Feature: Consumer electronics


Is the printed PCB the most undervalued component in the engineering stack?


Avoiding the pitfalls of PCB design By Dunstan Power, Director, ByteSnap Design


T


he printed circuit board (PCB) may well be the most undervalued component in the engineering stack. System developers spend months agonising over


silicon selection or fine-tuning embedded Linux kernels, yet the green (or blue, or black) slab of FR4 holding it all together is mostly treated as just an aſterthought. Tis is a huge mistake, since the PCB is oſten where a project either finds its legs or meets a premature, expensive end. Across the industry there’s a well-known


pattern: the bench-top fluke – when a prototype performs flawlessly in a controlled lab environment, only for problems to emerge months later in the field. Units that once passed every test begin failing in the real world, where temperature swings, mechanical stress and environmental factors expose weaknesses that weren’t obvious on the bench. Copper expands and contracts, vibration fatigues solder joints, and designs that look


robust in theory reveal their limits under sustained use. Tis article looks at how PCB design


decisions hold up beyond the lab, examining the common failure points across consumer, industrial and aerospace applications – and what separates designs that survive from those that don’t.


Increased failure margins in consumer tech? Tere is a persistent, even slightly snobbish attitude in some engineering circles that designing consumer electronics is easy. Te logic suggests that, because a smart home hub isn’t being strapped to a rocket, the design doesn’t need to be rigorous. Tis perspective ignores the brutal reality of the consumer market, which is that volume is a merciless judge of quality. When you are shipping half a million


units, a 0.5% failure rate isn’t a statistical anomaly, it is 2,500 angry customers and a logistical nightmare. In consumer design, the


32 July/August 2026 www.electronicsworld.co.uk


challenge is squeezing performance out of every penny. Too oſten, materials are over- specified to compensate for lack of layout optimisation. It is much easier to throw an eight-layer stack at a problem than spend three days meticulously routing a four-layer board to meet EMC compliance. I recall a project where a client was


adamant about using expensive, high-speed laminates for a basic IoT device, because they were terrified of signal integrity problems. Aſter some convincing and a few hours of simulation, we showed them that with better ground plane partitioning standard FR4 was perfectly capable. We saved them nearly £2 per unit. Over a production run, that is the difference between a profitable product and a fruitless project.


Testing PCB design to the limit If consumer design is about the balance sheet, industrial design is about survival. Industrial boards are expected to live for a decade or more, in many cases in very harsh conditions.


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44