What is a 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 thru hole?
The most common embedded component in a printed circuit board (PCB) is a plated through hole (PTH), which serves as a conductive conduit from one layer of the board to another. They are created by drilling a hole in the board and plating the inside with a conductive material, usually copper.
Why do the punched holes get plated with conductive material?
The chemical solutions and the process are designed to have a good “throwing power” in order to evenly plate copper within the via holes. Once the copper is fully plated on the surface of the board and in the holes, tin is plated on top of that as an etch resist.
What is the required hole fill of a plated through hole?
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. The solder joint surface is smooth, nonporous and undisturbed, with a finish varying from satin to bright.
What is plated through-hole in PCB?
Through holes on a PCB refer to a hole that is drilled from the top and through to the bottom of a PCB, these can be plated (PTH) or non-plated (NPTH). Through holes became plated-through holes (PTH) in order for the components to make contact with the required conductive layers.
What is the difference between through-hole and surface mount soldering?
Through-hole mounting is the process by which component leads are placed into drilled holes on a bare PCB. Whereas SMT components are secured only by solder on the surface of the board, through-hole component leads run through the board, allowing the components to withstand more environmental stress.
What is the difference between a blind hole and a through-hole?
A blind hole is a hole that is reamed, drilled, or milled to a specified depth without breaking through to the other side of the workpiece. A through hole is a hole that is made to go completely through the material of an object. In other words, a through hole is a hole that goes all the way through something.
What is plated through hole in PCB?
Should PCB mounting holes be plated?
Mounting holes should generally be plated as this allows mounting with metal screws. Because floating bits of metal can be sources of EMI, the mounting holes should be connected to some ground net (earth (PE), signal ground (SGND), a grounded enclosure, etc.).
What is the maximum amount of acceptable lead damage?
OSHA set a Permissible Exposure Limit (PEL) for lead in workplace air of 50 µg/m3 (8-hour time weighted average). OSHA mandates periodic determination of BLL for those exposed to air concentrations at or above the action level of 30 µg/m3 for more than 30 days per year.
Non-Plated Through Hole (NPTH): From its name, this type of through holes no copper plated onto the walls of the holes, so the barrel of the hole has not electrical properties. They were very popular when printed circuits only has copper traces printed on one side, but their use decreased as the number of layers in PCBs increased.
What is the difference between plated and non-plated through holes PCBs?
This is not the case with the non plated holes and hence plated through holes are more beneficial than non plated through hole joints. Other differences include the cost and area. Plated through holes PCB is more costly than the non-plated through hole PCB. And plated through holes PCB consumes less space/area than the non-plated through hole PCB.
What is the meaning of through hole technology?
DEFINITION. 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 is plated-through hole (PTH)?
Plated-Through Hole (PTH): The main characteristic of PTH is that, during the manufacturing process, after drilling, the boards a thin copper layer is plated onto the walls of the holes, providing them with electrical conductivity.