HERMITICITY OF ELECTRONIC PACKAGES PDF

Six Sigma: Hermeticity Testing (Fine and Gross Leak) is used to determine the 1] H. Greenhouse, Hermeticity of Electronic Packages (William Andrew. As early as the s, SCHOTT’s Business Unit Electronic Packaging .. glass seal, for instance, hermeticity or seal strength, do not change as a result of. Electronic packaging is the design and production of enclosures for electronic devices ranging . Burn-in · Temperature cycling · Thermal shock · Solderability · Autoclave; Visual inspection; Hermeticity/moisture resistance.

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It provides mechanical and chemical protection of delicate components. Product safety standards may dictate particular features of a consumer product, for example, external case temperature or grounding of exposed metal parts.

The main application of vacuum impregnation porosity sealing is in boosting the packkages strength of transformers, solenoids, lamination stacks or coils, and some high voltage components. Electronic packages are sometimes made by machining solid blocks of metal, usually aluminum, into electgonic shapes.

Articles needing additional references from December All articles needing additional references. It can also package used to improve heat transfer, especially if allowed to circulate by natural convection or forced convection through a heat exchanger. Vacuum potting works best with resins that cure by polymerization, rather than solvent evaporation.

Conformal coating is a thin insulating coating applied by various methods. Examples are integrated circuit chips in ceramic Dual In-line Package form, or complex hybrid assemblies of chip components on a ceramic base plate. Gasketed metal castings are sometimes used to package electronic equipment for exceptionally severe environments, such as in heavy industry, aboard ship, or deep under water.

Electronic packaging

Aluminum die castings are more common than iron or hermiticify sand castings. It consists of a drop of specially formulated epoxy [2] or resin deposited over a semiconductor chip and its wire bonds, to provide mechanical support and exclude contaminants such as fingerprint residues which could disrupt circuit operation. An electronics assembly consists of component devices, circuit card assemblies CCAsconnectors, cables and components such as transformers, power supplies, relays, switches, etc.

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It can be mechanically strong, provides electromagnetic shielding when the product requires that feature, and is easily made for prototypes and small production paclages with little custom tooling expense. Prototypes and industrial equipment made in small quantities may use standardized commercially available enclosures such as card cages or prefabricated boxes.

Some parts may be manufactured by specialized processes such as plaster- and sand-casting of metal enclosures. They are fairly common hsrmiticity microwave assemblies for aerospace use, where precision transmission lines require complex metal shapes, in combination with hermetically sealed housings.

Six Sigma: Hermeticity Testing

Please help improve this article by adding citations to reliable sources. From Wikipedia, the free encyclopedia. Hermetic metal packaging began life in the vacuum tube industry, where a totally leak-proof housing was essential to operation.

Potting can be rigid or soft. Today it is most widely used to protect semiconductor components from moisture and mechanical damage, and to serve as a mechanical structure holding the lead frame and the chip together.

Packaging hermitiicty an electronic system must consider protection from mechanical damage, cooling, radio frequency noise emission and electrostatic discharge. Pl can be post-processed to provide conductive surfaces. When void-free potting is required, it is common practice to place the product in a vacuum chamber while the resin is still liquid, hold a vacuum for several minutes to draw the air out of internal cavities and the resin itself, then release the vacuum.

This method is used mostly in very large electrical equipment such as utility transformers, to increase breakdown voltage. Mass-market consumer devices may have highly specialized packaging to increase consumer appeal. Electronic packaging Integrated circuit packaging List of integrated circuit packaging types Printed circuit board Surface-mount technology Through-hole technology.

This also excludes dirt and conductive contaminants such as impure water from sensitive areas. Piece part costs are high, hermiticiyt there is little or no cost for custom tooling, and first-piece deliveries can take as little as half a day. Electronic packaging is the design and production of enclosures for electronic devices ranging from individual semiconductor devices up to complete systems such as a mainframe computer. It’s usually pcakages dielectric fluid, chosen for chemical compatibility with the other materials present.

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Industrial design Dlectronic Packaging microfabrication Chip carriers. Unsourced material may be challenged and removed.

It’s relatively common to find packages that contain other components than their designated ones, such as diodes or voltage regulators in transistor packages, etc.

Glop-top is a variant of conformal coating used in chip-on-board assembly COB. Some later tubes used metal cases and feedthroughs, and only the insulation around the individual feedthroughs pakages glass. Parts are submerged in a polymerizable monomer or solvent-based low viscosity plastic solution. The design of these products depends on the production method and require careful consideration of dimensions and tolerances and tooling design. High-reliability equipment often must survive drop tests, loose cargo vibration, secured cargo vibration, extreme temperatures, humidity, water hermiticiity or spray, rain, sunlight UV, IR and visible lightsalt spray, explosive shock, and many more.

Molded plastic cases and structural parts can be made by a variety of methods, offering tradeoffs in piece part cost, tooling cost, mechanical and electrical properties, and ease of assembly. Punched and formed sheet metal is one of the oldest types of electronic packaging.

In the design of electronic products, electronic packaging engineers perform analyses to estimate such things as maximum temperatures for components, structural resonant frequencies, and dynamic stresses and deflections under worst-case environments. Retrieved from ” https: