Why Conformal Coating is your custom PCB option?
Conformal Coating is also known as three-proof adhesive, insulating adhesive, moisture-proof agent, moisture-proof oil, protective paint, protective paint and other aliases.
Conformal Coating in the “three anti” refers to moisture, mold, salt spray, but the funcation of Conformal Coating is not only this , it also hasAnti-dust, anti-friction, shock, high temperature, chemical environment, prevent PCB circuit board failure, improve the insulation strength, extend the life of the circuit board, etc.,
coated with conformal can form a dense protective film on the surface of the PCB to protect the circuit from erosion.
How to reduce the cost of Custom PCB?
PCB design engineers must not consider all aspects that may affect the total cost of manufacturing PCB, especially Custom PCB printing.custom printed circuit board designers fail to consider the costs associated with manufacturing them.
Factors that affect the cost of manufacturing custom PCBs, tooling costs, board part spacing and PCB size, number of layers and materials. To ensure significantly lower manufacturing costs, plan the size of the board, choose a simple and regular pcb shape, and select the more common materials.
2 Way for getting Quatation of Custom PCB
There are 2 ways to get a custom pcb quote from us.
You can also leave your name, email address, and your specific requirements on our website, and Venture’s sales team will be available 24/7 to address your questions online.
You can send a PCB Gerber directly to a Venture sales representative via email with information about required quantities and lead times.
Venture can provide service with 7/24/356 and send the quotation within 2 hours!
PCB is a board that connects various electronic components in a particular device.
You can customize it depending on your needs.
Your Leading Custom PCB Supplier in China
Get your top of the range custom PCB at Venture. We follow the best practices in ensuring that your boards will fit your applications perfectly and fully functional. For over 20 years, we have manufactured custom PCBs for various industries. Our Custom PCB has advanced features that are capable of giving your applications the quality it deserves.
Standard PCBs are the most commonly used type of PCBs. With Standard PCB, fiberglass-reinforced epoxy-laminated sheets are used as the backbone material. Standard PCB (Printed Circuit Board) manufacturing refers to full manufacturing service of Printed Circuit Boards that use FR4 as the base materials.
PCBs come in many types, depending on the intended use. The most dominant custom circuit boards include single-sided printed circuit boards, double-sided PCBs, multilayer PCBs, rigid PCBs, flex PCBs, and rigid-Flex PCBs
To know how custom PCB is designed, we need to get familiar with the basic designs, schematic capture, Gerber files, and PCB layout tools
The first step in creating a custom PCB is laying out the schematic view. Place your components onto a canvas, and then connect the pins with lines representing electrical connections. You may find yourself faced with multiple choices for the same part number. That’s because many apparatuses come in different packages, such as a DIP (dual in-line package) chip or a surface-mount chip. For hobby PCBs, you almost always want to go with the big, bulky DIPs and SIPs (system-in-packages), because they’re easily found at hobby venues and are easier to join than surface-mounted devices, which are meant for commercial applications. Although the various packaging options may look the same in the graphic view, they will appear very different when you go into the layout view to actually design the board.
Printed circuit boards (PCBs) solve all those shortcomings. But most people don’t even consider translating a one-off project into a PCB design. For one thing, PCB fabrication has traditionally been expensive, viable only in commercial quantities. Also, there are technical constraints involved with PCB designs that are daunting to the casual hobbyist. But it turns out that nowadays you can produce a professional PCB very inexpensively.
The PCB you choose must be ideal for your needs. When it comes to reliable, cost-effective, and durable products, you can count on Venture. Our PCB solutions are customized to fit your unique needs.
For your inquiries, please contact us.
Custom PCB: The Ultimate FAQs Guide
Before you import custom PCBs, read this guide.
It covers every detail about custom PCBs such as material type, fabrication techniques, component mounting, drilling holes and assembly, just to mention a few.
So, if you want to be an expert in custom PCBs, read this guide.
- What is a Custom Printed Circuit Board?
- What are the Advantages of Custom PCB?
- What is the Function of Ball Grid Array (BGA) in Custom PCB?
- Which are the main Steps in Custom PCB Manufacturing Process?
- What is Design for Manufacturability Checks in Fabrication of Custom Printed Circuit Board?
