Counterfeit power semiconductors enter the supply chain through gray-market listings, recycled parts, and forged documents, and the defense is a process: know the entry paths, check the signals, verify with equipment, buy through authorized channels, and react fast when a suspect part appears. This guide covers each step.
How Counterfeits Enter the Supply Chain
The entry paths are the weak points of the demand chain. When a part is in allocation or long lead time, buyers turn to brokers and open-market listings, and that is where recycled, re-marked, and cloned parts meet legitimate demand. A recycled part is pulled from scrap and re-marked; a re-marked part is a lower-grade die relabeled as a higher grade; a cloned part is built to look like the original without the original’s qualification.
The documents travel with the parts: a counterfeit lot often carries a plausible datasheet, a certificate, and a packaging photo, all copied or assembled from fragments of the real thing. The supply chain does not announce the risk—the risk appears as a slightly different price, a different date-code spread, or a certificate that does not quite match the lot.
Red Flags in Parts and Documents
The red flags are cheap to check and worth checking on every non-authorized source. On the part, look for marking quality: a genuine power diode has crisp, consistent laser or pad printing, while a re-marked part shows a washed-out, double-struck, or irregular mark, sometimes with remnants of the original marking underneath. The package finish and the lead condition matter too—recycled parts carry solder traces, rework residue, or a polished lead surface that a fresh part does not have.
| Signal | What to check |
|---|---|
| Price far below market | Reason for the discount |
| Date-code spread | Consistency across the lot |
| Marking quality | Crispness, alignment, double-strike |
| Lead and package finish | Solder residue, rework signs |
| Certificate and datasheet | Lot numbers, wording, version consistency |
The document check runs the same discipline: lot numbers on the certificate match the parts, the datasheet version matches the date code, and the wording matches what the manufacturer publishes. Inconsistencies in the paperwork are as strong a signal as a bad marking.
Lot-Level Consistency Checks.
The lot is the unit of suspicion: the date codes across the reels, the packaging labels, the bar codes, and the lot numbers on the certificate should form one consistent story. A genuine lot arrives with coherent codes that match the manufacturer’s format; a mixed lot assembled from recycled stock shows a date-code spread, a re-printed label, or a certificate whose numbers do not match the parts. The check takes minutes at incoming inspection and catches the majority of the risk before the parts are verified electrically.
Verification Techniques and Equipment
Verification moves from the eyes to the equipment. Visual inspection and marking comparison are the first layer, and the assembly-acceptance inspection practice covers the criteria. X-ray inspection looks inside: the die size, the bond-wire pattern, and the lead-frame structure are compared against a known-good reference, because a cloned or recycled part often differs where the marking does not.
The electrical layer is decisive for power parts: forward voltage, reverse leakage at temperature, surge behavior, and thermal response are measured against the datasheet range. A re-marked lower-grade die fails the leakage or the voltage class at the hot condition, and the measurement catches what the packaging hides. X-ray fluorescence screens the materials, and decapsulation—destructive but conclusive—reveals the die itself when the stakes justify it.
Deciding How Far to Verify.
The verification depth follows the risk: a critical automotive or safety part from a non-authorized source earns the full ladder—X-ray, electrical, and decapsulation if needed—while a benign part from an authorized channel may close with visual and lot checks. The decision is recorded with the reasoning, and the sample size follows the lot’s consistency: a coherent lot needs fewer samples, and a mixed signal widens the sample. The ladder is a decision tree, and the record shows which rung the part earned and why.
Working With Authorized Channels
The strongest defense is the channel: buy from the manufacturer directly or from its authorized distribution, where the part, the documentation, and the traceability are controlled by the party that made the device. The Good-Ark official site is the entry for its products and the sales channel that confirms part status, packaging, and qualification documents.
An authorized request is specific: part number, package, quantity, and the documents needed—datasheet revision, qualification status, and material declarations—are stated up front, and the response comes from the official channel rather than a market listing. The channel removes most of the counterfeit surface before the parts arrive at incoming inspection.
The Document Set to Request.
The authorized request names the documents the design needs: the current datasheet revision, the qualification status with its conditions, the material declarations, and the packaging and lot information. The documents are confirmed against the part’s date code, and the confirmation is filed with the BOM. The document set is the same list the counterfeit market tries to imitate, and the authorized channel is the difference between a document that is true and one that is merely printed.
Incident Response Plan
The plan for a suspect part is a quarantine, not a debate. The lot is isolated, the stock is marked, and the evidence—parts, packaging, and documents—is preserved for the manufacturer’s review. The containment extends to the products already built: the affected lots are identified from the records, and the rework or replacement decision is made with the customer.
The root-cause read is the final step: which source, which broker, which order placed the risk, and what control closes the gap. The plan’s record—the suspect lot, the verification results, the containment, and the corrective action—becomes the input to the next sourcing decision and the reason the process improves.
The Supplier Scorecard.
The incident history feeds a simple scorecard: which sources delivered genuine, traceable parts, which delivered suspicious lots, and which responded constructively to the verification. The scorecard is the sourcing review’s input, and it makes the next purchase decision faster and less risky. The record is the memory the supply chain otherwise lacks.
The Verification Record’s Format.
The verification record is a table with the lot, the source, the checks run, the results, and the decision—accepted, quarantined, or escalated—for each incoming lot from a non-authorized source. The table is reviewed with the sourcing file, and a pattern across lots names the broker or the region to avoid. The record is short and useful, and it is the reason the process improves rather than repeats.
The Part-Level Electrical Profile.
The electrical verification reads the part against its class: the forward drop, the reverse leakage at the working temperature, and the surge survival are measured on samples, and the results are compared with the datasheet range and a known-good reference. A re-marked lower-grade die shows up in the leakage or the voltage class at the hot condition, and the measurement catches what the marking hides. The electrical profile is the counterfeit check that packaging alone cannot pass.
Design note. The verification steps are an escalation ladder, not a single test; the electrical and X-ray checks are read against known-good references, and the incoming-inspection sampling plan is covered by the inspection guide.
Frequently Asked Questions
How do counterfeits enter the supply chain?
Through gray-market and broker listings, recycled and re-marked parts, and forged documents that travel with the lots.
What are the red flags?
Unusual pricing, inconsistent date codes, poor marking quality, rework residue, and certificates that do not match the parts.
What verification equipment helps?
X-ray for die and bond structure, electrical measurement of VF, leakage and surge against the datasheet, X-ray fluorescence for materials, and decapsulation for conclusive die identification.
What is the best channel defense?
Buying from the manufacturer or its authorized distribution, where parts, documents, and traceability are controlled by the maker.
What do I do with a suspect part?
Quarantine the lot, preserve the evidence, identify affected products, and run the root-cause and corrective-action review.
Conclusion
Counterfeit defense is a process with five gates: know the entry paths, check the signals, verify with equipment, buy through authorized channels, and respond with quarantine and root cause. The part that reaches the board through controlled channels is the part whose reliability was actually tested.
Start at the Good-Ark official site for products and documents, and contact Good-Ark directly at sales@goodark.com or the contact page with your part number and documentation requirements.