What files do you need to evaluate a PCBA project?

Send Gerber files (RS-274X or ODB++), a BOM with manufacturer part numbers, the pick-and-place (centroid) file and an assembly drawing. If you need functional testing, add the test specification, firmware and any test fixture requirements so FCT can be planned before production.

Do you support low-volume prototypes as well as mass production?

Yes. The same SMT lines handle engineering prototypes, pilot runs and volume production. Small batches carry a higher unit cost because stencil, line setup and component reel minimums are spread across fewer boards; our engineers advise on panelization and alternate parts to reduce that cost.

How do you control PCBA quality?

Quality is controlled in a closed loop: incoming material inspection, 3D SPI after solder paste printing, AOI after reflow, X-ray inspection for BGA and hidden joints, and functional testing before packing. Workmanship follows IPC-A-610 Class 2 by default, with Class 3 available on request, and the process targets a first-pass yield of 98.5% or higher.

Can you source the electronic components for us?

Yes. We offer full turnkey service where we procure all components through long-term supply partners, partial turnkey where you consign critical parts, and consignment assembly where you supply all materials.

Can overseas buyers audit the factory before ordering?

Yes. Buyers can schedule an on-site audit at our Shenzhen facility or a live video audit covering material storage, SMT lines, inspection stations and traceability records.

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Executive Regulatory Brief

The Global Landscape of RoHS Annex III & IV Exemptions

While commercial consumer electronics have largely achieved complete lead-free conversion, high-reliability applications in automotive, healthcare, and industrial automation continually rely on legal European Union RoHS exemptions (Directive 2011/65/EU and delegated directives). Navigating the renewal cycles, expiration roadmaps, and technical dossiers is vital for tier-1 supply chains.

Annex III Exemption 7(a)

Lead in high melting temperature type solders (i.e. lead-based alloys containing 85% by weight or more lead). Critical for internal die attachment, high-power discrete semiconductors, and power modules operating in severe thermal conditions.

Critical for Automotive Power & Inverters

Annex III Exemption 7(c)-I

Electrical and electronic components containing lead in glass or ceramics other than dielectric ceramic in capacitors (e.g. piezoelectronic devices) or in a glass or ceramic matrix compound. Found in high-voltage thick-film chip resistors.

Found in 90%+ Industrial Control Boards

Annex III Exemption 6(c)

Copper alloy containing up to 4% lead by weight. Predominantly utilized in precision machined brass standoffs, threaded inserts, RF microwave connectors, and heavy-duty terminal blocks mounted on high-reliability assemblies.

Essential for Mechanical Connectors & Hardware

Deep Compliance Matrix

Primary RoHS Exemptions Supported in PCBA Manufacturing

Shenzhen Aozite Technology actively tracks exemption renewal dossiers submitted to the European Commission. We maintain detailed BOM scrubbing, material declaration certificates (IPC-1752A), and Full Material Declarations (FMD).

Exemption Clause	Technical Scope & Material Description	Common Board-Level Components	Status / Regulatory Horizon	Aozite Verification Process
6(a) / 6(a)-I	Lead as an alloying element in steel for machining purposes (<0.35% lead by weight).	Galvanized hardware, chassis fasteners, threaded inserts.	Renewed under review	ICP-OES / XRF elemental scan upon incoming warehouse lot validation.
6(b) / 6(b)-II	Lead as an alloying element in aluminum containing up to 0.4% lead by weight.	Extruded aluminum heatsinks, shield cans, structural brackets.	Active category monitoring	Supplier declaration audit & Mill Test Certificate (MTC) cross-checking.
6(c)	Copper alloys containing up to 4% lead by weight.	D-Sub connectors, SMA coaxial plugs, spring contacts, terminal pins.	Review pending final vote	Spectrometric chemical assay & IPC-1752 Class C/D data intake.
7(a)	Lead in high melting temperature type solders (≥85% Pb).	Power MOSFET dies, BGA ball interior arrays, internal module interconnections.	Valid for Industrial/Cat 9	Thermal profile validation (J-STD-001) preventing unintended reflow leaching.
7(c)-I	Electrical & electronic components containing lead in glass or ceramic.	Thick film SMD chip resistors (0402 to 2512), piezo sensors, passives.	Core exemption in review	BOM scrubbing with automated alerts for parts transitioning to halogen-free/green.
7(c)-II	Lead in dielectric ceramic in capacitors for rated voltage ≥125V AC or ≥250V DC.	High-voltage multi-layer ceramic capacitors (MLCC), snubbers.	Active	Voltage rating validation against customer schematics and stress profiles.

China Factory Efficiency

Shenzhen Precision: Speed, Ecosystem, and Rigorous Compliance

Manufacturing in Shenzhen does not merely provide cost benefits; it delivers unprecedented agile orchestration. Located within 2 hours of the world's highest concentration of original passive vendors, specialty metal turners, and accredited testing laboratories.

Rapid Exemption Verification

Instant access to third-party ISO 17025 accredited labs (SGS, TUV, CTI) in Shenzhen for fast-turn full scan RoHS verification reports in under 48 hours.

Supply Chain Traceability

Dual-source capability for every component with exemption tracking. Direct distributor relationships with Arrow, DigiKey, Mouser, and franchised Asian agents.

Automated SPI + AOI + AXI

Closed-loop inspection across 8 high-speed SMT lines ensuring high-lead internal die solders are not compromised by incompatible reflow thermal curves.

