Surface Mount Assembly

Surface Mount Assembly (SMT)


ESD’s electronics assembly production facility operates in a controlled ESD environment. Once programmed the fully automated machines allow total flexibility, enabling ESD to supply low to high production quantities.

ESD’s automated pick and place machines enable high speed placement of fine pitch SMD components.

Our Automated Optical Inspection (AOI) machines inspect surface mount assemblies. These machines check the component markings for component type, value and orientation.

Our reflow oven has several temperature zones. The oven is programmed with a temperature and speed profile according to the PCB material and components. Profiling is used to ensure maximum yields and joint integrity for each SMD assembly.

Component Sourcing

Customers are welcome to free-issue some or all of the components or pcbs for their Printed Circuit Board assemblies. Alternatively ESD’s experienced purchasing team can take on part / all of the procurement process for you. We use established local & global suppliers to procure components as specified. ESD hold a large stock of standard components and can advise which of these are on your bom if you prefer to part-source.


Customers can prove their designs using ESD’s PCB assembly prototype service. This service includes the PCB and component sourcing and assembly. We will give feedback on the PCB layout in terms of design for manufacture on request.


At ESD we process a number of PCB materials, from flexible PCBs to standard FR4 and Aluminium boards. The size of the PCBs handled varies from very small to panels upto approximately A3 in size (and occasionally larger). The PCBs can be Single or Double sided.

How Does SMT Assembly Work?

A layer of paste is applied to the PCBs using a paste stencil. The PCB then goes through a pick and place machine which has the components for the specific electronic assembly. The robot inside the machine then selects the specified components, identifies and places them in their pre-programmed locations. The PCB then travels on a conveyor through a reflow oven to be cooked.

Advantages of  SMT

SMT produces electronic circuits with components which are mounted directly onto the surfaces of the PCB. Components are generally smaller than their through-hole counterparts because they sit on pads instead of having legs.

  • Smaller components enable higher density
  • Low initial cost and production time
  • Simpler and faster Assembly process which reduces both time and hence cost
  • Any minor errors in the component placement are automatically corrected
  • The PCB can be smaller than an equivalent through hole circuit
  • Components can be placed on either side of the PCB
  • Fewer holes need to be drilled in the PCB