- What is the Role of the Silkscreen legend in Custom PCB?
- Is Schematic Important in Construction of Custom PCB?
- What is the Purpose of Solder Mask in Custom Printed Circuit Board?
- Which are the Disadvantages of Custom PCB?
- Do You Need a PCB Prototype when Developing Custom PCB?
- What is the Average Thickness of Custom PCB?
- Which are the Main Components of Custom PCB?
- How many Layers should you have in Custom PCB?
- How Does Trace Width Affect the Performance of Custom PCB?
- What are the Best Custom PCB Design Software?
- Can you Reverse Engineer Custom PCB?
- How do you Design Custom PCB Layout?
- Why is Trace Clearance Important in Custom PCB Manufacturing?
- What is the Preferred Fiducial in Custom PCB?
- Why is Drill Hole Size Tolerance Important During Fabrication of Custom PCB?
- Which are the Main Materials Used in Custom PCB?
- What are the available Surface Finishes for Custom PCB?
- How do you Assemble Custom PCB?
- Which are the Different types of Vias used in Custom PCB?
- What is the Function of Conformal Coating?
- When should you Choose Custom PCBs?
- How can you Check Quality of Custom PCB?
What is a Custom Printed Circuit Board?
Custom PCB is a type of printed circuit board manufactured using your PCB design layout.
It is customized to the PCB specifications required by the client.
In this type of PCB, you have control over the entire process of PCB fabrication, from Gerber files, PCB layout to PCB components.
The PCB manufacturer only helps in printing of the custom PCB.
Custom printed circuit board
What are the Advantages of Custom PCB?
The main benefits of Custom PCB include:
- These types of PCB normally require minimal re-work because of their inherent excellent reliability.
- After designing and constructing the PCB, you can re-use the bill of materials, Gerber files, and schematics to affordably fabricate another PCB.
This is instrumental when there is a need for another prototype, which was not anticipated originally.
- You can recycle the schematics for the future fabrication of similar custom PCB.
It saves design time after designing a circuit board for a prototype.
What is the Function of Ball Grid Array (BGA) in Custom PCB?
A BGA is one of the many types of surface-mount packaging used in Custom PCB.
The package aids in mounting PCB components like microprocessors.
BGA can offer more interconnection pins compared to other types of SMT packages.
If you intend to include a BGA-packaged component, that single component often determines the count of layers the custom PCB should have.
With a couple low-density packages, it is possible to utilize double-layer PCB.
Certain BGA packages need a minimum of the 4-layer circuit board, with the need for more PCB layers as the number of packages increase.
For instance, a PCB BGA package having 7 to 8 balls rows typically requires a 6-layer PCB.
This includes both a ground plane and a power plane.
Some BGA packages having a 0.8 mm pin-pitch and above 1000 pins need a minimum of 8 layers and buried, blind and micro-vias.
Which are the main Steps in Custom PCB Manufacturing Process?
Let’s look at the step-by-step process of fabricating Custom PCB:
Step 1: Design and Output
The custom PCB should be perfectly compatible with the PCB layout, usually developed utilizing PCB design software.
There are several software for designing custom PCB.
It is important to inform the PCB manufacturer about the software version applied to design the board.
This is vital in preventing problems due to discrepancies.
After approval of the PCB design, it is exported to the format supported by the manufacturer.
Extended Gerber is a commonly used program.
Step 2: Transferring File to Film
Printing of custom PCB starts after you output the schematic files and performing a DFM check.
A plotter, a special type of printer creates photo films of the board.
The equipment applies an outstandingly accurate printing technology to create an exceptionally detailed PCB design film.
The final product is a plastic film having a photo negative of the board in black ink.
For the internal layers, the black ink denotes the conductive copper components of the printed circuit board.
The other clear section of the image represents the non-conductive material areas.
The exterior layers use the reverse pattern: clear parts denote conductive copper, though black represents section that will be etched away.
PCB design process
Step 3: Printing the Interior Layers
The step-in construction of custom PCB prepares to produce the actual circuit board.
It entails whittling the copper in the substrate material away to expose the design of PCB from the films.
Cleanliness is very crucial in this step, since any stray dirt particle on the laminate may make the circuit short or stay open.
