1. No matter where you are in the global electronics supply chain, you’ve probably heard the phrase, “I need it now.” In this fast-moving, ever-evolving industry, we hear that a lot.
    What drives what happens now? A critical combination of the latest technology and knowledge, which is what you’ll find at IPC APEX EXPO 2015.
    Starting with the opening keynote with Robbie Bach, former president of entertainment and devices at Microsoft and Xbox visionary, you’ll learn about the triumph of a strategic process that brought together a disparate group of talented individuals who applied entrepreneurship to build a successful consumer business within the larger Microsoft structure.
    On the show floor, you’ll see and compare equipment from more than 440 of industry’s top suppliers, discover new processes to gain greater efficiency and uncover news solutions that will help improve your bottom line.
    In keeping with the event’s theme, “Upgrade Your Tech-NOW-ledgy” the technical conference will feature approximately 100 technical papers detailing original research and innovations from industry experts around the world.
    For best practices in design, lead-free technologies, materials, process improvement, solder joint reliability, PCB fabrication and materials, quality and reliability, the more than 30 professional development courses will go beyond theory to provide practical solutions you can implement now.
    With so many outstanding courses and technical papers to choose from, and the world’s elite subject matter experts to interact with, your best registration option is the All-Access Package. This package will save you a significant amount off a la carte options, but more importantly provide the maximum learning experience for your investment.
    The All-Access Package includes the technical conference, conference proceedings, standards development committee meetings, a choice of up to five half-days of professional development courses, event essentials, luncheons, design forum, and if you’re a senior-level executive – PCB supply chain leadership or EMS management council meetings.
    If you want to upgrade your tech-NOW-ledgy, IPC APEX EXPO 2015 is THE place to be. For more information or to register, visit www.IPCAPEXEXPO.org.

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  2. Silk screen is normally used to identify components on the component side, test points, PCB and PCBA part numbers, warning symbols, company logos and manufacturer markers. It isn’t uncommon to have silkscreen required for the solder side as well. But if you are price sensitive, you need to know the work required to produce two silk screens is simply twice as much as one.

    Silk screening requires specially formulated inks. Standard colors are black, white and yellow. Non-standard colors can be requested but will impact your cost and your lead time.

    At one time, PCB CAD software allowed for a few standard fonts to be used in silk screen layers. Now many packages allow for all available system fonts to be used. Be careful when choosing your font. It may seem interesting to pick a “show card gothic” font, but remember someone may have to try and read it later.

    PCB manufacturers are required by IPC to provide both a manufacturer’s mark and an identifier which will allow for lot tracing if problems occur. Although there are no strict standards for where these markings appear, manufacturers will generally try to place them in non-critical areas. But just because you know the board will also double as a backlit equipment faceplate with your company logo doesn’t mean your PCB manufacturer will. If you require these markings to be placed in a specific area or omitted, you need to specify it in your communications with the manufacturer. 

    Screen-printing is done when the boards are still panelized prior to the application of the final finish or routing/v-scoring.

    Conventional silk-screening requires polyester screens stretched across aluminum frames. Solvent resistant emulsions are used to coat the screens prior to imaging. Both the screen and panel must be registered precisely to ensure proper alignment. This method of screening requires the following equipment: Laser photo plotter to produce the initial film, UV printer, spray developer and curing ovens. Screens can be cleaned and reclaimed to be used again although not for jobs which require high resolutions.
    Currently three methods are available for applying the “Ident” to the PCB.
    §  Manual screen-printing can be utilized when line widths are greater than 7 mil (0.007”) and the registration tolerance is 5 mil.
    §  LPI (Liquid Photo Imaging) provides more accuracy and legibility than manual screening and is employed when line widths are greater than 4mil.

