2026-09-21 · Équipe éditoriale KeXinMaterials

IPC-A-620 / WHMA-A-620 Kabel- und Kabelbaum-Fertigungsstandard B2B-Leitfaden

IPC/WHMA-A-620 (ursprünglich IPC-A-620) "Acceptability of Cable and Wire Harness Assemblies" ist der Industriestandard für die Qualität von Kabel- und Kabelbaum-Baugruppen in der Elektronikfertigung.

IPC-A-620 Standard Scope + History

IPC-A-620 published by IPC (Association Connecting Electronics Industries). Co-developed with WHMA (Wire Harness Manufacturers Association). Current revision F (2024).

IPC-A-620F: Current revision (2024). Originally published 1995. Updated approximately every 5 years.

Co-development: With WHMA (Wire Harness Manufacturers Association). Official designation "IPC/WHMA-A-620".

Scope: Acceptability criteria for cable + wire harness assemblies. Covers materials, components, processes, inspection, testing.

Target audience: Aerospace, defense, medical, automotive, industrial electronics manufacturers + OEMs that buy harnesses + quality inspectors.

Length: ~600 pages. Includes detailed color photos of acceptable / unacceptable workmanship + cross-section diagrams.

Companion standard: IPC-A-610 (electronic assemblies) — covers PCB + component soldering. IPC-A-620 covers cable + wire harness.

International adoption: Used worldwide. North America + Europe + Asia. ISO/IEC does not have direct equivalent, but IPC is de facto global standard.

B2B relevance: For B2B protective cases containing electronics with cable harnesses (sensors, instruments, defense equipment), specifying IPC-A-620 is the standard procurement requirement.

Class 1 / 2 / 3 Quality Levels

IPC-A-620 defines three classes of product based on end-use criticality. Class 3 is highest quality for life-critical applications.

Class 1: General Electronic Products. Consumer electronics, non-critical applications. Relaxed workmanship standards.

Class 2: Dedicated Service Electronic Products. Industrial + commercial equipment where continued performance is desired but not critical.

Class 3: High Reliability / Life-Critical Products. Aerospace, medical, military, automotive safety. Strictest workmanship standards.

Class 1 vs 2 vs 3 - Soldering: Class 1 allows visible solder imperfections (e.g., disturbed joints). Class 3 requires perfect wetting + smooth fillet + no voids.

Class 1 vs 2 vs 3 - Crimping: Class 1 allows minor deformations. Class 3 requires exact height + width per spec with no visible defects.

Class 1 vs 2 vs 3 - Wire dressing: Class 1 allows some wire slack. Class 3 requires exact tension + routing + stress relief.

Examples: Smartphone charging cable = Class 1. Medical device cable = Class 3. Aircraft wiring harness = Class 3. Car infotainment = Class 2.

Cost impact: Class 3 typically 30-100% more expensive than Class 1 due to stricter inspection + lower defect tolerance.

B2B recommendation: For B2B protective cases, specify IPC-A-620 Class 3 for medical / defense / aerospace. Class 2 for industrial / commercial. Class 1 for consumer.

Soldering + Crimping + Wire Dressing

Three core processes in cable harness manufacturing. Each has Class 1/2/3 acceptance criteria.

Soldering (IPC-A-620 Section 3): Hand + wave + reflow soldering. Key criteria: wetting (solder flows smoothly onto pad + lead), fillet shape, no voids, no cold joints, no bridges.

Soldering Class 3: 100% wetting, no visible defects, smooth fillet, controlled solder volume. 100% inspection often required.

Soldering Class 2: 95% wetting acceptable. Minor defects tolerable. Statistical sampling inspection acceptable.

Soldering Class 1: 90% wetting acceptable. Visual defects acceptable for non-critical. 100% visual inspection.

Crimping (IPC-A-620 Section 5): Mechanical connection of wire to terminal. Key criteria: crimp height, crimp width, pull force, no exposed strands, insulation support.

Crimp pull force: Class 1 = 60% OEM spec. Class 2 = 80% OEM spec. Class 3 = 100% OEM spec. Tested per IPC/WHMA-A-620 section 5.4.

