In China, PCBMay is the best surface finish PCB manufacturer since 2008. We can custom surface finish PCB based on your designs.
- Over 50 design engineers
- 12 years’ production experiences
- Export products to 60+ countries
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Surface finish PCB is Your Best Choice for Your Project
PCBMay is an expert printed circuit board or PCB manufacturer in China. From the beginning, we specialize in the entire PCB assembly, including our surface finish PCB for your project. PCBMay surface finish PCB is also custom-made depending on your specifications. We need your designs, ideas, or drawings, and our professional design engineers will handle the rest. We own high-tech machines to fabricate your surface finish PCB – 100% durable and extreme quality. Please send us your inquiries today!
Types of Surface Finish PCB Meet Your Requirements
Why Choose PCBMay for Your Surface Finish PCB
For more than ten years in China, PCBMay is experienced enough and owned numerous equipment types to manufacture high-quality printed circuit boards for business or projects. We make sure our surface finish PCB is low cost, re-workable, widely applicable, longer shelf life, and more advantages.
PCBMay is a specialist surface finish PCBs manufacturer for you. If you have more inquiries regarding our surface finish PCBs, directly contact our team. We’re 24/7 hours available.
Related Surface Finish PCB Boards
Surface finish PCB Production Details As Following Up
|Base Material||KB、Shengyi、ShengyiSF305、FR408、FR408HR、IS410、FR406、GETEK、370HR、IT180A、Rogers4350B、Rogers4000、PTFE Laminates(Rogers series、Taconic series、Arlon series、Nelco series)、Rogers/Taconic/Arlon/Nelco laminate with FR-4 material(including partial Ro4350B hybrid laminating with FR-4)|
|Board Type||Backplane、HDI、High multi-layer 、blind&buried PCB、Embedded Capacitance、Embedded resistance board 、Heavy copper power PCB、Backdrill.|
|Copper Thickness||Min. 1/2 OZ, Max. 10 OZ|
|Maximum Board Size||1100*500mm(43”*19”)|
|Min laser drilling size||4mil|
|Solder Mask||Green, Black, Blue, Red, White, Yellow,Purple matte/glossy|
|Surface Treatment||Flash gold(electroplated gold)、ENIG、Hard gold、Flash gold、HASL Lead free、OSP、ENEPIG、Soft gold、Immersion silver、Immersion Tin、ENIG+OSP,ENIG+Gold finger,Flash gold(electroplated gold)+Gold finger,Immersion silver+Gold finger,Immersion Tin+Gold finger.|
|Min. Annular Ring||3mil|
|Aspect ratio||10:1(HASL Lead free、HASL Lead、ENIG、Immersion Tin、Immersion silver、ENEPIG);8:1(OSP)|
|Impedance control||±5ohm(＜50ohm), ±10%(≥50ohm)|
|Other Techniques||Blind/Buried Via|
|Via in Pad|
Here there’re many laminate material datasheets, they’re useful and helpful for you, please see them:
|SUPPLIER||PCB LAMINATE||TYPE||MATERIAL DATASHEET||TG||TD||DK(1MHZ)||DK(1GHZ)||DK(10GHZ)|
|Hitachi||MCL-BE- 67G||Modified Epoxy||DOWNLOAD||140||340||4.9||4.4||–|
|N4000-13EP SI||Modified Epoxy||DOWNLOAD||210-240||350||–||3.4||3.2|
|Stablcor||ST325||–||DOWNLOAD||Thermal conductivity:75w/m.k(with 1oz copper)|
|ST10||–||DOWNLOAD||Thermal conductivity:325w/m.k(with 1oz copper)|
|Bergquist||ht-04503||–||DOWNLOAD||Thermal conductivity:2.2w/m.k(with 1oz copper)|
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If your order is of large volume with PCBMay, you can also choose
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Your Leading Surface Finish PCB Supplier in China
Do you need a surface finish PCB for your business or projects? PCBMay is the best manufacturer you can choose. We’re a China-based leading PCB manufacturer since established in 2008.
