Package on package (PoP) is an integrated circuit packaging method to combine vertically discreet logic and memory ball grid array (BGA) packages. Two or more packages are installed atop each other, i.e. stacked, with a standard interface to route signals between them. This allows higher component density in devices, such as mobile phones, personal digital assistants (PDA), and digital cameras.
Advantages of PoP over chip stacking
There are several key differences between stacked-die and stacked-package products.
The main financial benefit of package on package is that the memory device is decoupled from the logic device. Thus: This gives PoP all the same advantages that traditional packaging has over stacked-die products:
The memory package can be tested separately from the logic package
Only "known good" packages are used in final assembly (if the memory is bad only the memory is discarded and so on). Compare this to stacked-die packages where the entire set is useless and rejected if either the memory or logic is bad.
The end user (such as makers of mobile phones or digital cameras) controls the logistics. This means memory from different suppliers can be used at different times without changing the logic. The memory becomes a commodity to be sourced from the lowest cost supplier. This trait is also a benefit compared to PiP (package in package) which requires a specific memory device to be designed in and sourced upstream of the end user.
Any mechanically mating top package can be used. For a low-end phone, a smaller memory configuration may be used on the top package. For a high-end phone, more memory could be used with the same bottom package. This simplifies inventory control by the OEM. For a stacked-die package or even PiP (package in package), the exact memory configuration must be known weeks or months in advance.
Because the memory only comes into the mix at final assembly, there is no reason for logic suppliers to source any memory. With a stacked-die device, the logic provider must buy wafers of memory from a memory supplier.
Importance of Quality Control
Quality control has to be in place in order to ensure that the final product is the highest quality possible. Creating a high quality product is important for several reasons. First, quality is what your customers demand, and if you want to keep customers purchasing your product, it has to be a quality product. Other reasons for having a quality product include: liability concerns, name recognition, branding, and maintaining your position compared to the competition in the marketplace.
There are many ways that a company can put quality control into action. Some companies will bring in third party companies to test their products before they leave the factory. These teams will be given a set of standards that the product needs to meet and they will determine if the product meets those standards. You can create a customer service department and track your quality through phone calls, customer surveys, and other methods of getting an idea of how the customers are reacting to the final product or service. This type of quality control is generally used by companies that provide a service instead of a product.
There are many other ways you can implement quality control within your company. No matter what method of quality control you choose to use, it is critical that your company practices truly control the quality of the products you are offering. Quality control will find problems and fix them. In many cases this process may also stop problems before they happen, saving your company money. Quality control keeps you from putting an inferior product on the market, which in turn keeps your company from getting a bad name in the marketplace. This is critical if you want to grow your company because putting out a quality product allows you to beat the competition and overtake their market share.
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For good visual packaging and production of any retail product, many companies wonder whether they should blister packaging or skin packaging. There are many similarities between the two packaging techniques but there are also many differences.
Of the 2 options, blister packaging that has the highest “perceived value” on the retail shelf. That is, the clean lines, glossy protective PVC outer shell and the good card graphics will be accepted as a quality packaging solution by the consumer.
Skin packaging on the other hand is often used with lower cost items and accessories which end up categorizing it as the lesser expensive, lower value proposition.
There are several considerations you should use when deciding which packaging type would be best for your product:
Types of Stretch Film
Standard or True Gauged Stretch Film– This film is what companies used and manufacturers produced for years before petroleum prices got out of hand. True gauged stretch film offers a great amount of stretch, tear resistance, and strength. The main drawback of using a true gauged hand stretch film is unneeded waste. The user does not reach the maximum stretch potential of the film.
Eco or Micron Stretch Film– This film is called different things by manufacturers, but is still considered an equivalent film. It is a step down from true gauged stretch film and often comes in a 57, 60, or 63 gauge. Many suppliers try to pass this film for a true 80 gauge stretch film. The main differences between this and the true gauged stretch film is the thickness and the amount of stretch potential. A micron stretch film is often stiffer and will not stretch as much as a true gauged stretch film. It does offer several great benefits. It is more affordable, it’s strong, and it often promotes less waste. Because the micron film has less stretch, users can often apply enough force to reach maximum stretch potential to reach the full use of the film.
Hybrid or Multilayer Stretch Film– This is also considered an equivalent stretch wrap commonly used in place of lighter gauged film. Depending on the manufacturer, this film often comes in a 47, 51, or a 53 gauge. Some suppliers often try to pass it off as a true 70 or 60 gauge. The micron stretch film is a multilayered film as well, but does not have as many layers as the hybrid stretch film. The hybrid stretch film is stiffer and has less tear resistance than the micron film. Benefits include: cost, lighter rolls, less physical exertion when applying, and stronger. The multi layers make the film stronger than a true gauged film of the same thickness. The hybrid does not come in thicker forms because the whole purpose is to use less petroleum resin.
Prestretched Stretch Film– This is a great “green” option for users wrapping lighter loads. The prestretched stretch film is a true 80 gauge stretch film stretched up to 90% of its stretch potential then placed on a roll. This makes it an affordable film that promotes less waste. Users can reach the full stretch potential when applying the film with little physical exertion. We recommend users use prestretched stretch film for loads no heavier than 1000 to 1200 lbs.
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