Wire dressing (IPC-A-620 Section 6): Cable routing, bundling, securing, stress relief. Key criteria: bend radius, slack, bundling tension, anchoring.

Bend radius: Class 1 minimum 4× cable OD. Class 2 minimum 6× OD. Class 3 minimum 10× OD. Tight bends cause fatigue failure.

Stress relief: Class 3 requires stress relief loops at all connector entry points + cable bundle transitions. Class 2 acceptable for low-vibration applications.

Labeling: Class 3 requires permanent labels with traceability. Class 2 acceptable for plain label. Class 1 acceptable for handwritten.

Inspection + Testing + Certification

IPC-A-620 inspection methods: visual (microscope + magnification) + mechanical (pull force, crimp height gauge) + electrical (continuity, hipot).

Visual inspection: 5-30X magnification microscope. Inspect every joint, crimp, wire termination. Class 3 100% inspection.

Mechanical testing: Crimp height gauge + pull force tester. Sample rate per IPC-A-620 sampling tables (typically AQL 1.0-4.0).

Crimp height measurement: Caliper or crimp height gauge. Compare to OEM specification. Tolerance +/-0.05mm typical.

Pull force test: Apply force to crimp until wire breaks or pulls out. Class 3 requires 100% of OEM spec.

Electrical test: Continuity test (all conductors connected end-to-end). Hipot (high potential / dielectric withstand). Insulation resistance.

Hipot test: Apply high voltage (typ 1500-2500V AC) between conductors + insulation. No breakdown. Detects insulation defects.

Continuity test: Verify each conductor path. Open / short / cross-check. Detects wiring errors.

Class 3 additional testing: 100% electrical test (vs sample for Class 1/2). Environmental testing (thermal cycle + humidity + vibration).

IPC-A-620 certification: Personnel certification through IPC training. CIS (Certified IPC Specialist) + CIT (Certified IPC Trainer). CIT can train + certify CIS at their company.

B2B procurement: Require IPC-A-620-compliant manufacturer + CIS certified operators + documented inspection records + first article + sample test reports.

IPC-A-620 B2B Procurement + Cost

B2B procurement workflow for IPC-A-620 cable harnesses + cost impact + supplier qualification.

Step 1: Specify Class level. Class 1 / 2 / 3 based on end use.

Step 2: Specify certification requirement. CIS certified operators + documented training records.

Step 3: Specify inspection level. 100% visual + sample mechanical + 100% electrical (Class 3) vs sample-only (Class 1).

Step 4: Specify documentation. First article inspection report + in-process inspection records + final inspection + traceability.

Step 5: Specify testing. Pull force + crimp height + continuity + hipot test reports.

Cost impact: Class 1 IPC-A-620 harness EUR 50-200 per assembly. Class 2 EUR 100-400. Class 3 EUR 200-800. Premium vs no standard 30-100%.

Supplier qualification: Audit supplier facility for IPC-A-620 + CIT training records + AOI or microscope inspection stations + crimp tooling calibration records.

Common B2B mistakes: (1) Specifying Class 3 but receiving Class 1 workmanship. (2) Not requiring inspection records. (3) Not auditing supplier. (4) Assuming all Asian / Mexican suppliers are equivalent.

Geographic factors: North American suppliers typically Class 2/3 capable. Asian suppliers wide range. Mexico growing Class 2 capability. Eastern Europe Class 2/3 capability increasing.

IPC vs MIL-STD vs IEC: IPC-A-620 is industry standard. MIL-STD-1553 (avionics data bus) + MIL-STD-1686 (ESD) + MIL-HDBK-454 (general electronic requirements) are defense-specific.

B2B recommendation: For B2B protective cases with embedded electronics, specify IPC-A-620 Class 3 + CIS certified operator + 100% electrical test + first article report.

FAQ

Articles connexes

• Sae As5553 As6081 Counterfeit Electronic Parts Avoidance B2B Guide
• Mil Std 810 Ip67 Ata 300 Protective Case Standard Comparison B2B Guide
• Eu Battery Regulation 2023 1542 Pas 63100 Protective Case B2B Guide
• Atex Iecex Explosion Proof Protective Case B2B Guide