PCBMay employs expert and skilled design engineers to custom your surface finish PCB. We have a factory equipped with advanced machinery and high-tech equipment for PCBs production.
Since surface finish PCB is important for PCBs, and we can custom them for you. It functions to prevent copper, the ground plains, exposed traces, holes, and pads from oxidation. This one function is an essential requirement to ultimate application performance.
All surface finishes PCBs we offer meets the IPC Class 2 and Class 3. It carries the quality you need for a specific application.
PCBMay’s surface finishes PCB features fast speeds is high-density, and is light in weight. Unique, lead-free, and modern surface finishes meet the ROHS and WEEE directives. All surface finish PCBs are affordable to fit your budget.
To determine the suitable surface finish PCBs for your application, we can assist and gives recommendations. We will make it easier for you, so trust our full capabilities. For assistance, you can send our expert engineers a call or email.
The types available for surface finish PCBs include ENEPIG, ENIG, immersion silver, electrolytic nickel/gold – Ni/Au, immersion tin or white tin, lead-free HASL, OSP, etc. All have a longer shelf life and high resistance to drop and shock.
For all application environments that require stability, high-heat, vibration, or thermal, surface finish PCB is ideal for you. And PCBMay is the best, reliable manufacturer in China you can depend on.
We export our surface finish PCBs to more than 60 countries all over the world. Before mass production, we use raw quality materials to fabricate longevity, durable, and high-performance PCBs.
For further inquiries about surface finish PCBs, kindly contact us.
Surface Finish PCB| The Ultimate FAQ Guide
Are you worried about the decay of PCB surfaces?
Then surface finish PCB will bring out calmness in your mind. Usually, surface materials of PCB lessen their efficiency due to various corrosions. Different kinds of surface finish PCBs act to prevent any kind of decay. That’s why this is a highly effective solution for PCB-driven devices.
Do you know about the pros and cons of surface finish PCB? Don’t be nervous. PCBMay is a worthwhile manufacturer of surface finish PCB for a long period. We are here with this FAQ guide to inform you about this PCB technique.
What Is a Surface Finish PCB?
Surface finish PCB refers to the covering of the uninhabited surface of PCB. Electrically conductive chips on PCB are plated in different ways. Surface finish PCB is useful for optimizing the copper traces.
Surface Finish PCB
Usually, nickel(Ni), gold(Au), lead(Pb), silver(Ag), tin(Sn), etc materials are widely used in surface finish PCB. These metals are extremely functional to minimize the corrosive properties of copper in surface finish PCB.
Besides, they are applicable for solving soldering issues of PCB. To achieve optimum performance of electrical circuits, using surface finish PCB is the most convenient way.
What Are The Types Of Surface Finish PCB?
Surface finish PCB shows versatility according to its procedure. Basically, there are two types of surface finish PCB.
- Metallic surface finish PCB
- Organic surface finish PCB
Different Types Of Surface Finish PCB
You will find various types of metallic surface finish PCB concealing which metal is used for coating. Such as:
- HASL(Hot Air Solder Leveling)
- ENIG(Electroless Nickel Immersion Gold)
- ENEPIG(Electroless Nickel Electroless Palladium Immersion Gold)
- Immersion Tin
- Electrolytic wire Bondable gold
But, organic surface finish PCB doesn’t have much variety. OSP(Organic Solderability Preservative) is the most common organic surface finish PCB. All of these types have different positive sides and drawbacks.
How Does Surface Finish PCB Function?
Surface finish PCB is crucial for numerous applications. This is applied to impede corrosion and oxidation of the copper surfaces. All of its categories use coating mechanisms to make a barrier layer outside of the surface.
Surface Finish PCB With High Functionality
You can cover the copper by using different metals like gold, silver, etc. Again, organic ways can be applied in this case. This layering provides the required protection to the copper surface from being connected to the outer environment.
