PCB Edge Plating FR4 ENIG 1u' 4 Layer PCB

Basic Information
Place of Origin: China
Certification: UL
Model Number: 04B2302176
Minimum Order Quantity: 1pcs/lot
Price: negotiable
Packaging Details: Vacuum package in bubble wrap
Delivery Time: 15 working days
Payment Terms: T/T
Supply Ability: 1kkpcs/month
Detail Information
Layer Count: 6 Layer Material: FR4
Board Thickness: 1.0mm Surface Treatment: ENIG 1U'
Solder Mask Color: Black Board Size: 103*125.9
Special Feature: PCB Edge Plating FR4 ENIG 1u' 4 Layer PCB

Product Description

PCB Edge Plating FR4 ENIG 1u' 4 Layer PCB


PCB Specifications: 


Part NO: 04B2302176

Layers: 4Layer

Surface Finished: Immersion gold 1u'

Material: FR4

Thickness: 1.0mm

PCB Size: 103 * 125.9 mm

Finished copper: 1OZ

Solder Mask colour: Black

Silkscreen colour: White

Special Features: PCB edge copper plating/matalization on three sides of the circuit board

Standard: IPC-A-600G Class II
Certificates: UL/94V-0/ISO



Our Product Categories:


Our Product Categories
Material Kinds Layer Counts Treatments
FR4 Single Layer HASL Lead Free
CEM-1 2 Layer/Double Layer OSP
CEM-3 4 Layer Immersion Gold/ENIG
Aluminum Substrate 6 Layer Hard Gold Plating
Iron Substrate 8 Layer Immersion Silver
PTFE 10 Layer Immersion Tin
PI Polymide 12 Layer Gold fingers
AL2O3 Ceramic Substrate 14 Layer Heavy copper up to 8OZ
Rogers, Isola high frequency materials 16 Layer Half plating holes
Halogen free 18 Layer HDI Laser drilling
Copper based 20 Layer Selective immersion gold
  22 Layer immersion gold +OSP
  24 Layer Resin filled in vias





Q:what is PCB edge plating?


PCB Edge Plating: Metalizing Circuit Board Edges via Electroless Copper Plating

PCBs continue to evolve to enhance their performance, connectivity, compactness, durability, etc. One of the ways they have developed is to include edge or side plating. It is a simple metallization process that gives immense benefits. We will look at PCB edge plating to explain how you can design and build this technical feature into your circuit board. Let's get started.


What is PCB Edge Plating?


PCB edge plating refers to the copper plating or metallization of the sides of a circuit board. And it can be on at least one board edge. These metalized outer edges enhance the board's rigidity to reduce equipment failure, especially on tiny boards, such as Bluetooth and WiFi modules.


A LAN module chip with edge plating on a small section


Also, this metal edging creates a strong connection through the circuit board and has a surface finish that provides an electrical connection. Electroless Nickel Immersion Gold (ENIG) is the preferred surface finish due to its durability and smooth, even finish.


Variations of Edge Plating


The metalized edges can take any of the following four forms.


Wraparound Edge Plating


Wraparound plating involves routing the metalized edge along the sides after drilling. The routing process exposes the PCB sidewall to electroless base copper plating for simultaneous application when applied to the drilled holes.

This base layer creates a conductive surface on which you can place a thicker, more durable copper layer via electroplating (for better adhesion).


An illustration of the copper electroplating process


Castellated Edge Plating (Board Edge PTH)


With castellated edges, the plating does not cover the entire board edge. Instead, it plates holes drilled on the perimeter and extends to the perimeter edge for routing.


A Bluetooth module with castellated edge plating on two sides


Therefore, this plating type is best for boards requiring peripheral connections. And the peripheral devices can be slaves or modules that augment the main board's performance.


Copper Up-To-Board Edge


This edge plating type maintains a minimum distance between the copper features and the PCB edge. The space can be either of the following.

  • 0.45mm on all layers with V-scoring
  • 0.25mm on outer layers and 0.4mm on inner layers with break-routing

Only use the copper-to-board edge distance where slight copper damages won't interfere with the board's performance. And the tracks should not be within this distance.


