OEM Circuit Card Assy Suppliers & Turnkey Manufacturing

IPC-A-610 classifies assemblies based on operating criticality: Class 2 governs "Dedicated Service Electronic Products" (telecommunications, commercial equipment, high-end consumer hardware) where continuous performance is desired, and standard operating life is expected without catastrophic failure. Class 3 covers "High Performance / Harsh Environment Electronic Products" (aerospace avionics, military defense systems, medical life-support instrumentation) where equipment downtime cannot be tolerated, environmental operational limits are severe, and life-critical reliability is required.

In practical assembly terms, Class 3 demands far tighter process windows: 75% minimum barrel fill for through-hole leads (versus 50% in Class 2), tighter BGA alignment and void limits (frequently below 15% cumulative void area per ball), strict lead overhang and heel fillet criteria, and complete documentation of all thermal reflow profiles and chemical wash cleanliness tests (ROSE test results under 1.56 μg/cm² NaCl equivalent).

Our quality verification starts before kitting through our Incoming Quality Control (IQC) protocol. All active silicon and passive lots are sourced directly through authorized original component manufacturers (OCM) or Tier-1 franchised distributors (including Arrow, Avnet, DigiKey, Mouser, and verified regional direct factory relationships). For obsolete or emergency spot-market requirements requested by customers, incoming parts pass through a 4-tier screening system: (1) High-magnification optical microscopy and marking remarking inspection; (2) Lead frame XRF elemental analysis for lead-free/RoHS metallurgy verification; (3) Decapsulation and internal die verification against manufacturer silicon libraries; and (4) Solderability testing under IPC/EIA/JEDEC J-STD-002.

Mixed-technology assemblies introduce significant thermal mass disparities (ΔT) across the board surface. If untreated, small passives will overheat and experience tombstoning or de-wetting, while massive transformers or ground-plane inductors fail to achieve liquidus temperature, resulting in cold joints.

We deploy 10-zone reflow convection ovens running high-purity nitrogen blankets (<500 ppm O2). Before production release, our process engineers profile the actual physical board using a calibrated KIC thermal datalogger with micro-thermocouples embedded in both the lowest-mass 0201 component body and the center termination of the largest magnetic component. We tune the soak zone to achieve equilibrium across all component packages, keeping ΔT under 7°C across the entire CCA immediately prior to the peak liquidus reflow stage (typically 235°C–245°C for SAC305).

Yes. Approximately 45% of our overseas OEM projects transition from circuit card assembly into full electromechanical box-build. Our Shenzhen facilities support aluminum CNC milling, rapid 3D tooling, precision plastic injection molding, silicone gasket dispensing, wire harness crimping, customized potting, and thermal interface material (TIM) placement. Following mechanical casing closure, we perform complete finished-unit burn-in, custom firmware flashing, label laser marking with unique QR-code serialization, and packaging for direct drop-ship distribution.

To produce an exhaustive engineering quote and automated DFM analysis, our engineering team requires: (1) Bare board Gerber RS-274X or ODB++ fabrication data; (2) Bill of Materials (BOM) in Excel or CSV format including exact Manufacturer Part Numbers (MPN), quantities per reference designator, approved secondary alternatives, and component package styles; (3) Centroid / Pick-and-Place (X-Y coordinate) file; and (4) Assembly drawings indicating polarity markers, mechanical keep-outs, torque specifications, and conformal coating boundaries. If functional testing (FCT) is required, an accompanying test procedure document and flashing firmware must be provided.