Besides, surface finish PCB has a reputation for promoting solderability. That’s why it has become a trustworthy PCB solution nowadays.
What Are The Advantages Of Surface Finish PCB?
Surface finish PCB is now the most effective protective measure for PCB surfaces. Various types of surface finish processes provide immense benefits to electric devices.
- Increasing the resistance against surface decaying
- Promoting the solderability of PCB
- Enhancing the functionality of devices
- PCB turns into more thermal resistive
- Maintaining the constant flow of electricity
- The service life of PCB increases
- It usually causes no harm to the environment
- It prevents oxidation in PCB surfaces
- Surface finish PCB is designed to promote compatibility with high-volume projects.
Surface Finish PCB
How Can You Choose The Best Surface Finish PCB?
There are various methods available for surface finish PCB. But, you can choose the best surface finish PCB considering some key factors. Such as:
This is a crucial factor for surface finish PCB. Solderability affects the performance of PCB to a large extent. You should select the surface finish PCB which offers high solderability.
The Best Surface Finish PCB
Besides, the number of PCB soldering influences the surface finish PCB. All of them are not compatible with multiple soldering.
The metal used in the wire bonding affects the choice of surface finish PCB. Like, aluminum and gold wire bondings are applicable for ENIG and ENEPIG surface finish PCB.
Some surface finish PCBs require a big budget. That’s why you should consider the cost-effective surface finish PCB for your convenience.
The number of PCB and PCB sizes also determine which surface finish PCB will be suitable. Even and thin pads are effective for PCB applications. These properties reduce impedance problems and effectiveness.
Surface finish PCB should be highly durable. To provide the best performance in different thermal states, sound durability keeps the surface finish PCB one step ahead.
Your surface finish PCB must be RoHS certified. You also need to ensure that it creates no serious problems for nature.
These considerations will lead you to the best surface finish PCB for your PCB projects. Watch this video for your convenience: https://youtu.be/wqTef_xfbeI
What Is A Black Pad On Surface Finish PCB?
Black pad is a special displeasing condition of surface finish PCB. This is usually seen when gold is used for ENIG surface finish PCB. It is a serious drawback for PCB surfaces.
Black Pad In Surface Finish PCB
Black pad impedes the smooth flow of electrons through PCB. Again, it reduces the solderability via the uneven pads. Usually, a discharge of sulfur from the solder mask creates this problem.
Is Metallic Surface Finish Better Than The Organic Surface Finish PCB?
Metallic surface finish PCB consists of some high conductive metals like copper, nickel, palladium, silver, gold, etc. On the other hand, organic surface finish PCB deals with organic compounds rather than metals.
Metallic surface finish PCB shows higher quality performance than organic surface finish. The reason behind it includes-
Metallic surface finish PCB is easier to test than organic surface finish. Since it deals with metals, you have to face less difficulty in the inspection.
Metallic Surface Finish PCB
Unlike organic surface finish PCB, ENIG or HASL provide thermal resistivity for a long cycle. The shelf life of metallic surface finish PCB is long. Organic surface finish PCB like OSP lasts for a maximum of 2 cycles.
OSP never supplies enough protection against corrosion as metallic surface finish PCB. Gold, palladium, silver, etc metals are supremely effective to resist the decay of PCB surfaces.
Besides, metals impede oxidation to a large extent. Thus, organic surface finish PCB lacks reliability.
The mechanism of metallic surface finish PCB is a little bit more complex than OSP. But, it sustains for a long period. OSP creates some serious problems while coating. Like, the solvents used here eliminates OSP.
Metallic surface finish PCB promotes solderability considerably. That’s why it is the most widely-used surface finish method.
Is ENIG Preferable To HASL Surface Finish PCB?
ENIG and HASL both surface finish PCBs have versatile uses. But, ENIG surface finish PCB is preferable to HASL from many angles.
