Category Archives: SMT

Ball Grid Array (BGA) Package

Ball Grid Array or BGA is a surface-mount package (with no leads) utilizing an array of metal spheres (solder balls) for electrical interconnection. BGA solder balls are attached to a laminated substrate at the bottom of the package. The die of the BGA is connected to the substrate by wire bonding or flip-chip technology. The BGA substrate has internal conductive …

SMT Troubleshooting (SMT / SMD Problem and Solution)

SMT (Surface Mount Technology), like other SMD Soldering and PCB assembly technology is not ZERO-Defect soldering process. There will always be some or the other defect in any Electronics PCB assembly in both Thru-Hole and SMT.

Here I will discuss some of the most common faults and causes of SMT defects and possible solution and troubleshooting.

Common Faults in SMT:

SMT Repair and Inspection Equipment

Equipment unique to surface mounting includes inspection and repair / rework equipment. Inspection equipment for surface mounting in electronics has not matured yet. There are two main types of automated inspection equipment on the market: x-ray and laser. However, most electronic companies depend on visual inspection at 2 to 10X, using either microscope of magnifying lamp.

Repair / Rework equipment …

SMT Curing / Baking Oven for SMT Soldering

There are three types of Surface Mounting: Type 1, Type II and Type III.

For Type III surface mount, components glued to the bottom of the board require curing before wave soldering. In addition, electronic components placed on the solder paste in Type I and Type II Surface Mount Technology assemblies achieve reduced solder defects (such as solder balls) by …

SMT Reflow Soldering Equipment / Machine

A reflow soldering equipment / machine is the second major equipment after pick-and-place machine in any SMT line.

There are many reflow soldering methods and each method has advantages and disadvantages. Equipment cost, maintenance cost and yield are some of the leading decision factors.

The most widely used reflow processes in electronics are: vapor phase and infrared.

Vapor phase process …

SMT Solvent Cleaning Equipment / Machine To Clean Flux with Water

After soldering, the electronic assemblies must be cleaned to remove excess solder flux. The subjects of flux and cleaning are closely intertwined. The selection of solvent and cleaning equipment depends of the flux used and the cleanliness requirements.

The cleaning process has received considerable attention because of efforts to eliminate chlorofluorocarbons (CFCs) and other ozone depleting chemicals. CFCs were …

SMT Solder Paste Screen Printer Machine for Solder Paste Screen Printing

A Solder Paste Screen Printer for SMT is needed to screen solder paste onto the printed circuit board (PCB) before placement of surface mount components.

Solder Paste Screen Printer for SMT have been widely used in electronics by the PCB industry for screen solder mask. This equipment / machine has also been extensively used in the hybrid industry for screening …

SMT Dictionary – Surface Mount Technology Acronym and Abbreviation

SMT (Surface Mount Technology) is a packaging technology in electronics that mounts electronic components on the surface of a Printed Circuit Board / Printed Wiring Board (PCB / PWB) instead of inserting them through holes of the board. SMT or Surface Mount Technology is relatively new technology in electronics and provides state-of-art, miniature electronics products at reduced weight, volume and …

Surface Mount Design Considerations in SMT & CTE Mismatching

There are many design issues that must be settled before a surface mount technology design or packaging direction is selected.

System analysts start with determining product needs in the marketplace. Therefore, the designer must look at the proposed product from the systems point of view. Great devices on printed circuit boards do not sell in the marketplace. Products sell. Therefore, …

Types of Surface Mounting in SMT

Many electronic components are not yet available in SMD for surface mounting. Due to this reason, SMT must accommodate some through-hole components. Therefore the term “Surface Mount Assembly is incomplete”. Surface mount components, active and passive, when attached to the substrate, form three major types of SMT assembly – commonly referred to as Type I, Type II and Type …

SMT Soldering and PCB Assembly Techniques

In Electronics, SMD soldering and SMT Assembly Techniques are different from that of thru-hole soldering techniques. SMD soldering or Surface Mount Technology assembly needs different SMT Equipments and greater experience and expertise.

Surface Mount Circuit Boards have flat tin-lead or gold-plated copper pads without any hole. These traces are called solder pads. Semi-solid solder called solder paste consisting of very …

SMT in Assembly Line for Manufacturing and Production of Surface Mount Technology PCB Assembly

For successful implementation of Surface Mount Technology (SMT) in the assembly line for manufacturing and production, the first order of business for management consideration is to obtain a clear outline of the outstanding technical issues. Then an SMT team consisting of a selected group of engineers / individuals from all functional organizations should be assembled to address those issues. The …

Benefits / Advantages of Surface Mount Technology (SMT) Over Through-Hole

Surface mount components are small and can be mounted on either side of the PCB and have gained widespread usage in electronics. The benefits of SMT or Surface Mount Technology are available in both design and manufacturing.

Design Benefits of Surface Mount Technology

Among the most important design-related benefits are significant savings in weight and real estate and electrical …

Printed Circuit Board (PCB) for Surface Mount Technology (SMT)

A printed circuit board, or PCB, is an integral part of electronics. A PCB is basically a substrate (normally made from glass epoxy) with conductive traces etched from copper sheets. These copper traces facilitate flow of electricity. Electronic components are soldered along this conductive pathway thus controlling the flow and quantity of electricity needed.

A Printed Circuit Board is also …

RoHS Guide in Electronics: RoHS, WEEE and Lead-Free FAQ

If you are in Electronics Industry, Electronics Assembly and Manufacturing or Electronics Rework / repairing then you must have heard of RoHS, WEEE and Lead-Free.

  1. What is RoHS (Restriction of Hazardous Substances)?
  2. What is WEEE (Waste from Electrical and Electronic Equipment)?
  3. What is Lead-Free?

Let us discuss these in detail:

What is RoHS?

RoHS stands for Restriction of Hazardous Substances. …