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Using Cans for EMI Shielding on Your PCB

Author : Date : 3/1/2019 3:07:31 PM
What is a can?
EMI can shields may also be called cans, cages, covers, or lids, depending on where you look for parts.
They are basically metal boxes that attach to your PCB to enclose part of the circuitry on the surface.
 
RF can shields are metal enclosures that help provide board level shielding
 
The metal used depends on your application and the price you’re willing to pay.
I recommend talking directly to a manufacturer to be sure you’ll get the right material for your product.
The usual options are:
 
Steel: Tin or zinc plated steel, stainless steel
Aluminum: Usually tin-plated aluminum
Brass
Copper alloys: Copper beryllium is especially common
Nickel
Silver
Tin plated plastic
 
 
The metal enclosure of the can keeps EMI from entering or leaving the covered region.
Many can shields have a grid of holes in the metal that helps with thermal management,
while still providing the shielding effect of a conductive cover over your components.