Therefore, the PCB is wiped and passed across a decontaminated environment.
A photoresist layer made of the photo-sensitive film is applied to the clean panel.
The layer constitutes photo-reactive chemicals that harden when subjected to a blast of ultraviolet light.
The UV light goes via the clear film parts, stiffening the photoresist onto the copper below.
The prepared board is then cleaned using an alkaline solution to eliminate any unhardened photo resist.
Finally, pressure wash is used to remove any particle remaining on the surface, and then the PCB panel is dried.
It is important to note that this procedure is only applicable on over two layers of custom PCBs.
Step 4: Removal of Unwanted Copper
This is done by immersion the board in a bath of copper solvent solution that eliminates all exposed copper.
However, required copper stays completely guarded below the hardened photoresist layer.
Some heavier PCBs need high copper solvent quantities and differing duration of exposure.
Eventually, another solvent is used to wash the hardened photo resist, exposing the required copper.
Step 5: Alignment of Layer and Optical Inspection
The registration holes help in aligning the internal layers to the external ones.
An optical punch facilitates accurate correspondence, ensuring precise punching of the registration holes.
Afterwards, another equipment carries out automatic optical inspection to ensure complete absence of flaws.
It scans the layers of custom PCB utilizing a laser sensor, then electronically contrast the digital picture against the original Gerber file.
Step 6: Layer-up and Bonding
At this stage, all the custom PCB layers are bound together on a steel table having pins where the layers tightly fit.
After placing the layers in the right order on alignment basin, the whole process is performed automatically through the bonding press computer.
Step 7: Drilling
This process entails making the through holes of custom PCB, whose precision is key to the PCB components to be mounted.
After locating the right drill target points using an x-ray locator, registration holes are drilled to fix the PCB for actual drilling.
To make sure there is a clean drill, a buffer material is placed underneath the drill target.
The material helps in preventing any unwanted tearing when the drill bit exits.
After drilling, a profiling tool helps in removing the copper lining the edges of the PCB holes.
Step 8: Plating and Deposition of Copper
In this process, the different PCB layers are linked together through chemical deposition.
The custom PCB panel goes through a chain of chemical baths after a rigorous cleaning.
In the baths, a process of chemical deposition plates a thin layer of copper into the drilled holes.
Step 9: External Layer Imaging
Similar to step 3, this step involves application of photoresist to the circuit board.
Although, this time the outer panel layers are imaged with custom PCB design.
To prevent contamination of the surface, the photoresist layer is applied in a sterile room, then the panel moves into yellow room.
With stencil and circuit board in contact, a generator radiates them using strong UV light that assists in hardening the photoresist.
The board then goes into a machine that eliminates the unhardened photoresist.
The outer plates eventually undergo inspection to confirm that all unwanted photoresist was removed.
Step 10: Plating
Here, the exposed parts of the custom PCB are electroplated with a thin copper layer.
Often, the PCB panel subsequently undergoes tin plating, which protects parts of PCB intended to stay covered with copper in the following stage.
Step 11: Final Etching
Etching eliminates unnecessary exposed copper from the custom PCB.
Again, chemical solvents are utilized to remove the excessive copper, with the tin plating screening the needed copper foil.
Final etching helps in creating the conductive traces and connections.
Step 12: Application of Solder Mask
The PCB panel is cleaned before applying epoxy solder mask ink on both sides.
The board is then irradiated with UV light to harden the solder mask.
Eventually, it goes through an oven that helps in solder mask curing.
Step 13: Surface Finish
To put additional solderability to the custom PCB, it can be chemically plated with silver or gold.
Some also get hot-air-leveling in this phase of circuit board manufacturing.
The hot air leveling leads to even pads.
PCB surface finish
Step 14: Silkscreen
The almost finished board gets ink-jet writing on the surface, which shows all essential information relating to the custom PCB.
The board then goes to the final coating and curing step.
Step 15: Electrical Test
As a final safety measure, the PCB undergoes electrical tests.
This is an automatic process that evaluates the functionality and conformity to the original PCB design.
What is Design for Manufacturability Checks in Fabrication of Custom Printed Circuit Board?