    §  DLP (Direct Legend Printing) is the most accurate and legible of the 3 processes but also has the highest cost for consumables.
    The art of manual silk-screening takes time to develop. At Hampoo, our master crafts people have been practicing their art for over 12years. Some of the parameters to be considered include the viscosity of the ink, room temperature, humidity, age of the ink and hardener and line resolution. From these variables the correct amount and distribution of ink is derived and even the pressure of the stroke will impact the final outcome. Today, just like when I first joined Hampoo, I am amazed at the artworks we create in the screening department.

    PCB layout designers sometimes forget to double-check their ident layers before sending designs to PCB fabrication. Designers should avoid putting ident overtop circuit pads, should avoid using excessively tiny text and should allow for registration tolerances.
    So how can you know more about Silk-screening help you reduce your PCB costs?
    Requesting silk-screening on one side will only cut your artwork costs in half. Sticking with standard colors and larger geometries will also prove beneficial. Understanding these constraints can help you to get a better PCB pricing.

    Anout Hampoo：
    Hampoo was founded in year 2003 as a high-tech enterprise which research, development and innovation for various electronic products, and devoted to be a global leading electronic product and service provider. Hampoo, base in Shenzhen, offers one stop electronic manufacturing service for customers, including PCB design, pcb fabrication, PCB assembly and pcb components sourcing. With over 12 years experience, Hampoo has gained a lot customers on the strength of excellent service and bespoke service.
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  3. The printed circuit board technology has seen great strides in electronic manufacturing, but the general construction of pcbs hasn’t changed in many decades. A sheet of copper is bonded to an insulating material such as FR4. Generally these copper planes are added in pairs with a single plane of FR4 between the two copper planes. Using this technology, up to 16 layers in extreme cases can be bonded together to form the PCB.

    The most simple pcb design would be a 2 layer board. This would include two copper layers on the front and the back from which your component footprints, vias, and traces would be etched away. This will allow interconnect from the components and the top and bottom planes as needed. In order to keep the pcb manufacturing costs down only place components on the top side of your board. If you’re space constrained and run out of room it is permissible to place components on the backside of the board but look carefully at the soldering technology used to manufacture the board.

    Going to a 4 layer board brings about another layer that you should become familiar with. Using a pair of layers for the boards main power is called the power planes. You’ll still keep the top and bottom layers for routing your nets, and the two inner layers become your main power and ground layers. These power planes are key to making your board routable in many cases, and they are critical for high speed pcb design.

    One last thing to keep in mind is Cost. A small 2 layer pcb will probably cost you around $30 in a low quantity. An equivalent 4 layer board will cost about double that at $60. The more layers you add the more its’ going to cost. If you’re looking for a large quantity price point the 2 layer board will run you around $5 in 100 pc qty. The point here is that you should only use as many layers as your circuit design really calls for. Experience with a couple of board will be your best bet in determining how many layers you need, but until then start with 2 layers and work your way up.

