AS6081 vs AS6171 describes two separate but connected counterfeit mitigation standards. AS6081 defines how independent distributors assess supply chain risk and verify sourcing. AS6171 specifies the physical test methods used to detect counterfeit parts, covering visual, electrical, and destructive analysis. AS5553 covers OEM prevention. Together, the three standards form a layered defence.
Key Takeaways
- AS6081A alignment (April 2023): The current revision of AS6081 aligns its test method references directly with the AS6171 family, closing a gap between sourcing procedure and test execution.
- Three standards, three roles: AS5553 governs OEM manufacturers, AS6081 governs independent distributors sourcing on the open market, and AS6171 defines how counterfeit testing is actually performed.
- Five AS6171 risk levels: Parts are categorised from Critical to Very Low risk, with Models 1 and 2 giving flexibility for anything outside the Critical tier.
- Documented scale of the problem: A 2012 US Senate investigation identified more than 1,800 cases and over one million suspect counterfeit parts across defence supply chains.
- Rising incidence: ERAI reported a 35% increase in counterfeit part reports in 2022, reinforcing why these standards exist and why they keep getting revised.
AS6081 vs AS6171 vs AS5553: What Each Standard Does
Each of these standards was written for a different point in the supply chain, and confusing them is one of the most common mistakes procurement teams make. AS5553 is aimed at OEMs and manufacturers. It sets out how a company should prevent counterfeit parts from entering its own product builds, covering design controls, procurement policy, and incoming inspection at the point where components arrive on the factory floor. If you build electronics in-house, AS
AS6081: The Distributor’s Anti-Counterfeit Roadmap
If you build electronics in-house, AS5553 covers your own four walls. AS6081 covers the world outside them, the open market where independent distributors source parts that authorised channels can’t supply quickly enough or at all. AS6081A, the April 2023 revision, is the version to look for now. It tightened the test method references so they align directly with the AS6171 family, closing the gap that used to exist between “we tested it” and “we tested it to a recognised method.”
The standard works through four practical stages. First, identifying reliable sources: franchised distribution where it exists, authorised channels, and controlled-list pathways where the manufacturer has vetted the supply route. Second, assessing supply-chain risk on every part that doesn’t come through those clean channels. Risk goes up with single-source components, obsolete or end-of-life parts, sudden price anomalies, and lead-time pressure that pushes buyers towards brokers they haven’t dealt with before. Third, verification: checking incoming documentation, confirming traceability back through the supply chain, and testing to a level set by the part’s risk tier, not a flat blanket process applied to everything regardless of exposure.
The fourth stage is what happens when something looks wrong. AS6081 requires documented suspect and counterfeit part control: quarantine procedures, root-cause investigation, and reporting to the wider industry through recognised channels such as ERAI or GIDEP. That last part matters more than it sounds. A distributor that finds a counterfeit part and quietly reroutes it isn’t compliant, whatever else they do correctly. Reporting is what turns individual findings into an industry-wide early warning system, and it’s one of the clearest signs of whether a supplier takes the standard seriously or treats it as a certificate on the wall.
None of this replaces good judgement. A distributor can hold AS6081A accreditation and still make a bad call on a specific lot if the risk assessment behind it was rushed. The standard sets the process. The discipline to follow it under time pressure is down to the people running it.
AS6171: Statistical Sampling, Part Categorisation and Test Flow
Where AS6081 tells a distributor what to do, AS6171 tells a test lab how to do it. It starts with categorisation, because a resistor and a complex ball-grid-array IC don’t fail the same way and can’t be tested the same way. Parts are split into active (ICs, transistors, diodes) and passive (capacitors, resistors, inductors), then further split by complexity: simple parts with few leads, complex multi-pin SMD packages, and electromechanical components such as connectors and switches. Each category carries its own recommended test flow.
Risk level is the second axis. AS6171 defines five tiers, from Critical down to Very Low, based on how likely a part is to be counterfeit and how damaging a failure would be if it were. For anything below Critical risk, the standard allows two testing models. Model 1 favours breadth across more test methods at lower depth per method; Model 2 allows a lab to go deeper on fewer methods where that gives better coverage for a given part type. Neither is universally “better.” The choice depends on what’s actually being tested.
The test flow tables, numbered 6A through 7B in the standard, map out the sequence: visual inspection first (marking permanency, lead condition, package contamination), then material analysis (X-ray fluorescence for elemental composition, decapsulation to inspect the die), then electrical testing (curve trace comparison, functional test against datasheet parameters), then destructive analysis where the risk level justifies it.
Sample size isn’t arbitrary either. Table 10 sets statistical sampling plans that vary by risk level, part category, and which model is in use, so a test report can state with a defined confidence level that the batch is genuine, not just that the sampled units passed. AS6171-1 goes a step further with Defect Coverage Comparison and Type Confirmation calculations, giving a numeric measure of how much of the risk a given test flow actually covers. A report that cites a CDC/CTC figure is telling you something specific and checkable. One that just says “tested per AS6171” isn’t.
| Risk level | Typical part example | Model flexibility | Sampling intensity |
|---|---|---|---|
| Critical | Flight-critical semiconductors | Fixed test flow, no Model 1/2 choice | Highest sample size per Table 10 |
| High | Complex ICs, obsolete parts | Model 1 or 2 permitted | High |
| Moderate | Standard active components | Model 1 or 2 permitted | Moderate |
| Low | Common passives | Model 1 or 2 permitted | Reduced |
| Very Low | High-volume, low-risk passives | Model 1 or 2 permitted | Minimal |
When to Use Each Standard: A Decision Tree for Procurement
Most procurement confusion comes from asking “which standard is right?” when the real question is “who am I, and where in the chain do I sit?” The answer follows directly from your role.
A manufacturer building products in-house should prioritise AS5553 internally, covering design controls and incoming inspection, while requiring any distributor they buy from to be compliant with AS6081A. An independent distributor sourcing on the open market has no real choice: AS6081A compliance is the baseline, and the test lab they use, whether in-house or third-party, should be working to AS6171-aligned methods rather than an informal visual check. Aerospace, defence, and other high-reliability supply chains stack a third layer on top: AS9120 for the quality management system around distribution, AS6081A for sourcing discipline, and AS6171-certified testing for verification. None of these three standards substitutes for the others; each covers a different failure point.
| Your position in the chain | Primary standard | Supporting standard |
|---|---|---|
| OEM/manufacturer building in-house | AS5553 | Require AS6081A from suppliers |
| Independent distributor, open-market sourcing | AS6081ARelated Articles
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