Stewart Technology Ltd
About us
Stewart Technology is a UK-based electronics contract manufacturer, founded in 1998, providing comprehensive Electronics Manufacturing Services (EMS) to businesses of all sizes. From prototype development through to volume production we deliver cost-effective solutions without compromising on quality.
We specialise in PCB assembly (surface mount and through-hole), full box build, testing, automated optical inspection (AOI), x-ray inspection and design for manufacture (DFM), leveraging over two decades of industry experience to optimise your products for manufacturability, reliability and cost.
Our commitment to excellence is backed by ISO 9001 and ISO 13485 certification for medical devices. We continually invest in state of the art soldering and conformal coating equipment, ensuring every product meets the highest standards.
Stewart Technology is your trusted partner for precision, high-quality and cost-effective electronics manufacturing.
Products & services
Surface Mount Assembly
At Stewart Technology, our Surface Mount Technology (SMT) capabilities form the backbone of our high-quality electronics manufacturing services. With advanced Siplace placement lines, skilled technicians and strict process control, we deliver PCB assemblies that meet the highest standards of accuracy, consistency and reliability. SMT enables compact, high-density circuit designs, fast throughput and exceptional repeatability. Whatever your requirements, Stewart Technology provides dependable SMT assembly tailored to your needs. Each of our four SMT lines are fully standardised, giving us exceptional flexibility in production planning, rapid changeovers and the ability to adapt to customer needs quickly and efficiently.
Electronic Manufacturing Services
With a commitment to excellence, we specialise in the assembly of surface mount and through-hole components using advanced Siplace machinery and expert hand assembly. Our process ensures precision and reliability, from initial assembly to final product testing. Driven by a robust sage MRP system, we efficiently manage materials to deliver high-quality products directly to you or your customers.
Contract Manufacturing
We are a privately owned Contract Electronic Manufacturing (CEM) company at the heart of Scotland’s thriving electronics sector. Since establishment in 1998, the business has grown to become one of the UK’s leading providers of Electronic Manufacturing Services (EMS).
PCB Assembly Services
Stewart Technology provides high-quality PCB assembly services, supporting customers from prototype builds through to full-scale production. Our capabilities include Surface Mount Technology (SMT) and through-hole assembly, inspection and testing, and flexible manufacturing volumes. With a strong focus on quality, traceability and reliability, we work closely with customers to ensure their electronics assemblies are manufacturable, compliant and ready to scale.
Box Build
At Stewart Technology, we provide end to end Box Build Services designed to streamline your production process and deliver fully integrated, ready to ship electronic systems. Our decades of experience in electronics manufacturing means we offer precision assembly, reliable quality control and flexible support for products at any stage of development. From prototype builds to full-scale production, our complete system-level assembly service gives you a single, dependable partner capable of managing the entire device build. We excel in handling complex devices which require careful coordination and our professional team treat your products with the upmost care and consideration.
Surface Mount Technology
At Stewart Technology, our Surface Mount Technology (SMT) capabilities form the backbone of our high-quality electronics manufacturing services. With advanced Siplace placement lines, skilled technicians and strict process control, we deliver PCB assemblies that meet the highest standards of accuracy, consistency and reliability. SMT enables compact, high-density circuit designs, fast throughput and exceptional repeatability. Whatever your requirements, Stewart Technology provides dependable SMT assembly tailored to your needs.
X-Ray Inspection
Our TruView Prime X-ray system enables non-destructive inspection of hidden or internal features that optical systems can’t reach. X-rays pass through the PCB and the components, creating detailed images of internal structures such as BGA solder balls, bottom-terminated components, through-holes and multilayer board interconnections. This makes it possible to detect voids, insufficient solder, internal cracks, misalignments and hidden bridging.
Hand Assembly
Our Mascot Robotas equipment significantly enhances our hand-assembly capabilities by providing operators with guided assembly instructions, real-time visual inspection and improved process control. This technology helps ensure greater accuracy, consistency and overall product quality throughout the assembly process.
Auto-Optical (AOI) Inspection
Our Scanspection AOI systems use high-resolution cameras to capture detailed images of PCBs. Advanced software compares the images against the design specifications to detect defects such as missing or misaligned components, solder bridging and polarity errors. The system inspects boards during and after assembly, providing immediate feedback so errors can be corrected before further progression.
Conformal Coating
We offer conformal coating to protect assemblies from moisture, dust and environmental conditions. We have recently invested in an automated conformal coating machine to advance our capabilities on this.
Supply Chain Management
We provide supply chain management, sourcing components through trusted suppliers to reduce risk and improve reliability. We are flexible and can support several material supply options depending on your preference – Full customer supplied (free-issue) materials Partial customer supply, where some components are free-issued and others are sourced by us Full turnkey supply, where we manage all component sourcing When customers supply materials or components we take care of them and treat them with the same care and attention as if they were our own. All materials are handled responsibly, stored appropriately and managed within our controlled manufacturing processes.
Design for Manufacture
Our engineering team at Stewart Technology partners with you from the earliest stage of product development to optimise your design for efficient and cost-effective manufacturing. Our detailed DFM analysis includes component selection, PCB layout guidance and assembly optimisation. By incorporating manufacturability into the design process we ensure your product is built right the first time and every time after.
Wave Soldering
Our state of the art Blundell CMS400 wave solder machines work at high speed passing components over a wave of molten solder to secure components to the board. Our machines are reliable and flexible and provide us with the capabilities to solder both surface mount and through-hole components.
Selective Soldering
Selective soldering uses a precise nozzle to apply solder only to designated areas of a PCB. This process is especially useful for mixed-technology boards with both through-hole and surface-mount components. Stewart Technology operates three selective soldering machines, allowing precise control over each solder joint. This makes it possible to solder components in areas that cannot be wave soldered and manage complex or delicate board designs. Selective soldering reduces thermal stress on sensitive components and prevents solder bridging, improving overall board reliability. This high level of control ensures that even the most complex assemblies are soldered accurately, which is critical for boards with tight spacing or sensitive electronic parts. This process provides a balance of efficiency and precision, making it ideal for customers who need reliable mixed-technology assemblies, while maintaining maximum product quality.