     About Hampoo:
    Hampoo was founded in year 2003 as a high-tech enterprise which research, development and innovation for various electronic products, and devoted to be a global leading electronic product and service provider. Hampoo, base in Shenzhen, offers one stop electronic manufacturing service for customers, including PCB design, pcb fabrication, PCB assembly and pcb components sourcing. With over 12 years experience, Hampoo has gained a lot customers on the strength of excellent service and bespoke service.
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  4. There are many factors that can damage printed circuit boards. Today I'd like to talk about something that has damage to printed circuit boards.  Although printed circuit boards may be able to sustain high amounts of electricity and the movement of an immense amount of data from one component to the next, simple atmospheric and chemical interactions can render PCBs inert and useless. Some of these environments are overlooked often and can be incredibly damaging to circuitry. What circumstances do you need to be leery of when storing or placing these electronic devices?
    a. Areas High in Static Electricity
    Static electricity can do a great deal of damage to circuit boards especially if these devices are currently being used. Even statically charged dust can cause damage such as cleaning a computer case without shutting off the power. Your storage or project area should be free of any static creating products such as carpets and other kinds of fabric. Although it takes more static electricity to damage inert components, there is still the risk that it will.
    b. Areas High in Moisture
    Humidity and dampness can destroy electrical components. It is this reason that many project developers will utilize dehumidifiers within the project area or dry storage. While a television can certainly withstand some water damage without sustaining permanent, direct damage, any water crossing two channels on the PCB will cause a short unless it is completely dry. This is aside from the capability of developing molds on certain devices due to cold and damp areas.
    c. Direct Animal Damage
    In many warehouses and storage areas, mice and rats can deal damage to electronic products by turning wires and other PCB components into nests. Animals such as cats can ultimately destroy circuit boards by spraying urine on them. As feline urine is a similar composition to ammonia, it has the capacity to melt away many of the components on the PCB itself.
    d. Areas High in Dust
    Aside from statically charged dust particles, dust itself can be damaging if not cleaned from the PCB before use. This is often seen in electronic devices such as computers, televisions and other entertainment devices that have open ventilation. Dust acts like insulation that will reduce the efficiency of heat dissipation within any particular electronic device.
    e. Chemical Storage Areas
    Storing cleaning solutions and other chemicals near electronics can have adverse effects as well. As the fumes of some chemicals are corrosive in nature, these mixtures can slowly eat away at a PCB eventually destroying the unit. Some organizations have witnessed this outcome due to storing networking switches in cleaning closets and other areas where chemicals are often placed.
    While quality PCBs can withstand more abuse when it comes to usage, most will be affected by any of the above situations. If your project is planned to be in direct contact with any harmful environment preventative measures can save you a lot of money and time.
    About Hampoo:
    Hampoo was founded in year 2003 as a high-tech enterprise which research, development and innovation for various electronic products, and devoted to be a global leading electronic product and service provider. Hampoo, base in Shenzhen, offers one stop electronic manufacturing service for customers, including PCB design, pcb fabrication, PCB assembly and pcb components sourcing. With over 12 years experience, Hampoo has gained a lot customers on the strength of excellent service and bespoke service. 

     Contact:
    Email:info@hampoo.com
    Website: http://ems.hampoo.com
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  5. As the company’s size and business increased, Electronic manufacturing service (EMS) division of Hampoo Electronics has moved to a new office. It covers an area of 4,000 square meters. Besides office areas, the new office also has warehouse for electronics, precious material, packaging material, end product and product lab, aging room, dust-free work shop. Perfect facilities enable us to develop, design and assembly simultaneously, help to save time of new product development, and enhance production efficiency.


    This moving fully proved that Hampoo has confidence with future development in PCB business. Meanwhile, it also showed that Hampoo devoted to improve the working environment, encourage creativity. The new office for EMS division has much improved in hardware facilities and software environment, which takes staff work and study conditions to a new level. Faced with new working environment, all members of EMS division committed to do their best in the next work, and wildly expand our business.  

     

    Hampoo was founded in year 2003 as a high-tech enterprise which research, development and innovation for various electronic products, and devoted to be a global leading electronic product and service provider. Hampoo, base in Shenzhen, offers one stop electronic manufacturing service for customers, including PCB design, pcb fabrication, PCB assembly and pcb components sourcing. With over 12 years experience, Hampoo has gained a lot customers on the strength of excellent service and bespoke service. Heartfelt thanks to all new and existing customers for the company’s long support, and hampoo will provide dedicated service to return your prond love. Also welcome to visit our new office. Below is the contact for Xixiang factory.

    Contact:
    Address: 3rd Floor Internet Creative Park, NO. 2005 Xingye Rd, Bao’an District, Shenzhen, Guangdong, China, 518057.
    Phone: 86-755-8618 5500-2072
    Email: info@hampoo.com    
    Website: http://ems.hampoo.com
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    标签: electronic manufacturing service(ems) hampoo pcb assembly pcb factory pcb manufacturer
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  6. Research and Markets: Global and Chinese FPCB (Flexible Printed Circuit Board) Industry Report, 2014 | Business Wire
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  7. PCB Design Best Practices: Six things to consider when making PCB component choices based on part footprints. All the examples in this article are developed using the NI Multisim design environment, however the same concepts apply when using different EDA tools.

