Key Takeaways

• Connected devices need careful PCB assembly: fine-pitch parts, BGAs and RF sections that are sensitive to placement, shielding and grounding.
• Radio modules, chipsets and memory can go end-of-life quickly, so obsolescence planning should start at design.
• For products that handle sensitive data, ask which site will build them and what that site is certified to.

An IoT or connected device is only as good as the board inside it. Most connected products combine fine-pitch components, a radio, an antenna and firmware in a small enclosure, and many are expected to work in the field for ten years or more. Choosing who builds them is a decision about signal performance, supply continuity and data security as much as price.

This article explains what UK OEMs should look for when they outsource the manufacture of IoT devices, network equipment and other communications electronics, and how NOTE UK supports these programmes across its six UK sites.

What counts as communications electronics?

Communications electronics covers any product whose main job is to send, receive or route data. In practice that includes:

• IoT devices and sensors
• Network products and switches
• Optical data transmission equipment
• Satellite-based systems
• RF and antenna technology
• Smart home and smart building products

These products have a few things in common that shape how they should be built: dense boards, radio performance that depends on how the board is assembled, long field lives and components that change quickly.

Why is PCB assembly harder for connected devices?

A typical IoT or network board packs fine-pitch SMT components, BGAs and mixed-technology parts into a small footprint. BGA joints sit underneath the package where no one can see them, so X-ray inspection is the only reliable way to check them. Automated optical inspection (AOI) covers the visible joints. At NOTE UK both are standard on this kind of work, with assembly to IPC-A-610.

Radio sections add another layer. Signal performance depends on component placement, grounding and shielding as well as on the layout itself. Your engineers own the RF design. What a manufacturer adds is a controlled process that builds that design the same way every time, including shielding integration and careful handling of controlled impedance boards.

The cheapest point to catch a problem is before the first build. A design for manufacture (DFM) review looks at component placement, test access and solderability while changes still cost very little. Our article on why design for manufacture decides product cost goes into this in more detail.

How do you plan for short component lifecycles?

Communications products live with a tension. Radio modules, chipsets and memory can go end-of-life within a few years, yet the product itself may be in the field for ten years or more. If no one is watching, the first sign of trouble is a part you can no longer buy.

The answer is to plan for it from the start: monitor lifecycle status on the bill of materials, agree approved alternative parts early, and make last-time buys from a forecast you trust. We cover this in After the Launch: obsolescence, repairs and spares.

What should you ask about data security in manufacturing?

Some connected products carry encryption keys, are provisioned during production or end up in secure environments. For these, ask how the production area is controlled, who has access and what build records are kept.

Within NOTE UK, ISO 27001 is held at STI Hook and STI Poynton, so programmes with formal information security requirements are usually placed at those sites.

It is also worth being clear on product compliance. NOTE UK applies CE labels under customer instruction, but certification responsibility stays with the customer as the product owner.

Can one partner take you from prototype to volume?

Changing manufacturer between prototype and production means re-qualifying, re-learning and often re-designing. Connected products move fast, and those delays cost launch dates.

NOTE UK supports communications programmes from NPI and fast-turn prototyping through to volume production across six UK sites: Windsor, Haddenham, Basildon, Wolverhampton (Kasdon), STI Hook and STI Poynton. Where a product needs to ship as a finished unit, our box build work is led from Haddenham. For customers who need capacity in other regions, the wider NOTE Group has facilities in Sweden, Finland, Estonia, Bulgaria and China.

Six questions to ask your EMS partner

1. How do you inspect BGAs and fine-pitch joints? Look for X-ray and AOI as standard, not as an extra.
2. How will you handle the RF sections of my board? Ask about shielding, grounding and placement control.
3. Who monitors component lifecycles, and how far ahead? You want warning measured in months, not weeks.
4. Which site will build my product, and what does that site hold? Certifications are held by individual sites, not by groups.
5. Can you take me from prototype to volume and box build? Fewer handovers mean fewer surprises.
6. What happens when a unit comes back from the field? Repair, test and spares should be planned, not improvised.

How NOTE UK supports communications programmes

We build IoT devices, network products, optical and satellite-based systems, RF and antenna technology and smart building products for UK and international OEMs. You can read more on our communications electronics manufacturing page, or talk to our team about your next programme.

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At NOTE 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 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 UK, source bare boards from specialist PCB fabricators and then perform the assembly process. Some offer both under one roof; NOTE 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 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 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 UK – What We Deliver

NOTE 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 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 UK’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 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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