2015年3月25日星期三

Surface Finish——Immersion silver

    There’re different surface finishes for PCB boards, including immersion silver, immersion gold, OSP, HASL and so on. Here I would like to introduce the surface finish—immersion silver. Sterling immersion silver is an immersion process for plating a silver deposit on copper, designed to be used as a final finish for printed circuit boards. Immersion silver is quickly becoming the surface finish of choice for PCB fabricators, assemblers and end-users. Immersion silver finish can offer outstanding solder ability, contact functionality, aluminum wire-bonding, solder-joint strength, and is a drop-in replacement for HASL. Some PCB boards may apply both HASL finish and immersion silver finish. The apparent difference between HASL and immersion silver is the color of immersion silver is more matte than HASL. Also, immersion silver can be touched more flushed than HASL.
Features& benefits:
Features:                                  Benefits:
High stability                               Long solution life
Uniform bright deposit                       Improved cosmetics
Wide operating window                      Process control simplicity
Replenished                                Reduced make-up costs   
Using the immersion method of metal deposition, sterling silver is deposited on printed circuit boards as the surface finish. Immersion deposition is also employed in the process of the deposition of gold in the process of ENIG. As the widespread use of immersion silver, a main problem may occur in the PCB fabricating. We called it SMIA (Solder Mask Interface Attack). Silver is deposited to a thickness of 6-18microinches, with a proportional copper dissolution. In some extreme cases, the copper is excessively attacked at the solder mask and copper interface, particularly on conductor traces. That’s what we called just now SMIA. SMIA is a problem which will cause a reduction in conductor width; negatively will affect controlled impedance and extremely will cause open circuits. So when making the immersion silver finish, we should control the volume of chemical material and control the technique.
   Solder Mask Interface Attack (SMIA) can pose a problem to the PCB manufacturer. However, several options for minimizing and eliminating the phenomenon are readily available and easy to implement. To improve the solder mask profile and its adhesion to copper is the most effective avenue in resolving the SMIA. Improving the solder mask side wall profile prevents corrosive chemistry from being entrapped under the solder mask and excessively corroding the underlying copper. Solder mask process parameters are the most successful avenue to investigate and optimize for elimination of SMIA. So having a good command of the solutions for SMIA can commendably avoid the problem.

2015年3月19日星期四

Printed Circuit Board Words

http://www.wonderfulpcb.com/products.html
quick turn PCB,PCB manufacturing,circuit board manufacturing


01、基准尺寸:reference dimension
02、参考尺寸:reaerence dimension
03、直接量定尺寸:direct dimensioning
04、基准图:datum feature
05、基准边:reference edge
06、导线设计距离:design space of conductor
07、导线设计宽度:design width of conductor
08、中心距:center to center spacing
09、线宽/间距:conductor width/space
10、节距:pitch
11、精细节距:fine pitch
12、层:layer
13、层间距:layer-to-layer spacing
14、边距:edge spacing
15、外形线:trim line
16、截面积:crossection area
17、真实值表测量:truth table test
18、准确位置:true position tolerance
19、精确位置:accuracy
20、精确位置误差:cumulative tolerance
21、精确度:accuracy
22、累积误差:cumulative tolerance
23、焊垫:footprint
24、外层:external layer
25、内层:internal layer
26、接地层:ground plane
27、接地层隔离:ground plane clearance
28、电压层:voltage plane
29、电源层隔离:voltage plane clearance
30、电源层:power plane, bus plane
21、导通网络:basic grid
22、导通网格:track grid
23、导通孔网格:via grid
24、连通盘网格:pad (land) grid
25、定位偏差:positional tolerance
26、对准靶标:bornb sight
27、梳状图形:comb pattern
28、对准标记:register mark
29、散热层:heat sink plane
30、端接:termination
Sophie Deng
_______________________________________
Wonderful PCB Limited
NO.32A,Building NO.1, XianDaiC hengHuaTing,ChuangYeRoad|NanShan District,ShenZhen City 518054|  China  T +86-755-86229518-806 | F  +86 755 2607 3529|  e  wonderful08@wonderfulpcb.com |
w  www.wonderfulpcb.com  | Skype:wonderful-07   |                                                   

Dear my friend,
We will attend AsiaWorld-Expo Apr.11-14th and OCT.11-14th 2015. We sincerely invite you

to attend it with us together. Hope we can meet you in Hongkong soon.
Booth Number: 9C27/ 9G24
Time: Apr.11-14th and OCT.11-14th, 2015
Address: AsiaWorld-Expo in Hong Kong