    1.    Think about component footprint decisions
    Throughout the schematic drawing phase, consider footprint and landpattern decisions that will need to be made in the layout phase.  See the following suggestions for things to consider when making component choices based on part footprints.

    • Remember that footprints include both the electrical pad connections and the mechanical (X, Y and Z) dimensions of the part.  This includes the body outline of the part as well as the pins that attach to the PCB.  When selecting components, consider any housing or packing restrictions on both top and bottom sides of the final PCB.  Some components (such as polarized capacitors) may have height clearance restrictions that need to be considered as part of the component selection process.  When initially starting a design, consider drawing a basic board outline shape and placing some of the larger or critically-placed components (such as connectors) that are planned to be used.  In this way, a quick virtual rendering of the board (without routing) can be visualized to give a relatively accurate representation of the relative positioning and component heights of the board and components.  This will assist in ensuring that the parts will fit inside the packaging (plastic, chassis, mechanical frame, etc…) after the PCB is assembled.  Invoke the 3-D Preview mode from the tool menu to review your board.
    • Landpatterns show the exact pads or hole shapes on the PCB to which the part will be soldered.  These copper patterns on the PCB may also contain some basic shape information.  The landpatterns need to be sized correctly to ensure proper soldering and to ensure proper mechanical and thermal integrity of the connecting parts.  When designing the PCB layout consider how the board will be manufactured or if hand soldered, how the pads will be accessed.  Reflow soldering (solder paste that is melted in a controlled oven) can handle a wide variety of surface mount devices (SMDs).  Wave soldering is typically used to solder the backside of the board to fix through-hole components but can handle some SMD parts placed on the backside.  Often with this technique, any bottom side SMDs will have to be orientated in a special direction and may to have pad modifications to be able to be soldered in this way.
    • Component choices can change throughout the design process.  Choosing which parts should be Plated Through Hole (PTH) or Surface Mount Technology (SMT) early in the design process can assist the entire planning of the PCB.  Consider parts costs, availability, part area density and power dissipation among other things.  From a manufacturing perspective SMD components are typically less expensive than through-hole parts and are typically more readily available.   For small to medium prototyping projects, larger SMDs or through-hole parts may be preferred to facilitate hand soldering and to facilitate better pad and signal access for troubleshooting and debugging steps.
    • If a footprint is not available in the database, it is common to create a custom footprint from within the tool. 

    2.    Use good grounding practices
    Make sure the design has sufficient bypass capacitors and ground planes.   When using ICs, make sure appropriate decoupling capacitors are used near the supply to a ground location (ground plane preferably).  Appropriately sized capacitors depend on the application, the capacitor technology and the frequencies involved.  When bypass capacitors are placed across the power and ground pins and located close to the appropriate IC pins, a circuit’s electromagnetic compliance and susceptibility performance will be optimized.

    3.    Assign virtual parts footprints
    Run a bill of materials (BOM) to check for virtual parts.   Virtual parts do not have footprints associated with them and will not be transferred to layout.  Generate a BOM and review all the virtual components on the design.  The only entries should be power and ground signals as these are considered virtual parts and are specially handled in the schematic environment and not the layout.  Unless used solely for simulation purposes, parts that are shown in the virtual section should be replaced with parts having footprints.

    4.    Ensure you have complete BOM Data
    Check for adequate data in the BOM report.   After running the BOM report, review it and work on populating any incomplete part, vendor or manufacturer information for all of these parts. 

    5.    Sort reference designators
    To assist in the sorting and reviewing of the BOM, ensure reference designators are contiguously numbered.  

