Stacked PCB Insulation

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drkidd22

Member

• Jun 4, 2012

• #1

Hello,

I have a small 3x4 PCB that mounts on top of a bigger main board. The small PCB has some through hole components. What I'm trying to figure out is what kind of tape insulator would be good to use on the bottom solder side of the small PCB to insulate it. As to prevent the solder from scratching any traces that may be on the main PCB which could cause a short. Doesn't need to be high temp.

 

Last edited: Jun 4, 2012

3v0

Coop Build Coordinator

Forum Supporter

• Jun 4, 2012

• #2

I would use standoffs instead.

 

alec_t

Well-Known Member

Most Helpful Member

• Jun 4, 2012

• #3

Rigid standoffs, as suggested, would be best if you have the space needed. Failing that, how about sticky foam pads (stacked as necessary to give good clearance between the boards)?

 

K

kubeek

Well-Known Member

Most Helpful Member

• Jun 4, 2012

• #4

alec_t said:

Rigid standoffs, as suggested, would be best if you have the space needed. Failing that, how about sticky foam pads (stacked as necessary to give good clearance between the boards)?

Click to expand...

I don´t think those are a good idea, they will suck moisture and might throw everything off.
In SMPS supplies you may often see thin and hard HDPE foil such that you can´t easily punch it through, this one would be ideal to use.

 

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drkidd22

Member

• Jun 4, 2012

• #5

Can't use standoff, trying to stay away from having to modify the main board. I need to use some kind of mylar tape or something like that.

 

K

kubeek

Well-Known Member

Most Helpful Member

• Jun 4, 2012

• #6

If you can get hands on kapton or mylar that might be ok too, just use enough layers.

 

ChrisP58

Well-Known Member

Most Helpful Member

• Jun 4, 2012

• #7

How is the small board attached to the bigger board? Is it by short bare wires soldered at each end?
If so, and if they are straight, you might use short pieces of plastic tubing to act as standoffs.
Bivar makes some parts for that purpose.

**broken link removed**

 

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drkidd22

Member

• Jun 4, 2012

• #8

kapton is what I think I will use. board is attached with pins soldered on main pcb