- HASL contains harmful lead. Besides, fusion oil and flux of HASL emit injurious rays. On the contrary, ENIG is free from lead and emission. That’s why the ENIG surface finish PCB is more nature-friendly than the HASL.
- ENIG surface finish PCB is a gold coating technology. It results in a flat surface. That means ENIG surface finish PCB is compatible with large BGA productions. HASL can’t render flatter surfaces as ENIG.
ENIG Surface Finish PCB
- There is no bridge effect seen in ENIG. But, HASL surface finish PCB forms a bridge while attaching components with the PCB surface.
- HASL surface finish PCB has a lower price than ENIG. But, ENIG surface finish PCB provides a long service life. So, its effect of high cost lessens. Besides, both of these surface finish PCBs have a similar price in the case of more layers.
- When protection from corrosion comes in place, ENIG surface finish PCB delivers better performance than HASL.
- The thermal resistivity of ENIG surface finishes PCB is more effective compared to HASL.
- ENIG surface finish PCB is extremely efficient for high-density applications. But, HASL isn’t so reliable in that case.
So, ENIG surface finish PCB is applied in more applications because of their superior performance than HASL.
What Is A Lead-free HASL Surface Finish PCB?
Lead-free HASL (Hot Air solder Level) surface finish PCB uses copper, germanium, or nickel instead of lead. Since lead is injurious to nature, HASL is discouraged by RoHS. Lead-free HASL is ideal for nature.
Lead-Free HASL Surface Finish PCB
This surface finish PCB is low-cost and easy to manufacture. HASL without Lead can be applied in a high volume of PCB production. It provides impressive solderability. Again, Lead-free HASL is compatible with temperature change.
But, it has some negative sides due to the absence of lead. Lead-free HASL requires a high temperature for solder processing. Besides, it creates the bridging effect that hampers the smooth flow of electricity.
What Immersion Coatings Are Used In Surface Finish PCB?
Surface finish PCB with immersion coating is a popular method to eliminate deterioration of PCB surfaces. It has two categories. Let’s have a look at these immersion coatings of surface finish PCB.
Silver covering is applied through electroplating over copper trace in immersion silver coating surface finish PCB. A layer of less-reactive gold is added with silver. This is useful to prevent oxidation.
Immersion Silver Surface Finish PCB
Immersion silver coating offers impermeable PCB packaging. This renders the opportunity to a long time carry-out of the soldering process. Besides, it is beneficial to small chips and BGA( Ball Grid arrays).
That’s why The copper-silver combination is highly compatible with surface finish PCB.
Here, copper traces are electroplated by tin(Sn). Immersion tin coating of surface finish PCB does not last so long compared to the immersion silver. But, this is comparatively cost-effective.
Again, copper-tin amalgamation provides sufficient thermal resistivity for surface finish PCB. Its soldering process is also commendable.
Immersion tin has some limitations. Like, it is not compatible with the removable solder mask projects. You need to use protective gloves while applying immersion tin coating in surface finish PCB. Moreover, this is not widely used in small numbers of PCBs.
Which Surface Finish Is Suitable For Multilayer PCB?
ENEPIG surface finish PCB is the most suitable for multilayer PCB design. Here, a fusion of nickel and palladium coating is found. This allows ENEPIG surface finish PCB to apply multiple layers of materials.
ENEPIG Surface Finish PCB
A gold layer is also applied over the palladium coat to resist oxidation. That means ENEPIG surface finish PCB operates in 3 layers. This property turns it into a low-cost surface finish PCB.
In multilayer PCB applications, you need to comprise rapid speed, planarity, long lifespan, and high solderability, etc. ENEPIG surface finishes PCB provides all of these features efficiently.
Thus, you can use it for multilayer PCB.
What Are The Comparisons Between ENIG And ENEPIG Surface Finish PCB?
There is a comparison between ENIG and ENEPIG surface finish PCB. ENIG surface finish PCB is used more extensively than ENEPIG. But, ENEPIG is getting popular in many cases nowadays.