    6.    Check spare gates 
    Typically, all of the spare gates should have the inputs connected to a signal to prevent the inputs from floating. Make sure you review any spare or forgotten gates so that unwired inputs can be adequately connected, if required.  In some cases, if the inputs are left to float, the whole system may not function properly.  For example, consider a dual opamp used in a design. If only a single opamp is used in a dual-section IC part, it is suggested that either a single-section IC be designed-in or for the unused portions, a ground be placed at the input and an appropriate unity gain (or otherwise) feedback network be placed with the amplifier to ensure the correct functionality of the part. 

    In some cases, ICs with floating pins may not correctly operate within the specifications.  Usually the operating specifications for an IC are valid only if the parts or other gates within the same part  are not operating in a saturation condition where the inputs or outputs are near or at the power rails of the component.  Simulation would typically not catch this situation as simulation models generally do not connect multiple sections of an IC together for modeling the effects of a floating connection.
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  8. Quality control is an important process to ensure PCB quality. Today, I will introduce a machine, called” flying probe tester”, which is applied in testing for small run PCB order.

    For small run orders, no fixtures need to be prepared, only data files in is need with flying probe tester. The flexibility of quick set-up ensures flying probe tests outperform dedicated test beds in lead time, cost and fixed designs. Not only shorts and opens produced has been reveal in manufacturing process by flying probe tests, but also design errors has been exposed.

    There are four to eight test heads in the tester, each equipped with a precision probe which moves to test points, vias, component pads and circuit interconnects on both sides of the OCB at very high speed. Firstly, the tester probed to search for “opens” on boards. Then short circuits “shorts” between nets will be checked. These probes are controlled by XYZ servo-systems and can contact pads only a few miles across and a few miles apart.

    Providing circuit board designs with dedicated test points adds time and cost at the PCB level. Test points at the ends of all nets, traces and edge connectors enhance testability of PCBAs but each of these points must also be tested by the flying probe. The trade off is easily in favour of PCBAs, where the cost of the circuit board ramps up. For high value and very complex circuit boards, we will typically conduct two ICT tests, one before solder masking and one after final routing.

    Flying probe testing utilizes proprietary software to evaluate Gerber files to generate an X-Y netlist. Then, it analyses the netlist utilizing a sequential path logic to ensure high fault coverage of nets. Although no test is infallible, we have electrically tested thousands of PCBs at Hampoo , and now er have not recorded and incident where a fault was missed.


    Electrical Testing is highly recommended for multi-layer PCBs as well as boards which will be populated with high value components.
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  9. The surface of pad needs to be processed to preserve from oxidize. Materials, technology and quality of PCB pad surface finish will affect the soldering technology and quality directly. Besides, choosing which method of surface finish depends on the product, technology and soldering materials. So it’s a key point to use the right surface finish to ensure the soldering quality.

    Type of surface finish:
    1 Organic Coating: soldering flux, solder mask, OSP etc.
    2 Metallic Coating: copper coating, Sn-Pb, Nickel/Gold Plating, ENP/EGP, I-Ag and I-Sn etc.

    There are three main surface finish technology, electroplating, electroless plating, immersion plating. And the materials used wildly on surface finish are Sn-Pb, Sn, Ni, Au, Pd and Ag and so on.

    a, Electroplating
    Electroplating is the process of coating a metal object with a thin layer of another metal by means of electrolysis. The electroplated coating is usually no more than .002 inch (.05 mm) thick. 

    b, Electroless Plating
    Electroless plating uses a redox reaction to deposit metal on an object without the passage of an electric current. Because it allows a constant metal ion concentration to bathe all parts of the object, it deposits metal evenly along edges, inside holes, and over irregularly shaped objects which are difficult to plate evenly with electroplating. Electroless plating is also used to deposit a conductive surface on a nonconductive object to allow it to be electroplated.

     c, Immersion Plating

    Immersion plating is the process of applying adhering layers of nobler metals to another metal's surface by dipping in a nobler metal solution ions to produce a replacement reaction. It causes the deposition of a metallic coating on a base metal from solutions that contain coating metal. In this, one metal is typically displaced by metal ions that have lower levels of oxidation potential, relative to the metal ion being displaced.
    Surface Finish Technology
    Advantages
    Disadvantages




