he doesn't realise this? I think he has so much issues with the language he does not know exactly what he is saying, nor what the replies are trying to tell him. The attitude in many of the comments won't help with that either.

[suicidaleggroll]

Isn't it quite likely he doesn't realise this? I think he has so much issues with the language he does not know exactly what he is saying, nor what the replies are trying to tell him. The attitude in many of the comments won't help with that either.

Nothing will help with that, other than learning the language to a level at which he can form his question into a coherent sentence and understand and respond to questions presented to him.

[Simon]

anyone with limited english and the need to make multiple identical posts will not get far on here. For one multiple posts asking the same question will get you banned and for second whatever your first language is i bet it's not even anyone elses 2nd, 3rd, or 4th. This is an english speaking forum after all.