Electronics Manufacturing Services (EMS) refers to services related to the industrial manufacturing of electronic assemblies and devices. EMS companies typically handle component procurement, printed circuit board assembly, and the assembly of electronic modules. The goal is the series-ready production of electronic products based on an existing hardware design.
The core of EMS services is the manufacturing of electronic assemblies. This includes producing or sourcing printed circuit boards, populating the boards with electronic components, and subsequently assembling further components. Surface-mount technology (SMT) or through-hole technology (THT) are typically used for population. Depending on the project scope, EMS service providers also handle the final assembly of complete devices, for example, with cables, connectors, or enclosures.
Another important area of responsibility is quality assurance and testing. EMS providers often carry out various testing procedures, including in-circuit tests, functional tests, or end-of-line tests. This verifies that the manufactured assemblies function electrically correctly and meet the specified requirements.
In addition, many EMS companies take on tasks in supply chain management. These include procuring electronic components, warehousing, logistics, and managing component availability. An important part of this is obsolescence management, where component end-of-life notifications are monitored so that design changes or stock-building can occur in a timely manner.
In many cases, EMS providers focus exclusively on production. If electronics development, circuit design, or layout development are also offered, this is often referred to as E²MS (Electronics Engineering and Manufacturing Services).