Round Edge Plating


Round edge plating involves metalizing the side from top to bottom. It establishes solid grounds for metal casing or shielding purposes. The production process for this edge plating type involves milling followed by thru-hole plating.


An NVMe M2 SSD PCB with edge plating on the upper side


It is impossible to do 100% continuous metallization around the sides because you must hold the board in the production panel when processing. So there must be gaps for route tabs. And selective chemical nickel-gold is the recommended surface finish for this type.


How To Design An Edge-Plated PCB


Define the plated copper area using overlapping copper in the design/layout file. This extra deposition of copper could be copper pads, surfaces, or traces.

The minimum overlap should be 0.5mm, and the connected copper definition should be 0.3mm on the linked layer sitting on the substrate. So the minimum width of this copper surface should be 0.8mm.


An engineer designing a printed circuit board


On non-connected layers, the copper layer on the board should be at least 0.8mm away from the edge/outer contour. Therefore, the minimum gap from the inner trace to the edge copper layer defined as the connected copper should be 0.5mm.


Metalized Edge Plating Process


This process requires only four steps in the following order.

  1. Drilling
  2. Milling metal slot
  3. Cleaning to get rid of dirt
  4. Electroless copper plating

The outer contours must undergo milling before thru-hole plating because edge metallization occurs in this fabrication step. And the next step after copper deposition is applying the surface finish.


A PCB in the production process


But these two issues can arise when fabricating the metal edges.

  • Copper peeling: Electroless plating over a large substrate area can lead to the copper layer peeling due to minimal adhesion strength. Therefore, you should roughen the surface using proprietary means, such as chemicals. This roughened surface will create a higher copper bond strength when you do direct metallization.
  • Burrs: Edge plating can create burrs from the concluding machining process, especially on castellation holes. You can apply a proprietary process flow with minimal modifications to polish the burrs to the feature's edges.


Fabrication Notes


  • If the inner edge pad connects to the board's wires, it will create a short circuit.
  • A gold pad's antenna position that is too large will affect signal transmission or soldering.
  • You can cover the metalized edges with a solder mask layer.
  • Design the stamp hole at the edging groove and handle it in the second drilling process.
  • All-round edge metallization is impossible on the outer edges through the individual PCB fabrication process as a panel (large volume production). You cannot metalize the small panel bridge locations. However, it is possible on a single board or prototype.


Benefits of PCB Edge Plating


  • Enhanced current conduction: Improving the current-carrying capability enhances the board's reliability and quality. Also, the right conduction level is ideal for components to operate as required. And it can protect vulnerable edge connections, as well.
  • Signal integrity: Edge plating enhances signal integrity by preventing interference from getting to the internal electrical pulse transmission.
  • Thermal distribution: Since the plated edges are metallic, they create an additional cooling surface area for dissipating heat to the surrounding air. As modern PCBs pack more components onto a tinier surface area, these metal surfaces increase the board's reliability, especially if the parts are heat-sensitive.


A mini wireless Bluetooth module for mobile devices


  • Better EMC/EMI performance: The metalized edges allow stray currents to escape, preventing sporadic electric and magnetic field generation.
  • Improves electromagnetic compatibility: Edge plating enhances electromagnetic compatibility in multilayer boards.
  • Prevents electrostatic damage: Electrostatic charges can hit sensitive components when handling the board, but these metal surfaces help absorb them.


PCB Edge Plating Applications


  • Edge soldering for better fabrication
  • Board-to-board connections
  • Increase current carrying capacity
  • Enhance connectivity into metal casings (housing connection)
  • To enhance EMC performance


Wrap Up


To conclude, PCB edge plating is a simple addition process, but it requires specialized equipment and skilled fabricators to carry out the process with precision. At OurPCB, we have the equipment, trained engineers, and experience to fabricate metalized edge PCBs for your project. Contact us today to get a free quote for your PCB edge plating designs.

Contact Details

Phone Number : +8613826589739

WhatsApp : +8613826589739