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IPC-A-610 Class 1, 2 and 3 Reference Table

IPC-A-610 is the workmanship acceptance standard for electronic assemblies, and the class on your drawing decides how strict every inspection call is. This table lays out what the three classes mean so engineers, buyers and inspectors use the same words.

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Topic	Class 1 (General)	Class 2 (Dedicated service)	Class 3 (High performance)
Product definition	General electronic products	Dedicated service electronic products	High performance / harsh environment electronic products
Primary requirement	Function of the completed assembly	Continued performance and extended life	Continued high performance or performance on demand
Downtime tolerance	Failure is an inconvenience	Uninterrupted service desired but not critical	Equipment downtime cannot be tolerated
Typical end use	Consumer and low-cost products with limited life	Communications, business machines, instruments, industrial controls	Aerospace, defense, medical life support, critical infrastructure
Operating environment	Benign	Normal, not expected to fail from environment	Uncommonly harsh, must not fail under stress
Who sets the class	The customer, on the drawing or purchase order	The customer, on the drawing or purchase order	The customer, on the drawing or purchase order
If no class is stated	Not assumed	Not assumed, ask the customer in writing	Not assumed, ask the customer in writing
Strictness trend	Widest allowances	Tighter than Class 1	Tightest allowances on most criteria
Same condition, different class	May be Acceptable	May be Acceptable or a Defect	Often a Defect
Condition label: Target	Near-perfect, ideal result	Near-perfect, ideal result	Near-perfect, ideal result
Condition label: Acceptable	Meets the class without being ideal	Meets the class without being ideal	Meets the class without being ideal
Condition label: Defect	Insufficient to ensure form, fit or function	Insufficient to ensure form, fit or function	Insufficient to ensure form, fit or function
Condition label: Process Indicator	Not a defect, trend to watch	Not a defect, trend to watch	Not a defect, trend to watch
Process Indicator handling	Record and monitor, no rework required	Record and monitor, no rework required	Record and monitor, no rework required
Disposition of a Defect	Rework, repair, use-as-is or scrap per customer	Rework, repair, use-as-is or scrap per customer	Rework, repair, use-as-is or scrap per customer
Related workmanship standard	J-STD-001 for process requirements	J-STD-001 for process requirements	J-STD-001 for process requirements
Related inspection tool	Visual, magnification per standard	Visual, magnification per standard	Visual, magnification per standard, AOI as support
Space and military add-ons	Not applicable	Not applicable	Addendum requirements may apply when the contract invokes them
Typical audit evidence	Inspection records	Inspection records, trained inspectors	Inspection records, certified inspectors, traceability
Training expectation	Operator awareness	Trained inspectors	Certified IPC specialists commonly requested by primes

This table summarizes the intent of each class and the condition labels. It does not reproduce the standard. Numeric acceptance limits (fill percentages, wetting angles, lead protrusion) change by revision, so always read them from your licensed copy of IPC-A-610 at the revision your contract names.

Carry the IPC class into your ERP travelers

An optional short review of how your ERP can print the contract class and revision on every work order.

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How to use the table

Type a word in the search box such as defect, Class 3 or training to filter rows. Read across a row to see how the class changes the expectation. Use the export buttons to create a one-page brief for new inspectors or to attach to a quote review. The class is always set by the customer, so the first row of any program kickoff should be confirming it in writing against the purchase order and drawing notes.

What the three classes actually mean

Class 1 is for products where the assembly simply has to work. Class 2 is for products that must keep working for an extended life, such as industrial controls and telecom equipment. Class 3 is for products where failure is unacceptable, which covers most defense, aerospace and life-support electronics. The classes are not quality levels of your shop. They are the customer's statement of risk.

Class 3 is not simply Class 2 plus a margin: some criteria are identical across classes
The same visual condition can be Acceptable in Class 2 and a Defect in Class 3
A product may mix classes by assembly only if the drawing says so

Target, Acceptable, Defect and Process Indicator

Every illustrated condition in the standard carries a label. Target is the ideal. Acceptable meets the class. Defect fails it and needs a disposition. A Process Indicator is not a defect, but a rising count of them means the process is drifting. Smart shops log process indicators in the same defect log they use for defects so they can see trends before rejects appear.

Common mistakes

The most common error is inspecting to Class 2 because that is what the shop usually builds, when the contract says Class 3. The second is mixing up IPC-A-610, which is the acceptance standard, with J-STD-001, which defines the process requirements. The third is using an old revision after the contract has moved on. Record the revision and class on every traveler.

Confirm class and revision on the PO, not from memory
Keep the licensed standard at each inspection station
Train and certify inspectors for the class you build

Frequently Asked Questions

Who decides which IPC-A-610 class applies?

The customer decides and states it on the drawing, purchase order or contract. The manufacturer should not assume a class. If none is given, ask for it in writing before building, because it changes inspection criteria and acceptance decisions.

Is Class 3 required for all defense electronics?

Not automatically. Many defense programs specify Class 3, but the contract and drawing control. Some ground-support or non-critical assemblies may be Class 2. Read the contract flow-downs rather than assuming from the industry.

What is the difference between IPC-A-610 and J-STD-001?

J-STD-001 sets requirements for how soldered assemblies are made: materials, methods and process controls. IPC-A-610 describes how the finished assembly is judged, with pictures of acceptable and defective conditions. Most shops use both together.

Is a Process Indicator a reject?

No. A Process Indicator is a condition that is not a defect but shows the process is not ideal. It should be recorded and monitored so the cause can be corrected, but the assembly is accepted as is.

If your ERP carries the IPC class on the part or work order, Netray can show it on travelers and inspection plans automatically. Ask for a short review of how your quality data flows.

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