DFM checks evaluate whether there exist any potential issues of design flaws before starting the process of manufacturing custom PCB.
The analysis helps in detecting errors and possibly correct and cut cost by pinpointing areas where you could make the design more efficient.
Using DFM software, it is possible to detect flaws that would often stay undetected.
This may lead to the design rework or a complete scrap of the PCB.
Some of the common issues detected by DFM analysis include insufficient annular ring, slivers, acid traps, and starved thermals among other problems.
What is the Role of the Silkscreen legend in Custom PCB?
A silkscreen legend found on the bottom or top of the custom PCB surface gives readable information concerning component placement and part numbers.
This is helpful in production and repair.
Advanced technology enables the printing of component designators directly on the surface of PCB.
This does away with silkscreens, which saves money and time.
It is at times carried out using a special type of inkjet printer.
Is Schematic Important in Construction of Custom PCB?
A PCB schematic is a sketch or drawing that shows how the custom PCB functions at a conceptual level.
Developing a schematic helps in quick documentation of the components of PCB in a manner that is easy to read and understand.
A correctly captured schematic is instrumental in the process of designing PCB by hierarchically arranging the electrical components of the evolving custom PCB.
It is the plan or blueprint since PCB schematic outlines how the board will eventually attain connectivity.
This makes it a crucial part of the custom PCB design process.
What is the Purpose of Solder Mask in Custom Printed Circuit Board?
Solder mask refers a fine lacquer-like polymer layer on the copper traces of custom PCB.
It is instrumental in protection against oxidation and preventing the formation of solder bridges between very close solder pads.
The typical green color of printed circuit boards originates from the solder mask.
It maintains every PCB component in place and avoids shorts through the insulation of copper traces from supplementary conductive materials on the PCB.
Moreover, it as well comprises of holes that serve two roles:
- To permit PCB parts to be soldered onto the board, and
- To shield remaining parts of the custom PCB from solder.
Which are the Disadvantages of Custom PCB?
The main disadvantages of custom PCB include:
- Requires plenty of initial tooling and design time
- Hard to revise several times
- Can be ruined by high current amperage
- Can be difficult and expensive to replace or repair due to rapid changes in PCB technology.
Do You Need a PCB Prototype when Developing Custom PCB?
Before starting a full manufacturing run, it is important to ensure that the custom PCB is working correctly.
It can be exceptionally costly if the board functions inadequately or fails after full production.
Therefore, prototyping the custom PCB can help you prevent such scenarios.
Prototype PCB is used early during the design process to evaluate the functionality of the circuit board.
Designers usually use multiple prototypes runs to examine one function or test redesign prior to starting the actual PCB production.
This allows earlier detection of elements that need correction, as timely detection of issues helps in cost reduction.
For effective custom PCB prototyping, work with a PCB manufacturer capable of quickly developing high-quality prototypes.
The created prototype should conform to how the end product will work as close as practical.
What is the Average Thickness of Custom PCB?
The thickness of a custom PCB depends on your specification, however, most circuit boards have a general thickness of 1.58 mm (1/16 inch).
Some highly dense SMT PCBs feature an average thickness of 0.79 mm (1/32 inch). This allows drilling of smaller vias, hence denser packing.
Depending on the application, your custom PCB can also have a general thickness of 2.3 mm (3/32 inch).
This results in a more rigid board though it needs larger via holes.
Which are the Main Components of Custom PCB?
Most printed circuit boards consist of the following key components:
Substrate: Forms the custom PCB foundation, and is usually comprised of fiberglass or other non-conductive PCB materials. You can have single layer or multilayer PCB substrate.
Copper: Assumes the place of the cable by helping in the transmission of electric current.
Solder mask: This layer on the board surface assists in protecting the underneath conductive traces from unfavorable conditions.
Silkscreen: A sheet of ink traces instrumental in marking warnings, PCB components and additional properties unique to the connectivity of the product.
Diode: This component permits flow of electric current in one direction whilst obstructing the other.
Resistors: Color-coded controls which allow the flow of current
Capacitors: These custom PCB components are engineered to store electrical charge necessary for the functioning of the device.
Switches: Permit or prevent the flow of current, based on whether they are closed or open switches.
