The “China Plus One” Reality Check for High-Mix, Low-Volume PCBs

For high-mix, low-to-medium volume PCB production, supply chain resilience depends as much on manufacturing ecosystems and engineering expertise as it does on geography.

If anyone sits in on enough supply chain meetings, it won’t take long before the phrase “China Plus One” comes up. It has become the prevailing corporate mantra.

Driven by tariffs, geopolitical tensions and the lingering scars of pandemic-era supply chain disruptions, OEMs and EMS providers across North America and Europe are desperately looking for the exits. Many are pointing to Vietnam, Thailand, India and Malaysia and declaring a new era of diversified printed circuit board procurement.

On paper, it sounds good. But as someone who has spent decades navigating the bare printed circuit board market and connecting Western buyers with Asian manufacturing, I need to deliver a heavy dose of reality.

The truth is, PCB demand consisting of high-mix, low-to-medium volume parts often turns a move to a “Plus One” country into a one-way ticket to longer quote times and crippling lead times.

For commodity, high-volume manufacturing, the shift makes sense. When building millions of identical consumer devices, setting up a highly automated, low-mix facility in Southeast Asia is a viable strategy.

But the North American and European OEM landscapes are largely defined by industrial, medical, aerospace (non-ITAR) and specialized tech sectors. These industries thrive on high-mix, low-to-medium volume (HMLV) orders.

And for HMLV bare boards, China still reigns supreme. It isn’t just about the factories; it’s about the ecosystem. Understanding this distinction is the difference between a resilient supply chain and a localized catastrophe.

To understand why China Plus One struggles with HMLV, it’s important to understand why China succeeds.

In regions like Shenzhen and the broader Guangdong province, manufacturers aren’t just dealing with a solitary PCB fabricator. They are plugged into the densest, most highly evolved electronics manufacturing ecosystem on the planet. If a Chinese PCB factory runs out of a specific Rogers material or specialized solder mask, the supplier is literally down the street. If a drill bit breaks, the replacement is an hour away.

This localized infrastructure allows for unprecedented speed and agility. In the HMLV world, agility is everything. Manufacturers deal with frequent revisions, unique stackups and short production runs. Chinese manufacturers have spent the last 30 years optimizing their front-end engineering (CAM) departments to process dozens, sometimes hundreds, of new part numbers every single day. Their engineers are adept at catching design flaws and issuing Engineering Questions (EQs) with lightning speed.

Now let’s look at the Plus One destinations. Moving an HMLV portfolio to an emerging PCB region immediately sacrifices that infrastructure. A factory in Thailand or Vietnam might have brand-new presses and plating lines, but where do its raw materials come from? China. Where does its chemistry come from? China.

If a factory in a Plus One country experiences a localized shortage of a specific laminate required for a low-volume medical board, it cannot simply call a supplier down the street. It has to wait for a shipment from Shenzhen. Suddenly, a standard three-week lead time stretches to six or eight weeks.

And the infrastructure gap isn’t just about material logistics; it deeply impacts quality and problem-solving.

In a high-mix environment, mistakes happen. Boards fail testing, yields drop or a plating issue ruins a panel. In China, if a batch of 50 boards is scrapped on a Tuesday, the factory can pull new material from local stock, expedite it through the line and still make the Friday shipment.

In a newly established Plus One factory, a scrapped batch is a full-blown crisis. If buffer stock of a specific material isn’t available—which is rarely the case for low-volume mix—the factory has to reorder from overseas suppliers. A simple manufacturing hiccup cascades into a month-long delay.

Furthermore, the CAM and front-end engineering talent in these emerging regions is often geared toward high-volume, low-mix production. These operations are built to set up one job perfectly and run it for a month. Present them with 20 different part numbers requiring rapid tooling, and their front-end departments choke. EQs are missed, assumptions are made and the result is bare boards arriving on the dock with glaring defects.

As a broker, I have watched EMS companies pull their high-mix spend out of China to avoid a 25% tariff, only to lose far more money dealing with scrapped boards, missed OEM delivery dates and idle assembly lines because their new Plus One supplier couldn’t handle the mix.

And then there are freight issues. The transportation systems in many of those nations are not as mature or seamless as they are in China.

Funny story: On one of my recent visits to Thailand, I visited several EMS companies hoping to discover board houses producing HMLV locally. When I asked where they sourced those bare boards, the unanimous response was, “Oh, from China.”

So if fleeing to a new geography isn’t the silver bullet for HMLV boards, what is the solution? The answer is to stay in China (or established hubs like Taiwan) while managing the supply chain with far greater sophistication.

Instead of fleeing tariffs, consolidate and negotiate existing spend more strategically. By consolidating HMLV spending with a specialized broker or directly with a carefully vetted factory, companies can negotiate better base pricing that often offsets the cost of tariffs.

There’s no need to cross borders to diversify. China is massive, making internal diversification entirely possible. If regional lockdowns or localized power grid issues are a concern, qualify factories in different provinces. Maintain a primary supplier in Guangdong and a qualified backup in Jiangsu.

Don’t just audit a factory for its equipment; look deeper into its supply chain. Ask Chinese suppliers where their materials come from and how much local buffer stock they maintain. Ensure they are financially stable enough to survive economic headwinds.

The desire to mitigate risk is understandable, but true risk management requires looking past the buzzwords. Moving high-mix, low-to-medium volume bare PCB production out of China today often means trading a manageable geopolitical risk for guaranteed operational failure.

Until the Plus One countries build out the dense, localized infrastructure and deep CAM engineering talent pools that China has spent decades perfecting, they will remain ill-equipped to deliver the agility HMLV products require. Rather than chasing the latest trend, the smarter strategy is to embrace the realities of the PCB ecosystem and build stronger, more direct relationships where the infrastructure already exists.End of article content 

Greg Papandrew has more than 25 years’ experience selling PCBs directly for various fabricators and as the founder of a leading distributor. He is cofounder of DirectPCB (directpcb.com); greg@directpcb.com.