IPC Class Selector: Which IPC-A-610 Class Does Your Product Need?
This free IPC class selector helps engineers, quality managers, and program leads determine whether an electronics product should be built to IPC-A-610 Class 1, 2, or 3. The class you specify drives workmanship acceptance criteria, inspection depth, rework limits, and ultimately 15-30% of your assembly cost, yet it is often chosen by habit rather than analysis. Eight questions walk through the factors the IPC framework actually turns on: failure consequence, operating environment, service life, repairability, and contractual flow-downs. Your score maps to a recommended class with specific implementation actions.
1. What happens if this product fails in the field?
This is the single strongest driver of IPC class. Be honest about worst-case consequence, not typical.
2. What environment will the product operate in?
3. What is the expected service life?
4. How repairable is the product once deployed?
Products that cannot be reached or repaired in service (satellites, implants, subsea) push toward Class 3.
5. What quality requirements flow down from customers or regulators?
6. What is the product's duty cycle?
7. How does your market weigh cost against reliability?
8. Do customers require objective workmanship evidence (inspection records, certs, coupons)?
What the three IPC classes mean
IPC-A-610, the industry's dominant workmanship standard, defines three product classes. Class 1 covers general electronic products where the primary requirement is that the assembly functions: consumer devices with short lives and low failure consequence. Class 2 covers dedicated service electronics where continued performance and extended life are required and failure is undesirable but not critical: most industrial controls, network equipment, and instruments. Class 3 covers high-performance electronics where continued performance on demand is critical, downtime cannot be tolerated, and the end-use environment may be uncommonly harsh: defense, aerospace, life support, and similar applications. The classes differ in acceptance criteria for solder fill, component alignment, cleanliness, and allowable rework, not in the process steps themselves.
How this selector scores your answers
Each answer scores 0-3, where higher scores indicate stronger drivers toward a higher workmanship class, and your total converts to a percentage of the maximum. The questions deliberately mirror the language IPC uses to distinguish the classes: consequence of failure, demand for continued performance, environment severity, and the customer's need for objective evidence. No single answer forces a class by itself, but failure consequence and contractual flow-downs act as practical trump cards - if a contract mandates Class 3, the rest of the assessment only tells you how much margin the requirement has. The score-to-class mapping is:
- 0-34%: Class 1 indicators dominate; consequence and environment do not justify premium workmanship
- 35-69%: the Class 2 profile that fits most industrial and professional electronics
- 70-100%: consequence, environment, or flow-downs demand Class 3 discipline
- Failure consequence and contractual flow-downs are the questions most worth revisiting if you land near a boundary
The cost and supply-chain consequences of your class
Moving from Class 2 to Class 3 typically adds 15-30% to assembly cost through slower placement of critical joints, 100% inspection regimes, x-ray verification of hidden joints, tighter cleanliness testing, and stricter rework limits that scrap boards Class 2 would repair. It also narrows your EMS options, since genuine Class 3 capability requires certified operators, maintained equipment, and audit-ready process documentation that many contract manufacturers do not sustain. Under-specifying is worse: a Class 2 build in a Class 3 application shifts failure cost into the field, where it is one to two orders of magnitude more expensive. Mixed-class strategies - Class 3 criteria on safety-critical circuits within a Class 2 product - are legitimate and often the best economics, but they must be explicitly documented.
How Netray helps you operationalize the class decision
Choosing a class is the easy part; enforcing it through your quality system is where programs stumble. Netray configures Infor SyteLine and Infor LN quality modules to carry class requirements on item and routing records, drive inspection plans and sampling by class, and capture the objective evidence - inspection results, certs, and serial-level traceability - that Class 3 customers audit. For aerospace and defense manufacturers we implement the flow-down chain from contract clause to shop-floor work instruction, so J-STD-001 and Class 3A requirements are provably met rather than assumed. If your class decision needs to survive an audit, the ERP is where it has to live.
Frequently Asked Questions
Who decides the IPC class: the OEM or the contract manufacturer?
The OEM decides, because class selection depends on end-use consequence and market requirements the CM cannot know. IPC-A-610 itself states the customer defines the class. If you do not specify one, most CMs default to Class 2, which may be too much for a disposable consumer product or dangerously little for a high-reliability application. Put the class on drawings, POs, and the quality agreement.
How much more does Class 3 really cost than Class 2?
Industry experience clusters around 15-30% higher assembly cost, driven by tighter solder fill requirements, more inspection including x-ray for bottom-terminated components, stricter cleanliness testing, certified operator requirements, and lower rework allowances that increase scrap. The premium is larger at low volumes and on BGA-heavy designs. Materials cost changes little; the premium is process control and evidence.
Can one product mix Class 2 and Class 3 requirements?
Yes, and it is common practice. You can apply Class 3 acceptance criteria to specific safety-critical circuits, connectors, or solder joints while building the rest of the assembly to Class 2, provided the drawings identify exactly which features carry which criteria. This targeted approach captures most of the reliability benefit at a fraction of the full Class 3 premium, but it requires unambiguous documentation your CM's inspectors can follow.
Talk to Netray about wiring IPC class requirements into your ERP quality workflows so the class you specify is the class you can prove.
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