Key takeaways

• Box build has moved from the last step in a build to a strategic service in its own right.
• OEMs want one accountable partner for the whole product, not a chain of suppliers.
• Products in EV, medtech and industrial markets are more complex, so electromechanical skills matter more.
• Building and testing in the UK, with global sourcing, gives OEMs more control over their supply chain.
• Certified quality systems now set box build partners apart, especially in regulated sectors.

For years, box build was treated as the final, almost admin stage of an electronics programme. The finished PCB went into an enclosure, got wired up and was shipped.

That view is now out of date. Across contract electronics manufacturing, box build and mechanical integration have become some of the most important services an EMS partner offers.

At NOTE Haddenham, this is already how the site works. Here are four trends behind the shift, and what they mean for OEMs choosing a manufacturing partner.

1. From component supplier to full product partner

OEMs are moving away from one-process suppliers towards end-to-end partners. They don’t want to manage separate suppliers for PCB assembly, cable harnessing, mechanical parts and final assembly. Instead, they want one partner who can take a product from design and prototype to a tested, labelled and packed unit, ready for their customer.

NOTE Haddenham is built around this model. The team covers sourcing, sub-assembly, full box build and system integration. For customers, that means:

• fewer handoffs between suppliers
• less risk of quality gaps
• a shorter time from design sign-off to shipped product

2. More complex products, especially in EV and medtech

Products are getting more complex. Power electronics, EV systems and medical devices all ask more of the parts around the PCB: enclosures, thermal management, connectors, wiring and sub-assemblies. These now matter as much to performance as the board itself.

So OEMs need partners with real electromechanical skills, rather than PCB assembly with basic enclosure fitting. NOTE Haddenham’s 37,000 sq ft facility was set up for this work. It handles both mechanical and electronic parts at scale, and supports complex projects across sectors, including a fast-growing EV workload alongside industrial and medtech programmes.

3. Supply chain resilience and UK-based assembly

After years of global disruption, OEMs want more control over their supply chains. Many now look for a partner who can source parts globally, then carry out final assembly, integration and test in the UK. This mix gives them the cost benefits of global sourcing, while keeping quality, visibility and speed at the final stages of production.

NOTE Haddenham does both: it manages offshore sourcing of mechanical and electronic parts, and carries out final assembly on site. Customers get a flexible route from parts to finished, tested product, without relying on one overseas factory for the whole build.

4. Quality and compliance as a real differentiator

More box build work now serves regulated sectors, such as medical devices and industrial safety equipment. In these markets, traceability and certified quality systems show that a partner can be trusted with complex builds.

NOTE Haddenham holds ISO 9001, ISO 14001 and ISO 45001. Quality, environmental and health and safety standards apply at every stage, from enclosure assembly and cable harnessing to functional testing, compliance checks and final packaging.

What this means for OEMs

All four trends point the same way. Box build and mechanical integration are where reliability, lead time, cost and compliance come together, and where the right EMS partner adds the most value.

NOTE Haddenham brings decades of box build experience, a large facility designed for complex electromechanical work, and certified quality systems. That puts the team in a strong position to help OEMs turn product ideas into finished, tested products.

To talk about your next box build programme, get in touch with the NOTE Haddenham team at info.note@note-ems.co.uk.

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At NOTE in the UK, PCBA is one of our core manufacturing capabilities. We deliver it across six UK sites, to ISO 9001 and IPC-A-610 standards, for customers in MedTech, Defence, Industrial, Communications, and GreenTech. This page explains what PCBA is, how our process works, and what makes NOTE in the UK a reliable long-term manufacturing partner for your assemblies.

What is PCB Assembly (PCBA)?

A printed circuit board (PCB) on its own is just a substrate – a laminated board of glass-reinforced epoxy (typically FR4) etched with conductive copper tracks and pads. It has no function until components are placed and soldered onto it. That process – placing components and creating reliable electrical joints between them and the board – is printed circuit board assembly, or PCBA.

PCBA should not be confused with PCB fabrication (the manufacture of the bare board itself). Fabrication produces the board; assembly populates it. Most contract electronics manufacturers, including NOTE in the UK, source bare boards from specialist PCB fabricators and then perform the assembly process. Some offer both under one roof; NOTE in the UK sources bare boards through our supply chain network and focuses on delivering high-quality assembly, test, and integration.

The PCBA Process – Step by Step

Modern PCBA combines automated machinery with skilled human inspection and intervention. The specific steps depend on the technology type – surface mount (SMT), through-hole, or a combination – but the core sequence for an SMT assembly is as follows.