 Wonderful PCB (HK) Limited

2015年3月18日星期三

Oversea PCB assembly service

Regardless of how large, small, old, or new a business is, every company is faced with some problems along the way. When it comes to certain issues like a lack of time and resources, many businesses make the decision to overcome their difficulties by outsourcing some of their work. This is especially true of electronics companies. In order for your business to focus on research, marketing, and sales, you may need to take advantage of the design and assembly solutions offered by a reputable contract manufacturer. Doing so can improve efficiency, speed up production times, and minimize your costs, all while allowing you to provide a stellar product to your customers. For you to be able to enjoy these benefits, though, you need to know what you should expect from your contract manufacturing service. Here's a breakdown of what you should look for:
In order to have all of your needs met, you need to take the time to find an outsource company that's able to provide multiple solutions. Some businesses may only offer design help, while others focus strictly on manufacture. It's simpler and more efficient to work with a business that handles both, and will continue to support you with board repair after the PCBs have been produced. This ensures that you will be taken care of from the very start to the very end of each project.
Does your business have a niche client base or very specific, industry-related requirements for your board design and production? If so, it's in your best interest to find a contract manufacturer that is familiar with your particular market space and can offer expertise and proficiency in those areas.
This one is a biggie. In order for you to provide electronics devices that are efficient, effective, and safe for customer use, your contract manufacturing service absolutely must adhere to industry regulations and standards. Keep in mind that many foreign-based services do not follow the same standards that we do in the United States, and therefore may generate a board that does not comply. Furthermore, the use of counterfeit parts could not only prevent the board from functioning properly, but could also reduce the safety of the finished product. For best results, it's smart to narrow your search for design and assembly solutions to companies that operate in the U.S. and that have a solid reputation for acting with professionalism and integrity.
Without advanced design and assembly equipment that is well-maintained and cared for, how can you possibly expect for your boards to be up to par? Don't hesitate to ask about upkeep routines.
To make your customers happy and to keep your business up and running, you need to know that your contract design and manufacturing service will be able to work quickly to fulfill your needs. While you want design specs and product assembly to occur in a timely manner, though, you don't want to compromise accuracy. Your outsource company should work like a well-oiled machine, with the experience, skill, and ability to work speedily and without mistakes.
Will your contracted service provider leave you high and dry after the order has been fulfilled? Some electronics companies have learned the hard way that there are businesses out there who will keep the original designs to themselves, preventing internal troubleshooting or repairs on boards. The best outsource vendors will continue to work with you after production, offering complete fulfillment services. Seek out a company that has a repair-and-return depot. Troubleshooting and correcting minor PCB issues is far more cost-efficient than simply being required to fully replace the board.
Get the design and assembly solutions that you need to thrive today. By knowing what you should expect from a contract service, you can confidently develop a strong partnership with your outsource company and become a better, more successful business.
If you need expert PCB service, feel free to contact wonderful02@wonderfulpcb.com.

2015年3月17日星期二

Multilayer PCB design method (X)

11.4.2 The electrical layer segmentation method
(2) Click the Add button, the pop-up as shown in figure 11 to 15 electric layer segmentation in Settings dialog.

As shown in figure 11 to 15 in the dialog, Track Width used to set the drawing border line Width, but also in the electric network within the same region between the insulation of the spacing, so usually will Track Width is larger. Suggest that readers will input unit when the input value. If only enter the Numbers in the film, not the input unit, the system will default to the current PCB manufacturer in the editor.

Within segmentation of the specified Layer option is used to set electric Layer, here can choose electric power & GND inside Layer. In this case, there are many kinds of voltage grade, so you need to split the Power within the electrical layer to provide different levels of voltage components.

Connect to the.net option is used to specify the divided region is connected network. Usually in electric layer is used for power supply and network layout, but in the Connect to net the drop-down list as you can see, the inner layer of the whole network can be connected to the network signal, used in signal transmission, don't just general designer. Weak signals required by the voltage and current, small requirement to the wire, and power supply current is big, need a smaller equivalent internal resistance.So general signal in signal layer line, dedicated to the power supply and electrical layer network connections.

