I am drawing a footprint of a 4PDT, the holes are 0.8 x 2.0mm. When I draw the footprint, should I draw the same dimension as the layout (I am scared that the real component might not fit the board), or make it a bit bigger, if so, can you suggest the value I should use? Thank you guys so much.

 

Hope to get you guys advice

 

hi duy,
Where do you see 0.8mm and 2.0mm?

I usually added 5% or 10%
E

 

hi duy,
Where do you see 0.8mm and 2.0mm?

I usually added 5% or 10%
E
View attachment 309688

I mean the hole for the lug solder.

So the size of these holes ideally are appx 0.88x2.2 mm, right? Thank you so much

 

hi duy,
I thought you meant the mounting holes for the switch body.

Do you have an actual switch on the bench to check the fit for the terminals?

E

 

hi duy,
I thought you meant the mounting holes for the switch body.

Do you have an actual switch on the bench to check the fit for the terminals?

E

yes, I have it. Do you mean I should measure the size of the lug solder to make sure it fits the layout? Please tell me if I misunderstood something. Thank you so much!!

 

Hi,
For a part of that type, I would just double-check the dimensions.
Before laying out my PCB artwork.
E

 

Check with the PCB manufacturer if the specified hole size is the drill size or the finished hole. The finished hole will be narrower than the drill size.

 

Check with the PCB manufacturer if the specified hole size is the drill size or the finished hole. The finished hole will be narrower than the drill size.

And if it's finished holes, then I will add like 5 - 10 % as ericgibbs says above, but for the drill ones, just keep it, right? Thank you so much!

 

Check with the PCB manufacturer if the specified hole size is the drill size or the finished hole. The finished hole will be narrower than the drill size.

Thank you so much for your advice!!

 

And if it's finished holes, then I will add like 5 - 10 % as ericgibbs says above, but for the drill ones, just keep it, right? Thank you so much!

No. You have that wrong.
If the drill size is specified, the finished hole diameter will be reduced by about 4mil (0.004" or 0.1mm).
You still want to increase the hole size by about 5-10% plus 4mil. For larger components such as connectors and switches I would prefer to have a larger hole than a hole that is too small.

 

I got it now, thank you so much!

No. You have that wrong.
If the drill size is specified, the finished hole diameter will be reduced by about 4mil (0.004" or 0.1mm).
You still want to increase the hole size by about 5-10% plus 4mil. For larger components such as connectors and switches I would prefer to have a larger hole than a hole that is too small.

 

Hi,
For a part of that type, I would just double-check the dimensions.
Before laying out my PCB artwork.
E

Thank you so much for your advice!

 

Also, don't go by the 2.00 mm alone. The corner-to-corner measurement will be greater.
In this case, I think a 2.20 mm finished hole will be fine.

 

I am drawing a footprint of a 4PDT, the holes are 0.8 x 2.0mm. When I draw the footprint, should I draw the same dimension as the layout (I am scared that the real component might not fit the board), or make it a bit bigger, if so, can you suggest the value I should use? Thank you guys so much.
View attachment 309687

The pins can vary in size.
Somewhere on the diagram it should state what the tolerance's are. That will provide guidance on the size of the hole.

 

Sometimes I make a hole D=2.2mm. Sometimes I make a slot that is 1x2.2mm.
Have you tried to find a readymade footprint for the switch?