Seminar Topics & Project Ideas On Computer Science Electronics Electrical Mechanical Engineering Civil MBA Medicine Nursing Science Physics Mathematics Chemistry ppt pdf doc presentation downloads and Abstract

Surface mount technology (SMT)



Introduction

Surface mount technology (SMT) is a method for constructing electronic circuits in which the components (SMC, or Surface Mounted Components) are mounted directly onto the surface of printed circuit boards (PCBs). An electronic device so made is called a surface mount device or SMD. In the industry it has largely replaced the through-hole technology construction method of fitting components with wire leads into holes in the circuit board.



Advantages

Smaller components. Smallest is currently 0.2 x 0.1 mm. (.01" x .005": 01005)
Much higher number of components and many more connections per component.
Fewer holes need to be drilled through abrasive boards.
Simpler automated assembly





Disadvantage

The manufacturing processes for SMT are much more sophisticated than through-hole boards, raising the initial cost and time of setting up for production.
Manual prototype assembly or component-level repair is more difficult (more so without a steady hand and the right tools) given the very small sizes and lead spacings of many SMDs.



Applications

In making PCBs which are use in every electronic device.

Surface Mount Technology

[attachment=39085]

Introduction

Surface mount technology is an easiest and prefect form of mounting components in Printed Circuit Boards. It entails making reliable interconnections on the board at great speeds, at reduced cost. To achieve these, SMT needed new types of surface mount components, new testing techniques, new assembling technique, new mounting techniques and a new set of design guidelines.
SMT is completely different from insertion mounting. The difference depends on the availability and cost of surface mounting elements. Thus the designer has no choice other than mixing the through hole and surface mount elements. At every step the surface mount technology calls for automation with intelligence.
Electronic products are becoming miniature with improvements in integration and interconnection on the chip itself, and device – to – device (D–to–D) interconnections. Surface Mount Technology (SMT) is a significant contributor to D–to–D interconnection costs.