Best Mixed Technology Assembly Service & Factories: Engineering Authority

To provide an accurate, itemized quotation and comprehensive Design for Manufacturability (DFM) analysis, we require: (1) Gerber RS-274X or ODB++ files including all copper layers, solder masks, silkscreens, and drill layers; (2) A complete Bill of Materials (BOM) in Excel format containing part reference designators, manufacturer names, exact Manufacturer Part Numbers (MPN), descriptions, and package footprints; (3) Pick-and-Place (Centroid / XY coordinates) file for all surface mount parts; (4) Detailed Assembly Drawings indicating manual DIP insertion requirements, polarities, lead protrusion limits, and mechanical hardware; and (5) Functional Circuit Test (FCT) guidelines, wiring diagrams, and test firmware if turnkey testing is required.

Boards with both fine-pitch BGAs/0201s and heavy through-hole connectors present significant thermal mass differences. If processed simultaneously through traditional reflow, small ICs risk overheating before large metal ground planes reach solder melt temperature. We resolve this through multi-tiered approaches: (1) Selective Wave Soldering: SMT components are placed and reflowed first using a tailored SMT profile; DIP parts are subsequently soldered from the bottom side using programmable mini-nozzles with custom pallet shielding to protect adjacent SMT parts. (2) Pin-in-Paste (PIP) with Stepped Stencils: If geometry permits, we apply thicker solder paste volume to through-hole barrels using specialized step-up stencils, tuning reflow soak times across 10-zone Heller ovens to equilibrate thermal inertia across disparate component masses.

PTH solder joints are inspected strictly in accordance with IPC-A-610 Class 2 or Class 3 mandates. Class 3 inspection demands that the vertical fill of the plated barrel reaches at least 75% coverage, with a 360-degree top and bottom fillet wetting angle. Because optical inspection (AOI) cannot verify internal barrel solder volume beneath component bodies, our manufacturing lines employ high-resolution 3D Automated X-ray Inspection (AXI) to non-destructively quantify barrel fill depth, identify solder voids, and eliminate blow-holes or internal pin disconnects.

We enforce a strict procurement charter: all silicon ICs, MOSFETs, and active passives are procured directly from franchised original component manufacturers (OCMs) or authorized global distributors (Arrow, Avnet, DigiKey, Mouser, Future Electronics). When obsolete or hard-to-source parts require spot market procurement, materials pass through our internal IQC lab where they undergo decapsulation die verification under high-magnification microscopy, XRF spectrographic lead-content analysis, acetone blacktop testing, pin scan continuity verification, and LCR bridge tolerance calibration.

Yes. We regularly host live digital video audits with international engineering and sourcing directors. These sessions cover our incoming material ESD storage bays, nitrogen baking cabinets, high-speed SMT placement lines, 3D SPI setups, reflow thermal logging, wave/selective soldering cells, AOI/AXI inspection stations, and our dedicated testing lines. Furthermore, customers are provided with complete documentation packages including ISO certificates, calibration records, and full First Article Inspection (FAI) reports with every prototype and pilot run.