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Reliability6 min read

Parts Procurement Reliability Management: Counterfeit Identification and Source Verification

This article addresses a common but often unarticulated challenge in factories: parts procurement reliability management, specifically counterfeit identification and source verification. Using real-world examples, it elucidates methods for identifying and resolving these issues, offering immediately applicable insights.

That Day the Production Line Halted, All Because of a Single Screw

I recall one time, our production line suddenly halted, not due to equipment failure or a software bug, but because of a screw. Yes, you heard that right, a tiny screw. Halfway through that batch, engineers discovered that the fixing screw on the machine arm had loosened, leading to abnormal stability in wafer gripping, and the product yield directly dropped below 80%. We investigated further and found that the screw supplier had issues. The screws delivered had thread depths completely different from the design specifications; they simply couldn't hold firmly when tightened. This wasn't poor quality; this was clearly a "counterfeit"! It cost us a significant amount, and we had to spend time finding new suppliers and re-validating them. It truly made us furious.

In Essence, It's "Not an Original Manufacturer's Product"

You might think, "Is it that serious, just for a screw?" To be honest, in a semiconductor factory, any part failure can lightly lead to yield reduction or severely cause production line halts. The wafers we handle daily can cost tens of thousands of USD per piece; who can afford the loss? Therefore, reliability management for parts procurement, especially "counterfeit identification" and "source verification," is truly more important than you imagine.

To put it plainly, a counterfeit is a part that is "not produced by the original manufacturer, but claims to be from the original manufacturer." It might look identical, but its material, manufacturing process, and reliability are vastly inferior. It's like buying an iPhone and getting a knockoff; the appearance might be indistinguishable, but it just lags in use. However, for our machine parts, it's not as simple as "lagging in use"; they can directly explode.

So the key is, how do we avoid buying such "fakes"?

In Practice, This is How We Identify Counterfeits

  1. Supplier Qualification Review: This is the most fundamental step. We don't just randomly choose a new supplier; there must be a complete review process. For example, we would require them to provide original manufacturer authorization certificates, ISO 9001 certification, and even conduct on-site audits of their warehouses and production lines. Whether they have collaborated with major manufacturers like TSMC or UMC is also an important reference indicator.

  1. Incoming Quality Control (IQC): For every incoming part, we conduct sampling inspections.

* Visual Inspection: This is the most direct method. We check for rust, scratches, damaged packaging, or even blurry printing and inconsistent fonts. We maintain a thick "Counterfeit Catalog" filled with past cases of identified counterfeits, enabling engineers to spot irregularities at a glance.

* Dimensional Measurement: Using calipers and Coordinate Measuring Machines (CMM), we compare dimensions against design drawings. Like the screw example mentioned earlier, if the thread depth differs from the design value by 0.05mm, the Cpk value immediately drops to 1.08, leading to direct rejection.

* Functional Testing: For critical parts, we directly install and test them. For example, for power supplies, we run full-load tests for 24 hours to ensure voltage stability DPMO can be controlled below 6210.

  1. Traceability Requirements: Every part must have a batch number, traceable to its production date, batch, and even the raw materials used. If the supplier cannot provide this information or if the information doesn't match up, then something is amiss.

So the key is, you must establish controls upfront, rather than waiting for problems to occur before trying to extinguish fires.

The Most Common Pitfall: "Quality Goods" with an Unbelievably Low Price

The most outrageous incident I've heard of was when a certain supplier, to win a bid, quoted 30% lower than competitors. Our procurement department was tempted, thinking they could save a sum. However, when the first batch of goods arrived, they looked fine externally, but upon machine testing, the lifespan of the parts was directly halved. Only later did we discover they sourced their goods from small traders without any original manufacturer authorization; the parts were "reclaimed" or "refurbished" goods. Although the exterior was well-processed, the internal components had already aged. That time, we lost even more time and money dealing with subsequent issues.

Frankly speaking, price is always a temptation. But when a price is "sweet" to the point of being unbelievable, you need to exercise extra vigilance. There's no such thing as a free lunch, and certainly no cheap, abundant, and reliable parts.

One Thing You Can Do Today

Go back and check if your suppliers' "original manufacturer authorization certificates" are the latest version.

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