ENIG VS ENEPIG Surface Finish PCB
We are explaining the distinguishing factors between these two surface finish PCBs now.
- ENIG surface finish PCB lasts for a longer time than ENEPIG.
- ENIG has a longer shelf life compared to ENEPIG surface finish PCB.
- ENIG renders sufficient evenness and planarity to PCB. So, it is compatible with small components. But, this quality is not so useful in ENEPIG.
- ENIG surface finish PCB offers an easier mechanism.
- ENIG delivers a flatter surface than ENEPIG surface finish PCB.
- ENIG provides more solderability compared to ENEPIG surface finish PCB.
- ENIG surface finish PCB occurs less oxidation.
- Since ENIG is lead-free, it is more effective to nature than ENEPIG.
- The thermal resistivity of ENIG surface finish PCB is higher than ENEPIG.
- ENIG suffers from black pad sometimes. But, ENEPIG surface finishes PCB is free from this problem.
- Unlike ENIG, ENEPIG has an extra layer of palladium. So, ENEPIG provides more effective wire bonding than ENIG.
- The wettability of ENEPIG is slightly higher than ENIG surface finish PCB.
So, the ENIG surface finish PCB is superior to ENEPIG in many aspects.
Is Hard Gold Surface Finish Good For PCB Gold Fingers?
Yes. Hard gold surface finish PCB is effective for PCB gold fingers. Do you know about the gold fingers PCB?
PCB gold fingers are some gold-covered columns. These columns are found by the side of PCB connecting edges. PCB gold fingers are useful to build connections between many PCBs. Hard golds which have 99.6% purity are highly useful for making gold fingers PCB.
PCB Gold Fingers
This surface finish PCB ensures the fitting of gold fingers PCB in specific places of the motherboard. The high planarity and sufficient layer thickness are required to make gold fingers PCB.
Besides, hard gold coating of surface finish PCB promotes electrical conductivity. This property is used in establishing the edge connection of gold fingers PCB.
What Are The Drawbacks Of Electrolytic Wire Bondable Gold Surface Finish PCB?
Electrolytic wire bondable gold surface finish PCB has extensive uses. Here, a layer of hard or soft gold is electroplated on the nickel layer. Gold renders high charge conductivity, etch resistance, solderability, etc.
Soft golds and hard golds are 99.9% and 99.6% pure respectively. Both of these golds have immense uses in surface finish PCB. But, electrolytic gold surface finish PCB also has some drawbacks. Let’s have a look at its limitations.
- Hard gold surface finish PCB is not solderable for more than 17
- The connection between electrolytic gold and terminal points requires technical lead. This addition and elimination of technical leads consume time.
- The sidewalls of surface trace don’t get sufficient finish
- Electrolytic gold surface finish PCB is not effective for high-density PCB applications.
- It is not reworkable
- This is a costly surface finish PCB
- Sometimes black pad is found here
- Solder processing is complex
- Signal loss occurs in the surface finish PCB of RF projects
- Etching in surface finish PCB causes silvering.
- It provides poor integrity of the solder joints
The sum-up of all these limitations turns this surface finish PCB into a less applicable surface finish.
Can You Use Immersion Surface Finish PCB For Small Productions?
Both of the two immersion coatings of surface finish PCB are not suitable for small production. Immersion silver is more compatible with the lower numbers of PCBs than immersion tin.
In the case of surface finish PCB, time delay in soldering hampers the solder joints. Small productions are interrupted during soldering. This is necessary for cost minimization.
Immersion Tin Surface Finish PCB
Immersion silver coating obstructs decaying better than immersion tin. Its copper-silver duo renders sufficient solderability despite the extra time. So, immersion silver is apt for small productions.
But, immersion tin surface finish PCB supports the large volume productions. Here, solder joints are found perfect due to low time dilation in soldering.
What Is The ENP Technology In ENIG Surface Finish PCB?
