Custom Electronic Printed Circuit Board PCB Assembly Services Oem Other Multilayer PCB

What is Multilayer PCBs

In a typical four-layer stack up, to improve the electromagnetic compatibility (EMI) performance, the signal layers should be spaced as close to the planes and use a large core between the power and ground plane. The tight coupling between signal trace and ground plane often reduces the plane impedance which further reduces the common-mode radiation from the cables connected to the printed circuit board. Also, the close trace to plane coupling will decrease the crosstalk between traces.

PCB Sideplating

Sideplating is the metalization of the board edge in the PCB filed.

Edge plating,plated contour, side metal, these words can also be used to describe the same function.

Half-cut Castellated Holes

Castellations are plated through holes or vias located in the edges of a printed circuit board.

Are indentations created in the form of semi-plated holes on the edges of the PCB boards.

These half holes serve as pads intended to create a link between the module board and the board that it will be soldered onto.

Parameters

• Layers: 8L multilayer pcb
• Board Thinkness:2.0mm
• Base Material:S1000-2 High tg
• Min Holes:0.2mm
• Minimum Line Width/Clearance:0.25mm/0.25mm
• Minimum Clearance between Inner Layer PTH to Line: 0.2mm
• Size:250.6mm×180.5mm
• Aspect Ratio:10 : 1
• Surface treatment:ENIG+ Selective hard gold
• Process characteristics: High tg, Sideplating, Selective hard gold, Half-cut Castellated Holes
• Applications: Wi-Fi modules

FQA

1. What is hard gold in PCB?

The Hard Gold surface finish, also known as Hard Electrolytic Gold, is composed of a layer of gold with added hardeners for increased durability, plated over a barrier coat of nickel using an electrolytic process.

2. What is hard gold plating?
Hard gold plating is a gold electrodeposit that has been alloyed with another element to alter the grain structure of the gold to achieve a harder deposit with a more refined grain structure.

The most common alloying elements used in hard gold plating are cobalt, nickel or iron.

3. What is the difference between Enig and hard gold?
ENIG plating is much softer than hard gold plating.

Grain sizes are about 60 times larger with ENIG plating, and hardness runs between 20 and 100 HK25.

ENIG plating holds up well at only 35 grams of contact force or less, and ENIG plating typically lasts for fewer cycles than hard plating.

A popular trend among manufacturers is board-to-board soldering.

This technique allows companies to produce integrated modules (often containing dozens of parts) on a single board that can be built into another assembly during production.

One easy way to produce a PCB that is destined to be mounted to another PCB is to create castellated mounting holes.

These are also known as "castellated vias" or "castellations."