Navigating the Deepest Valley: Why the Shift to Mass Production Is Silicon’s Hardest Hurdle
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By Iman Madadi, Cofounder and CIO at Qualinx BV.
Every semiconductor product follows a journey from concept to commercial reality. While the outside world often focuses on the moment a chip is announced or enters production, the path between tape-out and volume manufacturing is far more complex than it may appear. A semiconductor device matures through several stages, each serving a different purpose and providing a different level of confidence in the final product. These stages help engineers, customers, and manufacturers progressively reduce uncertainty and transform a design into something that can be trusted in the field.
The transition from first silicon to a production-ready device is rarely a simple process. Instead, it is a structured progression in which measurements, validation, customer feedback, and manufacturing experience gradually reveal both the strengths and weaknesses of the design.
So, let us examine what these stages represent and why each of them plays a critical role in the lifecycle of a semiconductor product.
Engineering Sample
The Engineering Sample (ES) is the first physical realization of the design. Produced in limited quantities, it marks the point where simulation gives way to measurement and assumptions are confronted with reality.
Crossing the gap between software simulation and physical silicon is often considered the first productization valley in hardware development. Passing tape-out and getting first silicon to power up in the lab proves that the fundamental physics and architecture work, but it is only the first of two critical hurdles.
A common misconception is that first silicon should immediately meet all specifications. In practice, that is rarely the objective. The primary purpose of an Engineering Sample is to provide data. Engineers use it to understand how the device behaves under real operating conditions, verify key design assumptions, and identify areas requiring improvement.
This stage often uncovers effects that could not be fully predicted through modeling alone. Process variation, analog behavior, interactions between subsystems, and unexpected operating conditions may all reveal themselves for the first time. While discovering issues may appear to be a setback, it is in fact one of the outcomes of first silicon. The Engineering Sample exists to expose reality, not to prove perfection.
Customer Samples and Minimum Viable Products
As the design matures, the next milestone is often referred to as the Minimum Viable Product (MVP) or Customer Sample (CS). At this stage, the device has reached a level of stability that allows selected customers to begin evaluation and integration into their own systems. Software development can proceed, system-level testing can begin, and real-world use cases can be explored beyond the controlled environment of the laboratory.
The transition from Engineering Sample to Customer Sample is significant because the product leaves the hands of the design team and enters a much broader set of operating conditions. Customers frequently test devices in ways that internal teams never anticipated, exposing new limitations and opportunities for improvement.
The objective is not necessarily to eliminate every remaining issue. Rather, it is to understand the remaining limitations sufficiently well that they can be documented, managed, and addressed through future revisions when necessary. In many cases, this stage provides some of the most valuable feedback in the entire development cycle because it reveals how the product performs in actual applications rather than idealized test scenarios. Because MVP feedback often triggers substantial architectural and physical design revisions, the final Production Sample can end up looking radically different from the original Engineering Sample.
Production Samples and Manufacturing Readiness
The Production Sample represents a different level of maturity altogether. At this point, the discussion shifts away from whether the device works and toward whether it can be manufactured consistently and economically at scale.
A semiconductor that performs well in the laboratory may still face significant challenges when produced in large quantities. Manufacturing introduces new variables, including process variation, packaging effects, temperature extremes, voltage tolerances, long-term reliability, and test coverage requirements.
Consequently, a substantial portion of engineering effort focuses on ensuring repeatability. Yield optimization, production screening, calibration strategies, quality control procedures, and manufacturing test flows become essential elements of product development. The goal is no longer to validate functionality alone. The goal is to demonstrate that every device leaving the factory will meet the required specifications throughout its operational lifetime.
The Gap Between Working and Shipping
One of the realities often overlooked outside the semiconductor industry is the magnitude of the gap between first silicon and volume production.
If reaching first working silicon is the first milestone, turning that working silicon into a repeatable, high-yield product is the next and often more demanding phase. While the first phase tests whether the design works at all, the second one tests whether extensive modifications—driven by intensive Customer Sample evaluations—can transform first silicon into a robust, volume-manufacturable product. This is the deeper productization valley that Qualinx has successfully passed, marking an important step in the transition from working silicon to production readiness.
A chip that successfully demonstrates functionality is only at the beginning of its journey. Between Engineering Sample and Production Sample, a product may undergo multiple silicon revisions, firmware updates, calibration refinements, packaging modifications, manufacturing improvements, and extensive customer validation.
This period is sometimes referred to as the "Hardware Gap". It is the stage where engineering effort shifts from proving functionality to ensuring repeatability, manufacturability, and long-term reliability. The challenge is not proving that the chip can work. The challenge is proving that it works under all expected operating conditions, across manufacturing variations, over temperature, voltage, and throughout its intended lifetime. In other words, there is a fundamental difference between demonstrating functionality once and guaranteeing performance millions of times.
Conclusion
A useful way to view the semiconductor lifecycle is to recognize that each stage answers a different question. The Engineering Sample asks whether the physics and architecture behave as expected. The Customer Sample asks whether the product solves real-world problems in real customer systems. The Production Sample asks whether the device can be manufactured repeatedly, reliably, and economically at scale.
Reaching first silicon is just the beginning. Reaching production readiness is a major achievement altogether. In the laboratory, engineers are proving physics. In production, they are proving control.
The semiconductor lifecycle is therefore not a single leap from tape-out to commercial success, but a disciplined progression through critical milestones that gradually transforms a design into a product that customers can trust in volume.
About Qualinx
Qualinx is a deep-tech fabless semiconductor company redefining the connected edge by making ultra-low-power connectivity accessible to every application and device. Originating from research at TU Delft, Qualinx’s Digital Radio Frequency (DRF) technology enables highly efficient, reconfigurable GNSS and IoT chips designed for scalable, real-world deployment and long device lifecycles.
Headquartered in Delft, The Netherlands, Qualinx is a privately held company backed by Invest-NL, FORWARD.one, InnovationQuarter Capital and Waterman Ventures. Follow Qualinx on LinkedIn or learn more at https://qualinx.io.
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