Inductors: Refers to a passive element that resists sudden current change.
Battery: Links voltage to the Board circuitry.
How many Layers should you have in Custom PCB?
Single layer vs multilayer PCB
Majority of PCBs feature between 2 to 20 conductive layers adhered together with insulating plastic.
Boards having more than 2 two layers aid in the construction of dense or complex custom PCBs.
However, they are not commonly used since the inspection and repair of interior layers is more difficult.
Moreover, the cost of manufacturing a multilayer PCB is very high.
In more complex multiple-layer circuit board, 2 or more of the PCB layers are committed to providing power and ground.
The power plane and ground plane help ineffective distribution of power.
They as well hinder radio waves out of antennas unintendedly produced by tracks.
Typically, 4-layer PCBs having power and ground plane are applied in high-quality, cost-effective medical, avionic and audio electronics.
Nevertheless, majority of consumer devices feature single or double-layer PCBs.
How Does Trace Width Affect the Performance of Custom PCB?
Different trace widths have different characteristics that could affect your custom PCB performance.
For instance, a thick trace has a lower resistance than a thin type.
Therefore, it can conduct more current or would have more heat up for a similar current amount.
Most PCB manufacturers can produce a minimum of 0.006-inch trace width.
This minimum trace width is sufficient for most analog and digital applications of PCB.
What are the Best Custom PCB Design Software?
Here are some of the best custom PCB design software that you can choose from:
- PCB Artist
- Altium Designer 17
- SOLIDWORKS PCB
- Eagle PCBs
- KiCad EDA
- DesignSpark PCB
Can you Reverse Engineer Custom PCB?
At time the schematic of printed circuit board can be lacking.
In such situations, it is possible to manufacture replacement components by utilizing the data developed from reverse engineering PCB.
Nonetheless, PCB reverse engineering can be a tiring and difficult procedure.
Here are some of the reasons of reverse engineering of custom PCB:
- To replace obsolete components of the PCB
- To relocate some the circuit board components
- To enhance the performance of the printed circuit board
- To evaluate and improve security requirements
How do you Design Custom PCB Layout?
Designing the layout of custom PCB requires skills on software and computer-aided system employed in PCB fabrication.
Here are the key steps involved in designing PCB layout:
Step 1: Schematic Conversion to a PCB
Convert the schematic to PCB by clicking the “convert to PCB” option on the type of editor you are using.
Step 2: Component Dragging and Dropping
Here, you locate the document to the precise location you need it.
When you want a neatly looking custom PCB, place the components with similar role close to one another.
Step 3: Sketching of Custom Outline
Move to the layer menu and choose the board outline layer.
Then click and delete the outline.
Next, develop your desired shape by applying the PCB tools.
Step 4: Copper Area
This process entails linking various parts to a single signal.
Use the tools menu to develop copper are.
Step 5: Routing
There exist two means of completing the routing.
Apply the auto-router functionality at the page top to do the routing when creating low current custom PCB.
However, perform the routing manually where you require different track sizes.
Step 6: Holes
Utilize the hole tool found on the tools menu to develop holes on the custom PCB layout.
Step 7: Adding Texts and Pictures
To put texts or pictures onto the custom PCB, move to the tools menu and scroll to locate the picture or text tool.
Set your desired book or make modifications as preferred.
Step 8: Photo View
The final step after completing the above procedures is viewing the outcome.
You can alter the color or other features in case you are not contented with it.
Click the “fabrication output” of content with the end result.
Why is Trace Clearance Important in Custom PCB Manufacturing?
Trace clearance of custom PCB refers to the shortest distance between two PCB conductive traces.
PCB trace width
The width and spacing of traces on a custom PCB is very essential.
If the traces are too close with each other, the solder can short circuit the neighboring traces.
This will make construction or repair of the board very difficult.
On the other hand, when the conductive traces are excessively far apart, the circuit board might be too bulky and expensive to manufacture.
When manufacturing high-frequency custom PCB, it is advisable to have traces of exact lengths and width.
Ensuring this helps in controlling the characteristic impedance of the conductive traces.
What is the Preferred Fiducial in Custom PCB?
Most PCBs feature tooling holes and alignment marks referred to as fiducials that help in aligning the layers.