    HASL
    1 Good solderability
    2 low cost
    3 Allow long-term process
    4 use wildly
    5 storage time more than 12 months
    1 Plate deformation
    2 unavailable for pin <20mil SMD and <40mil BGA component
    3 Easy bridging in micro distance component
    4 unavailable for HDI product




    LF HASL
    1 Good solderability
    2 low cost
    3 Allow long-term process
    4 Use wildly
    5 More than 12 months storage time
    1 Plate deformation
    2 unavailable for pin <20mil SMD and <40mil BGA component
    3 Easy bridging in micro distance component
    4 unfit for HDI product




    ENIG
    1 Electro immersion, good flatness
    2 Appropriate for micro distance component
    3 Long storage time
    4 Available for combining with wire
    1 high cost
    2 Possible have black dot on BGA pad
    3 Erosion of solder mask bridge
    4 No single sided hole plugging
            



           Immersion Tin
    1 Electro immersion, good flatness
    2 Appropriate for micro distance component
    3 Affordable cost
    4 Proper for press design
    5 Good solderability
    1 Operate with gloves.
    2 Tin whisker
    3 Erosion of solder mask bridge, must >5 mil
    4 Bake may cause other problems
    5 No single sided hole plugging




         Immersion Silver
    1 Electro immersion, good flatness
    2 Appropriate for micro distance component
    3 Affordable cost
    4 Long storage time
    1 Operate with gloves.
    2 Special package
    3 short process time on assembly
    4 Bake may cause other problems
    5 No single sided hole plugging





                  OSP
    1 Good flatness
    2 Appropriate for micro distance component
    3 Low cost
    4 Able to repair
    5 Clean, environment friendly
    1 1 Operate with gloves.
    2 short process time on assembly
    3 Limited thermal cycling
    4 Limited storage time
    5 Hard to exam.
    6 Influence of cleaning solder paste
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  10. One of the leading Printed Circuit Boards providers in the world Hampoo has confirmed that he will continue to offer direct PCB service for customers from china as the popularity of its’ PCB business continues to grow across the world.

    According to a statement released by the company, the move is aim to promote widely access to quality PCB prototypes in the near and long term future. Hampoo has confidence that these commitment will have a huge positive effect on its efforts to become one of the most revered PCB expert in the market. In addition, Hampoo has welcomed customers looking for quality PCB manufacturer to take full advantage of these recent developments. And it is easy to get quality PCB prototypes from some of the leading manufacturers in China.

    For the past decades, Hampoo has grown to become one of the biggest and most sought-after PCB prototype suppliers which located in China. The company notes that for years it has served a significant portion of customers and even in the future, Hampoo has categorically stated that it will spare no efforts in maintaining this trend. Hampoo acknowledges that even though a lot of potential customers have found it harder to access low cost and quality PCB manufacturer in china, its commitment to provide direct sales from the country will for sure change that for the better.

    The manufacturer has also revealed that it is counting on this move to maintain current growth momentum as well as expand its market share substantially in the coming months. However, the company claims that its primary goal remains to deliver quality fabrication prototypes. And as many experts and analyst in the market note, it is clear that the firm is leaving no stones unturned as it looks to cement its current position as one of the top PCB manufacturer in China.

    Moving forward, it will be very interesting to see how direct sales from china will impact the sale of printed circuit board in the US and across the world, but what remains very clear is the dedication and commitment Hampoo has shown to deliver the best and most affordable PCB product that meet all the needs of all customers. For more information on how you can work with PCB provider, please visit http://ems.hampoo.com


    Hampoo is a leading PCB manufacturer that has been in business for over 11 years. The company works with a wide range of clients and strives to deliver affordable and quality PCB service to customers. For more information, please view at http://ems.hampoo.com 
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