... | Gel Time The time, expressed in seconds, required for a resin to change from a solid to a liquid and back to a | MULTILAYER CIRCUIT BOARDS FABRICATORS | solid again, due to the action of thermal input. | GLASS EPOXY |A material used to fabricate Printed Circuit Boards. The base material (fiberglass) is | MULTILAYER CIRCUIT BOARDS FABRICATORS | impregnated with epoxy filler which then must have copper laminated to its outer surface to form the material required to manufacture Printed Circuit Boards. | | MULTILAYER CIRCUIT BOARDS FABRICATORS | GOLDEN BOARD | A PCB previously found to be correct, used as a reference in comparative testing methods. | GRID A TWO-DIMENSIONAL | network consisting | MULTILAYER CIRCUIT BOARDS FABRICATORS | of a set of equally spaced parallel lines superimposed upon another set of equally spaced parallel lines so that the lines of one set are | MULTILAYER CIRCUIT BOARDS FABRICATORS | perpendicular to the lines of the other. | GROUND PLANE | A conducting surface, used as a common reference point for circuit returns shielding or | MULTILAYER CIRCUIT BOARDS FABRICATORS | heat ...
[ Multilayer Circuit Boards Fabricators ]


... of smaller, more complex electronics devices such as cell phones, personal digital assistants, and notebook computers, the PCB industry is experiencing an overwhelming rise | MULTILAYER CIRCUIT BOARDS FABRICATORS | in demand for high-density interconnect structures (HDIS). The demand for HDIS translates directly into a vigorous market for the microvias used in many of these | MULTILAYER CIRCUIT BOARDS FABRICATORS | multilayer substrates as well as in conventional PCBs. In 1998, for example, the worldwide microvia market made up about four percent of the total multilayer | MULTILAYER CIRCUIT BOARDS FABRICATORS | PCB market. By 2007 that market share is expected to expand to nearly 30 percent (Figure 1). Figure 1. Estimates predict | MICROVIA BOARDS | | MULTILAYER CIRCUIT BOARDS FABRICATORS | will comprise 29 percent of all buildup boards by 2007. Worldwide, the | TOTAL MICROVIA | market approached $4 billion in 2000 - up 63 | MULTILAYER CIRCUIT BOARDS FABRICATORS | percent over 1999 (Figure 2).1 By the end of 2001 the market should reach $5.6 billion - up another 50 percent over 2000. These same | MULTILAYER CIRCUIT BOARDS FABRICATORS | data show Japan as the microvia leader, followed by Europe, Asia, and North ...
[ Multilayer Circuit Boards Fabricators ]


... oxide, making soldering impossible. Storage possibilities of immersion tin PCBs are, for this reason, considerably limited compared with conventional SnPb techniques: stored PCBs should | MULTILAYER CIRCUIT BOARDS FABRICATORS | be used up within 3 months and if time exceeds 6 months, heavy processing problems can occur. The melting temperatures are markedly higher compared with | MULTILAYER CIRCUIT BOARDS FABRICATORS | SnPb, therefore the assembling process for many components takes place at the absolute limits of acceptance. As a result, component losses must be expected when | MULTILAYER CIRCUIT BOARDS FABRICATORS | assembled. The price of immersion tin is between that of the classical SnPb and the immersion nickel gold surfaces. However, thiourea, which is used in | MULTILAYER CIRCUIT BOARDS FABRICATORS | the production, does not conform with environmental or effluent requirements, therefore the future costs for disposing of wastes are difficult to calculate, particularly in view | MULTILAYER CIRCUIT BOARDS FABRICATORS | of the upcoming, stricter environmental regulations. CONCLUSION Immersion tin can be seen as a viable alternative, as the surface offers many advantages under the ...
[ Multilayer Circuit Boards Fabricators ]