... to the proliferation of smaller, more complex electronics devices such as cell phones, personal digital assistants, and notebook computers, the PCB industry is experiencing | CIRCUIT BOARDS SUPPLIERS | an overwhelming rise in demand for high-density interconnect structures (HDIS). The demand for HDIS translates directly into a vigorous market for the microvias used in | CIRCUIT BOARDS SUPPLIERS | many of these multilayer substrates as well as in conventional PCBs. In 1998, for example, the worldwide microvia market made up about four percent of | CIRCUIT BOARDS SUPPLIERS | the total multilayer PCB market. By 2007 that market share is expected to expand to nearly 30 percent (Figure 1). Figure 1. Estimates predict | | CIRCUIT BOARDS SUPPLIERS | MICROVIA BOARDS | will comprise 29 percent of all buildup boards by 2007. Worldwide, the | TOTAL MICROVIA | market approached $4 billion in 2000 | CIRCUIT BOARDS SUPPLIERS | - up 63 percent over 1999 (Figure 2).1 By the end of 2001 the market should reach $5.6 billion - up another 50 percent over | CIRCUIT BOARDS SUPPLIERS | 2000. These same data show Japan as the microvia leader, followed by Europe, Asia, and ...
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... stabilised tin/copper (SnCuNi). Although the level of efficiency of both systems is not yet completely clear, the following presents the latest information: SnAgCu There | CIRCUIT BOARDS SUPPLIERS | is more experience in the field of silver systems. Here, differentiation is made between the Sn-3.5Ag-0.7Cu, Sn-4Ag-0.5Cu and Sn-3Ag- 0.5Cu systems which vary in use | CIRCUIT BOARDS SUPPLIERS | from continent to continent. However, the agreed expert opinion (IPC/Soldertech-Conference Brussels 2003) is that the technological differences between the three systems are negligible. Sn-3.5Ag- 0.7Cu | CIRCUIT BOARDS SUPPLIERS | is the most common alloy in Europe. SnCuNi Although there are even fewer field results for the stabilised tin/copper system Sn-0.7Cu-0.1Ni, it shows a lot | CIRCUIT BOARDS SUPPLIERS | of potential. It is called “stabilised” because the addition of nickel is said to show an improved hardening reaction in soldering. The creation of needle-structured | CIRCUIT BOARDS SUPPLIERS | crystals is said to alter to rounder structures, achieving an improved soldering flow for wave soldering of PCBs (reduction in ...
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... must be supplied with each new job and should contain the following information to ensure that the finished board is to your requirements. - | CIRCUIT BOARDS SUPPLIERS | Always required even when a drill file is supplied, to enable inspection of panels immediately after drilling and finished boards prior to despatching. Hole sizes | CIRCUIT BOARDS SUPPLIERS | must be clearly represented with distinct differences between each size. Tolerances are not required unless different to our standard of +0.1 / -0.05 mm. - | CIRCUIT BOARDS SUPPLIERS | Preferred with | OVERALL MECHANICAL DIMENSIONS | including notches, cutouts and slots. Also preferred is a positioning (datum) dimension (drilled hole is best). Tolerances are | CIRCUIT BOARDS SUPPLIERS | not required unless different to our standard of + / -0.25 mm. | OTHER INFORMATION REQUIRED FOR ALL BOARDS INCLUDES: | board thickness (standard = | CIRCUIT BOARDS SUPPLIERS | 1.6mm) base copper thickness (std = 18mm) solder mask colour (std = green) solder mask type (std = liquid photoimageable) component legend colour (std = | CIRCUIT BOARDS SUPPLIERS | white) bare board testing requirement (std for multilayer ...
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