PCBA Technology Types

The three main assembly technologies each suit different component types and product requirements.

PCBA Quality Standards — IPC-A-610 Explained

The internationally recognised workmanship standard for PCB assembly is IPC-A-610, published by IPC (the Association Connecting Electronics Industries). It defines three classes of acceptability, each specifying increasingly strict criteria for solder joint geometry, component placement, and cosmetic acceptability.

NOTE in the UK applies IPC-A-610 Class 2 as standard across all commercial and industrial PCBA programmes. IPC Class 3 is applied for medical device assemblies under ISO 13485, defence electronics under AS9100, and any programme where the customer specifies it. Our operators and inspectors are trained and certified to IPC-A-610 requirements.

Lead-Free and RoHS-Compliant PCBA

The RoHS Directive (Restriction of Hazardous Substances) restricts the use of lead and five other hazardous materials in electrical and electronic equipment placed on the EU and UK markets. NOTE in the UK manufactures to RoHS and REACH requirements as standard, using lead-free solder alloys (typically SAC305 – tin, silver, copper) across our production lines.

Lead-free reflow requires higher peak temperatures than traditional tin-lead processes, which has implications for component selection, PCB laminate grade, and oven profiling. Our process engineers manage this during DFM review to ensure component ratings and PCB materials are compatible with lead-free assembly.

Where programmes require leaded (SnPb) assembly – for example, some defence or space applications where RoHS exemptions apply, or legacy products where component availability constrains the BOM – we can accommodate leaded processes within our qualified process capability. This should be confirmed at the quotation stage.

PCBA at NOTE in the UK – What We Deliver

NOTE in the UK delivers PCBA across six manufacturing sites in England: Windsor, Haddenham, Basildon, Wolverhampton, and through our STI sites at Hook and Poynton. Our capability covers the full technology spectrum and the full volume range.

Assembly Technology

• Surface mount technology (SMT) – high-speed automated placement and reflow
• Through-hole assembly – manual and automated insertion, wave and selective soldering
• Mixed-technology boards – SMT and through-hole combined in a single programme
• Fine-pitch, BGA, QFN, and other advanced package types

Inspection and Test

• Automated optical inspection (AOI) – standard on all assemblies post-reflow
• X-ray inspection – available for BGA and hidden-joint verification
• In-circuit test (ICT), functional test, flying probe and boundary scan (JTAG) – to customer test specification
• First article inspection (FAI) with documented approval records

Quality and Certification

• ISO 9001 – quality management across all sites
• ISO 13485 – medical device manufacturing
• AS9100 – aerospace and defence (STI, Hook and Poynton)
• IPC-A-610 Class 2 standard; Class 3 available for high-reliability programmes
• Lead-free (RoHS/REACH) as standard; leaded processes available where specified

Volume and Scalability

• Low-volume NPI and engineering prototypes
• Bridge production and ramp builds
• High-volume serial production – scalable across our six-site UK network
• Multi-site capacity for dual-sourcing or volume overflow

Integration with Wider Manufacturing

PCBA at NOTE in the UK does not exist in isolation. Our manufacturing capability extends to cable and harness assembly, box build and system integration, functional test, and 3PL fulfilment – all managed under one contract. For customers who need a complete product, not just a board, we can take the PCBA output and continue through to a finished, tested, packaged product ready for despatch to your customer.

Sectors We Serve

NOTE‘s PCBA capability supports customers across five market sectors, each with distinct quality, traceability, and regulatory requirements.

• MedTech – ISO 13485-certified PCBA for diagnostic equipment, patient monitoring, surgical instruments, and life-support systems. Full component traceability, validated processes, and first article inspection as standard.
• Security & Defence – AS9100-certified, IPC Class 3 PCBA for mission-critical electronics. Secure production environments, EMI and environmental test capability, zero-failure-tolerance workmanship.
• Industrial – Durable, long-lifecycle assemblies for automation, process control, and power electronics. Typically IPC Class 2 with functional test to customer specification.
• Communications – High-throughput PCBA for infrastructure, networking, and connectivity products. Scalable capacity and supply chain agility for volume programmes.
• GreenTech – PCBA for renewable energy, EV charging, and energy management systems, where reliability in demanding environments is essential.

How to Work with NOTE in the UK on PCBA

The fastest way to get an accurate quotation is to provide us with your Gerber files or a full BOM with approved manufacturer parts, assembly drawings, target annual volumes, and any specific quality, certification, or test requirements. Our engineering team will review DFM and DFT considerations at the quotation stage, flagging anything that could affect cost, yield, or lead time before production starts.