Zero Cross-Contamination

Strict physical segregation between standard lead-free production lines (SAC305) and specialized defense/legacy lines requiring Exemption 7(b) or Annex IV.

8 SMT

High-Precision Production Lines

1.2M+

Placements Daily Capacity

98.5%

First Pass Yield Benchmark

100+

Countries Fully Served

Field Applications

Mission-Critical Sectors Demanding RoHS Exemption Management

RoHS compliance is rarely binary. When engineering for extreme operating environments, understanding where exemptions legally apply prevents costly premature redesigns.

Automotive Power & Inverters

Traction inverters, battery management systems (BMS), and onboard chargers (OBC) endure extreme thermal shock (-40°C to +150°C). Exemption 7(a) high-Pb die attaches guarantee power cycling endurance without micro-void failures.

Applications: EV Powertrain, ADAS Gateways

Medical Diagnostics & Monitoring

Governed under RoHS Category 8 (Medical Devices) and Annex IV exemptions. Critical imaging systems (CT, MRI detectors) and surgical lasers rely on specific lead alloys for radiation shielding and sensor linearity.

Applications: In-Vitro Diagnostics, Patient Monitors

Industrial Automation & PLCs

24/7 continuous operation inside factory environments with heavy vibrational resonance. Thick-film chip resistors utilizing Exemption 7(c)-I prevent sulfurization and impedance drift across multi-decade service life.

Applications: Servo Drives, CNC Controls, SCADA RTUs

Industry Trends & Global Procurement

Strategic Procurement Challenges for International Hardware Brands

International electronics brands from North America, Europe, and Asia-Pacific face tightening environmental reporting standards. RoHS compliance no longer stands alone—it converges with REACH SVHC, TSCA, and PFAS restrictions.

Convergence with REACH & SCIP

Any article containing an SVHC above 0.1% w/w (which includes lead claimed under RoHS exemptions) must be submitted to the ECHA SCIP database. Aozite generates dossiers formatted for immediate client upload.

Turnkey ECHA Documentation Ready

Proactive Component Scrubbing

Global procurement requires predictive supply chain monitoring. When the EU Pack 22 recommendations suggest phase-outs for certain sub-clauses, our engineering team flags affected MPNs up to 18 months before sunset.

Life-Cycle & Obsolescence Forecasting

Full CE Technical File Support

Under EN IEC 63000:2018, manufacturers must assemble comprehensive technical documentation. We supply individual manufacturer declarations, analytical testing records, and assembly certificates of conformity.

EN IEC 63000 Standard Harmonization

Procurement & Engineering Intelligence

Frequently Asked Questions: RoHS Exemptions in PCBA

Direct technical clarification on regulatory liability, factory assembly protocols, testing frameworks, and international export procedures.

What is the difference between RoHS Compliant and RoHS Compliant with Exemption?

"RoHS Compliant" implies every homogeneous material within the electronic product strictly contains restricted substances below the statutory thresholds (e.g., <1000 ppm for lead, mercury, hexavalent chromium, PBB, PBDE, and four phthalates; <100 ppm for cadmium). "RoHS Compliant with Exemption" indicates that while one or more homogeneous materials exceed the statutory limit (e.g., lead in a high-temperature solder joint exceeding 850,000 ppm), the usage is legally protected by a formal EU Annex III or Annex IV exemption because technically viable, lead-free substitutes do not yet exist.

How does Shenzhen Aozite manage BOM scrubbing for RoHS exemptions?

During the initial Design for Manufacturing (DFM) and quotation phase, our component engineering team audits your complete Bill of Materials against current ECHA and EU Commission exemption schedules. Every component is cross-referenced using manufacturer part numbers (MPNs) against active chemical databases. If an MPN claims Exemption 7(c)-I or 6(c), we verify the manufacturer's active declaration (IPC-1752A or material declaration sheet) and ensure the exemption validity matches your market launch timeline.

Does having components with RoHS exemptions prevent my device from bearing the CE Mark?

No. Products that legitimately utilize active Annex III or Annex IV exemptions remain fully compliant with the RoHS Directive 2011/65/EU and are fully authorized to bear the CE mark (and UKCA mark in the United Kingdom). However, you must compile a technical file satisfying harmonized standard EN IEC 63000:2018 citing the exact exemption codes utilized. Shenzhen Aozite provides all corresponding supplier declarations and assembly records to complete your technical file.

What occurs when an EU RoHS exemption reaches its statutory expiration date?

When an industry application for exemption renewal is submitted at least 18 months prior to expiration, the existing exemption legally remains in force until the European Commission reaches an official decision. Once a decision is adopted, if the exemption is renewed, new validity dates and potential sub-category scopes are published. If an exemption is revoked or allowed to sunset, the EU grants a transition period of 12 to 18 months. Our engineering team continuously provides early warning reports to clients to facilitate redesigns or alternative part qualifications well before transition windows elapse.

Can our engineering team commission third-party chemical testing on assembled boards?

Yes. In addition to our inline automated optical inspection (AOI), 3D solder paste inspection (SPI), and X-ray testing (AXI), we routinely coordinate accredited chemical laboratory testing (XRF screening and ICP-OES wet chemistry analysis) via internationally accredited partners (SGS, TUV, Bureau Veritas, CTI) in Shenzhen. Test reports by homogeneous material level are delivered with certificate traceability.

Complete SMT & PCBA Manufacturing Catalog