Ms Grace Zhang
________________________________
Oversea sales
Wonderful PCB
A Floor 6, Nanyuan Fengye Mansion, Nanshan Avenue, Nanshan District, Shenzhen City 518054, China

T +86-755-86229518-809 | F  +86 755 2607 3529|  e  wonderful16@wonderfulpcb.com |
w  www.wonderfulpcb.com  | Skype:wonderful16 | MSN: wonderful16@hotmail.com

2015年3月16日星期一

Board Materials

First we should understand what materials go into a PCB. At the most basic level, the base of the PCBA manufacturer is formed out of some sort of solid, non-conductive, material. This material is then laminated with a copper (or other metal) sheet, this creates the conductive surface.
The base material is usually a type of glass-reinforced epoxy known as FR-4. This is the most common material because it is flame resistant, cheap, and of course has a low conductivity.
For higher performance circuits (RF), there are other types of materials to consider such as ceramic or PTFE bases with various fillers. Since this article is more focused on general PCB design I will not go into details about designing for RF. Fortunately the EDN Network has posted a useful article on choosing PCB materials for high frequency circuits.
Really these two materials are about all that goes into a bare PCB. When you send your design for manufacture (or do it yourself) the electrical connections are usually created by removing select copper portions of the bare PCB.

Following will be continued in next chapter.
Shirley Xia
Oversea sales
Wonderful PCB

 A Floor 6, Nanyuan Fengye Mansion, Nanshan Avenue, Nanshan District, Shenzhen City 518054, China.
T +86-755-86229518-821 / Cell phone and whatsApp:008613480796172
F  +86 755 2607 3529|
e  wonderful25@wonderfulpcb.com |
w  www.wonderfulpcb.com  | Skype:wonderful-pcb02
Welcome to our trading shows:
Booth: 9G27, HK Globalsources Oct.11-14th,2014 AsiaWorld-Expo, Hongkong
Booth:A3.274-1,2014.11.11-2014.11.14,the Electronica in Munich, Germany

2015年3月13日星期五

Prototype PCB Necessity and Benefits(2)----Wonderful PCB (hk) Limited

The PCB board manufacturing prototypes are checked in all critical conditions as everything must be checked and every problem must be solved before the production. Again, the leads and traces are re-measured so that it meets the required thickness. The VIAS and holes need individual programming for each board and their making process is also sophisticated. The tolerances and electrical signals are tested even after the addition of the surface components.
When all the components are added and it is made as the specification, it is finally tested for several times for the required result. The board must also be able to provide proper reliability and effectiveness. In this time, the board is tested without planting it in the environment it is made for. And all steps are recorded. 
And when it meets the standard quality, it is sent for production. But if any wrong occurs, it is tested again and sent for further solution. Even sometimes the whole design is changed for the failure in tests.
The prototype is made by the companies to check their products and inventions before manufacturing. And thus it helps a great deal in the development of PCB.

2015年3月12日星期四

Multilayer PCB design method

11.3 The Middle layer create and set up
Middle layer, is in the PCB layers between the top and bottom, its structure as shown in figure 1-1, readers can refer to figure the annotations to understand.  How to complete the middle layer in the process of production? Simply sandwich plate is to suppress multiple single plate and double plate, the middle layer is the original single panel and double panel at the top or bottom. In PCB production process, you first need to on a substrate (general synthetic resin materials) apply the copper film on both sides, then through light painting and other technology transfer drawings of wire connection relationship to PCB board (printed in drawing wire, welding plate and the hole coated to protect it, and prevent the part of the copper film is corrosion in the corrosion process), again by means of chemical etching (FeCl3 or H2O2 as the main component of corrosion liquid) there will be no corrosion protection of copper film laminating machine, finally complete drilling, silk-screen printing layer and so on post-processing work, such basic completed a printed circuit boards.
Similarly, multilayer PCB is in more than one plate layer adopts the suppression process again after the completion of the compressed into a piece of circuit board, and in order to reduce costs and via interference, multilayer PCB often was not much thicker than the double plate and single board, this makes the composition of multilayer PCB board layer relative to the ordinary double-layer plate and the thickness of single layer board often smaller, lower mechanical strength, higher demand for processing. So the multilayer PCB production costs compared with the ordinary double plate and the single board will be expensive.


Ms Grace Zhang
________________________________
Oversea sales
Wonderful PCB
A Floor 6, Nanyuan Fengye Mansion, Nanshan Avenue, Nanshan District, Shenzhen City 518054, China

T +86-755-86229518-809 | F  +86 755 2607 3529|  e  wonderful16@wonderfulpcb.com |
w  www.wonderfulpcb.com  | Skype:wonderful16 | MSN: wonderful16@hotmail.com