We work with customers at every stage: from first prototype and NPI builds, through bridge production, to volume serial manufacture – with the same team, the same processes, and no re-qualification needed as volumes grow.

Frequently Asked Questions – PCBA

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Choosing the right manufacturing partner is a critical step in bringing a medical device to market. Beyond technical capability, you need a partner who understands compliance, supports your growth, and delivers the consistent quality expected within the MedTech sector.

Below, we outline five important considerations to help guide your decision.

1. Proven Quality Management Systems

Quality is at the heart of every medical device. A strong manufacturing partner should operate to recognised and accredited standards that demonstrate a commitment to patient safety and product reliability.

Key certifications to look for include:

• ISO 13485 – the global standard for medical device quality management
• ISO 9001 – consistent quality processes across all operations
• ISO 14001 – responsible environmental practices

These certifications indicate robust processes, well‑managed documentation, and a continuous improvement culture — all essential for delivering dependable products.

2. Regulatory Compliance Expertise

Medical devices must meet strict regulatory requirements. Your manufacturing partner should understand the full compliance landscape and provide the documentation and traceability needed to support your approvals.

Important areas include:

• Knowledge of CE, UKCA, MDR, and FDA requirements
• Validation and risk management processes
• Well‑structured technical documentation
• Full material and process traceability

The right partner helps you navigate regulatory steps efficiently, reducing delays and avoiding unnecessary rework.

3. Medical Manufacturing Capabilities

Medical products often require specialist processes, controlled environments, and highly skilled technicians. When assessing potential partners, consider whether they can confidently support your device’s technical needs.

Look for capabilities such as:

• Dedicated medical device production areas
• PCBA, box build, cable assembly, and system‑level assembly
• Automated soldering and inspection technologies
• Experience with products similar to yours

A partner with the right expertise ensures your device is manufactured consistently and to the required standards.

4. Testing and Full Traceability

Reliable testing is essential to ensure every device performs exactly as intended. A strong EMS partner will offer comprehensive testing solutions tailored to your product.

Typical services include:

• Functional and in‑line testing
• AOI and other automated inspection methods
• Dedicated test development
• Serialisation and complete traceability
• Data capture and reporting

This level of control supports reliability, customer confidence, and audit readiness.

5. Scalability and Long‑Term Support

Your needs will evolve — from early prototypes through to full‑scale production and eventual product updates or end‑of‑life planning. A capable partner should support every stage of this journey.

What to look for:

• Prototype and NPI support
• Smooth transition from low to high‑volume production
• Responsive forecasting and scheduling
• After‑sales services, repairs, and lifecycle management

A long‑term partnership ensures continuity, reduces risk, and supports your product’s commercial success.

Final Thoughts

Selecting a medical device manufacturing partner is about more than production capability. It’s about finding a team you can trust — one that understands the regulatory landscape, delivers consistent quality, and supports your product at every stage of its lifecycle.

By focusing on quality systems, compliance expertise, technical capabilities, testing processes, and scalability, you can make a confident and informed decision.

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NOTE in the UK Achieves ISO 13485:2016 Certification: A Commitment to Quality in Medical Device Manufacturing

NOTE in the UK is proud to announce ISO 13485:2016 certification at our Basildon facility, reinforcing our commitment to excellence in medical device manufacturing. This internationally recognised standard ensures that our quality management systems meet the stringent requirements for the design, production, and servicing of medical devices.

Why ISO 13485 Matters

ISO 13485:2016 is the benchmark for organisations operating in the medical technology sector. It focuses on risk management, regulatory compliance, and process control—critical elements for patient safety and product reliability. By achieving this certification, NOTE UK demonstrates its ability to deliver high-quality, compliant solutions for healthcare customers.

What This Means for Our Customers

Our certification provides assurance that NOTE in the UK is a trusted partner in the medical supply chain. From PCB assembly to full box build, our processes are validated to meet the rigorous standards of the medical industry. This achievement complements NOTE Group’s wider commitment to quality, sustainability, and continuous improvement.

Our Approach to Quality

We integrate ISO 13485 principles into every stage of production, ensuring traceability, robust documentation, and strict adherence to regulatory frameworks. This enables us to support customers throughout the product lifecycle – from prototyping and development to full-scale manufacturing.

ISO 13485:2016 is more than a certification – it’s a promise of quality, safety, and reliability.

Learn more about our medical manufacturing capabilities and how NOTE in the UK can support your next project.

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