ENP(Electroless Nickel Plating) is one of the three metallic structures of ENIG surface finish PCB. This is a mixture of nickel and phosphorus.
Here, the nickel layer can resist the diffusion between gold and copper. Again, it produces (Tri nickel tetra stannic) with tin(Sn). This inter-metallic compound promotes the solderability of surface finish PCB.
ENP Process In ENIG Surface Finish PCB
Then, this compound is reduced by. This reduction results in covering the nickel with a palladium surface. Highly active Xyman hydrogen produces nickel and phosphorus from and Pion respectively. That’s why ENP is the amalgamation of phosphorus and nickel.
What Is The Manufacturing Process Of ENEPIG Surface Finish PCB?
ENEPIG surface finish PCB consists of 4 metallic layers. These layers are made of copper, nickel, palladium, and gold. Except for palladium, other metals are also found in ENIG surface finish PCB.
ENEPIG Surface Finish PCB Manufacturing
Here, nickel and gold both are defused. Thus oxidation occurs. The palladium layer is used to prevent decay and oxidation of the nickel layer. This enhances the solderability of ENEPIG surface finish PCB.
Like ENIG surface finish PCB, here palladium is deposited due to the reduction caused by.
How Can You Apply OSP As A Surface Finish PCB?
OSP( Organic Solderability Preservative) surface finish PCB does not use metals. You can apply this water-based technique in an ideal humidity and temperature. The procedure of OSP surface finish PCB is as follows:
- Clean the surface through chemical agents.
- Pull out the nodules and bumps from the copper surface
- Rinse the PCB surface by using an acid
- Apply a thin OSP coating. The total thickness of the coat should be within the nanometer range.
- Again rinse the layer to prevent ionization.
- Last but not the least, dry the coat properly.
OSP Surface Finish PCB
You should avoid sunlight while applying and drying OSP surface finish PCB. This ensures top-quality soldering and corrosion-free surface finish PCB. watch the following video:
What Are The Benefits Of OSP Surface Finish PCB?
OSP coating in surface finish PCB offers some impressive benefits. Such as:
OSP surface finish PCB can be used again after being damaged. This happens due to its easy manufacturing process and high durability.
The entire cost of OSP surface finishes PCB is low. Since it is an organic method, you don’t need to pay more for chemical compounds. Again, its simple fabrication is also responsible for lowering the cost.
Effective OSP Surface Finish PCB
Surface finish PCB with OSP coating offers notable wettability. This also promotes solderability.
Flat Copper Surface
This surface finish PCB renders a flat copper surface where you can accommodate your PCB components. It enhances the quality of solder joints. OSP surface finish PCB also delivers thermal resistivity due to this property.
OSP surface finish PCB is lead-free. That’s why there is no harm in using this organic surface finish PCB.
Attaching Small Component
It is compatible with small components of PCB. BGA and small chips are supported by OSP surface finish PCB.
Except for these, OSP coating provides a long storage period and low use of the ink of solder masks.
How Can You Choose The Best Manufacturer Of Surface Finish PCB?
The best manufacturer of surface finish PCB should have some impressive advantages. Such as:
- A long period of manufacturing experience
- 7/24 hours technical support
- Availability of different surface finish PCB methods
- Skilled technician for smooth and rapid fabrication
- Sufficient storage of materials
- All products must meet the IPC class 2 or class 3 specification
- Certified by RoHS
PCBMay is a trustworthy manufacturer of surface finish PCB with 15 years of experience in production. We provide IPC class 2 standard surface finish PCB. So, contact us for experiencing the best surface finish PCB.
Surface finish PCB is the ultimate solution of preventing corrosion of PCB surfaces. Its tremendous benefits make it compatible with versatile applications. PCBMay provides the most effective surface finish PCB with great manufacturing capability.
We have tried to cover every corner of the surface finish PCB. We hope this FAQ guide will help you choose the best surface finish PCB. If you have any queries, let us know.