A solid circle having a 1 mm diameter is the recommended fiducial.
This allows mounting of the custom PCB in a machine that automatically positions and solder components.
Some designs as well feature quality control patterns for measuring etching and soldering processes.
Why is Drill Hole Size Tolerance Important During Fabrication of Custom PCB?
We all know that custom PCB manufacturing is not perfect.
Therefore, a tolerance with plus/minus specific value specified on the part datasheet.
The drill hole tolerance is essential in compensating for variations in temperature, material, wear, machining, plating and aging among other factors.
For instance, the datasheet for a particular PCB fabricator of ¼ W resistor indicates 0.022 ±0.003 lead diameter.
To calculate the minimum, deduct the tolerance from the specification value, and sum up the tolerance and specification value to calculate the maximum.
Hence, the actual component can range from 0.019 to 0.025.
Drill size tolerance determines how much wider the PCB hole must be in comparison to the part.
As a general rule of thumb, the custom PCB hole needs to be 0.007 inches wider than the lead diameter of the component.
For instance, the hole diameter needs to be a minimum of 0.029 inches for a resistor having a lead diameter of 0.022 inch.
However, most PCB manufacturers designate a drill hole size tolerance of ±0.004.
The 0.007 rule is suitable for prototyping and hobbyists in most instances.
Normally, the designated tolerance will differ depending on the type of plating and hole size.
Actually, professional custom PCB designers equally factor in the solder type and soldering process.
Which are the Main Materials Used in Custom PCB?
The base of the custom PCB consists of the laminate and the substrate.
Also referred to as the core, the substrate refers to the non-conductive dielectric material, often selected depending on the dielectric constant.
When utilized together with substrates, the laminate offers the surface material or copper foil.
Nevertheless, the laminate might as well be employed as the core material in the construction of some types of custom PCB.
Substrates are generally dielectric composite structures made up of epoxy resin and woven or non-woven glass or paper reinforcement.
It can be supplemented using ceramics to raise the dielectric constant.
PCB manufacturers ensure that circuit board substrate fulfil certain features specifications, such as glass transition temperature (Tg).
There exist various types of standard substrates materials used in the manufacture of most custom PCBs including:
- FR-1 to FR-5 (with FR-4 being the common type of PCB substrate)
- CEM-1 to CEM-5
- Insulated Metal Substrate (IMS) or Aluminum
- G-10 and G-11
- Polytetrafluoroethylene (PTFE)
- RF-35 PCB
- Flexible substrates like Kapton and Pyralux.
Manufacture of PCB laminates involves a high-pressure process, and comprise of thermoset resin and paper or fabric layers.
Similar to substrate, custom PCB laminates can be fabricated to satisfy custom characteristics or requirements.
The key features of PCB laminates include glass transition temperature (Tg), coefficient of thermal expansion, and shear and tensile strength.
The common dielectric materials used in circuit board laminates include:
- Polytetrafluoroethylene (Teflon)
Here are also some of the common prepregs materials for custom PCBs:
- FR-2 to FR-6 materials
- G-10 materials
- CEM-1 to CEM-5 materials
Together, the laminate and substrate determine the primary thermal, mechanical and electrical properties of the custom PCB.
What are the available Surface Finishes for Custom PCB?
The type of surface finish for your custom PCB is a very crucial consideration, which affects PCB assembly and reliability of the board.
The main role of the PCB surface finish is to protect copper traces and strengthen solder connections.
Here are the common types of surface finishes for PCB:
- Electrolytic Wire Bondable Gold
- Immersion Silver
- Electroless Nickel Immersion Gold (ENIG)
- Hot Air Solder Level (HASL)
- Immersion Tin
- Lead-Free HASL
- Electroless Nickel Electroless Palladium Immersion Gold (ENEPIG)
- Organic Solderability Preservative (OSP)
- Electrolytic Hard Gold
How do you Assemble Custom PCB?
There are three primary steps in assembling of custom PCB:
Application of Solder Paste
This makes the initial step in PCB assembly where you put on solder paste on the circuit board.
There are two basic techniques of applying solder paste.
You could utilize a solder paste stencil, which ensure uniform, repeatable application of solder paste.
