Are mounting holes plated?

Are mounting holes plated?

Mounting holes can generally be divided into two types: Supported: Plated mounting holes which generally get tied to the ground plane. Unsupported: Non-plated mounting holes which are never connected to a ground plane layer and require an outer keep-out zone to isolate it from other components and traces.

What is non-plated through hole?

Non-plated through holes are simple features that are either drilled or milled through your circuit board, which expressly do not receive a plating of conductive copper. Typical uses of NPTH features are mounting holes to allow screws or other fasteners to pass through your board.

What is a plated PCB?

Plating on a PCB refers to the electrochemical process by which a metal is deposited onto the surface of the circuit board, and inside the plated through-holes. The most common plated metal in PCB fabrication is copper.

What is the required hole fill of a plated through-hole?

Solder fillets are smooth and shiny with concave profiles. Populated plated through holes (PTH) should exhibit a vertical solder fill of 100%, with a fully formed fillet on the solder side, and evidence of 100% wetting on the component side lead, barrel and pad.

Does a hole have to go all the way through?

Depending on the material and the placement, a hole may be an indentation in a surface (such as a hole in the ground), or may pass completely through that surface (such as a hole created by a hole puncher in a piece of paper). In engineering, a hole may be blind or through if it is partial or complete depth.

What is the difference between plated through hole and non plated through hole?

Through-hole technology, also spelled “thru-hole” are holes that go completely through the boards. They can be plated (PTH) or non-plated (NPTH). With plated through holes there is a conductive path from one side of the board to the other, as seen on Figure 1.

What are the two standard plating techniques in PCB?

There are four main types of plating methods in PCB (Printed Circuit Board) production: finger-plated plating, through-hole plating, reel linkage selective plating and brushing plating.

Do you need ground for plated PCB mounting holes?

Grounded PCB mounting holes can reduce EMI. Connecting plated mounting holes to chassis ground is a best practice, but it isn’t the only best practice to adhere to. To ensure that your device is protected, your chassis ground must be connected to a proper earth ground.

Can a non plated mounting hole be used?

Using non-plated mounting hole with vias eliminates the placing/removing kapton tape step assuming that these non-plated mounting holes have their bottom pad covered with soldermask. This was suggested to me many years ago from a board assembler contractor.

How are mounting holes connected to the ground?

In addition to plating, mounting holes can also have an annular ring or copper pad that may or may not have its own ring of vias that also connect to the ground plane. Why connect your mounting holes to ground?

When do I need to plate the holes on my Motherboard?

If the screw is used to ground the board (for example, PC motherboards) then plated is the way to go- this one has the top, bottom and internal ground plane tied together with many small vias radially around the hole. There is no thermal relief on the vias.