Moreover, use of stencil facilitates quick and easy application.
Similarly, you can utilize a syringe to apply a small solder paste amount onto every pad found on the custom PCB.
Placement of PCB Components
After applying the solder paste, the next procedure involves populating the PCB with components.
In this step, having a part placement diagram is important as it helps to locate the correct position of each component.
It identifies the passive components values throughout the board.
Furthermore, part placement diagram as well displays the right RGB LEDs orientation.
Reflowing the Custom PCB
This the final step after placing all the custom PCB components. PCB reflowing entails a heating process till the solder mask reaches its melting point.
On cooling, the solder paste forms permanent joints between the pads and every component on the printed circuit board.
The common techniques of reflowing PCBs use the following machines:
- Reflow ovens
- Reflow skillets
- Reflow hotplates
- Modified toaster ovens
- Hot air reflow equipment
After reflowing, confirm to ensure that none of the PCB components created solder bridges or shifted away from the pads.
Formation of solder bridges could lead to short circuits on the custom PCB.
Which are the Different types of Vias used in Custom PCB?
An abbreviation for vertical interconnect access.
A via refers to a plated thru-hole used for vertical trace routing in PCB from one layer to the other.
Drilling of PCB vias can be performed by laser drilling or mechanically through drill bits.
They are then plated to create electrical connections between the PCB layers.
The most popular types of custom PCB vias include:
Type of vias
- Blind via: Refers to via type that only stretches from one layer of PCB to the next.
- Buried via: This type of via is commonly used in sequential lamination PCB application. Buried vias links two or more interior layers of custom PCB without going out through an exterior layer.
- Through via: This via links two outer layers by boring all the way from the top layer to the bottom layer.
- Blind via in-pad: This refers to a type of via that only stretches from one layer of PCB to the other.
What is the Function of Conformal Coating?
Conformal coating refers to a non-conductive polymeric dielectric film that is applied and conforms to the components of the PCB.
It serves as both an insulating material and protecting shield for the custom PCB.
The primary role of conformal coating is to protect PCB components from corrosion and environmental elements.
It shields PCB parts from destruction as a result of fungus, salt spray, moisture, corrosion, contamination and dust due to harsh environments.
There are five primary types of PCB conformal coating based on their chemical composition, which include:
- Urethane resin (UR)
- Acrylic resin (AR)
- Epoxy resin (ER)
- Parylene (XY).
- Silicone resin (SR)
The main factors to consider when choosing conformal coating for custom PCB should by PCB application and desired functionality from the application.
When should you Choose Custom PCBs?
You should opt for custom PCB when you want to ensure that:
- Electronic product functions as you desire since you will layout the board to operate with the PCB components you require
- Custom PCB installs perfectly in the electronic device you are developing
- You have control over every phase of the custom PCB production process.
How can you Check Quality of Custom PCB?
Visual inspection is the most common technique for quality analysis of PCB, which is always done throughout the process of PCB manufacturing.
This method of checking quality of PCB is vital since it support certain automatic production and assembly operations.
Nonetheless, detailed testing and complex machinery are needed to offer high-level quality analysis of custom PCB.
Below are some of the test methods for checking quality of PCB:
Peel Test: Applied to establish the strength amount needed for the PCB laminate to peel.
Solder Pot Test: Establishes the plated through hole solderability.
Solder Float Test: Determines the level of thermal stress that the PCB vias can endure.
X-ray Inspection: Applied to observe the internal construction of the custom PCB, including vias and layers. You can as well use this quality analysis method to observe interior of components to confirm authenticity and type of device.
Automated Optical Inspection (AOI): Conducted to evaluate the quality of solder and verify trace and pad connections.
Time Domain Reflectometry (TDR): Usually performed to determine characteristic impedances. The test can establish whether differential traces are harmonized to ensure good signal integrity.
Resistivity of Solvent Extract (ROSE) Test: It is a highly reliable analysis that ensures there are no excessive conductive material or surface debris left on the custom PCB.
Depending on your unique requirements and specifications, Venture Electronics offers the perfect solution for all your custom PCB needs.
Whether you need flexible PCB, rigid flex PCB or flexible PCB, Venture Electronics is here to help – contact us now.