Buy Circuit Board Assembly Services Supplier & Company

To prepare a precise, un-bracketed turnkey quote, our engineering team requires: (1) Gerber Files (RS-274X) or ODB++ data specifying board layer stack-ups, drill tables, and copper finishes; (2) A consolidated Bill of Materials (BOM) in Microsoft Excel, clearly noting Manufacturer Part Numbers (MPN), reference designators, package footprints, and authorized second-source alternates; (3) Centroid / Pick-and-Place File (ASCII coordinates format: X, Y, rotation, board side) for SMT automated machine programming; (4) Assembly Drawings indicating mechanical keep-outs, connector orientations, and post-assembly conformal coating boundaries; (5) Test Specifications including functional firmware, pin jigs, and pass/fail parameters if requesting Functional Circuit Testing (FCT).

Our procurement division leverages direct franchise agreements and established Tier-1 relationships (Arrow, Avnet, DigiKey, Mouser, element14) alongside direct factory distribution for brands such as Texas Instruments, Analog Devices, STMicroelectronics, and Murata. When procuring tight-supply silicon from qualified open markets, materials undergo our three-stage IQC protocol: optical package topography and laser-etch microscopic inspection, X-ray leadframe inspection for die bonding uniformity, and pin-to-ground diode mapping against genuine component golden samples.

Our 6 automated SMT lines feature Yamaha high-speed modular mounters capable of placing miniature passives down to 01005 (0402 metric) and 0201 sizes. For integrated circuits, we assemble fine-pitch Quad Flat Packages (QFP) down to 0.3mm lead pitch, Wafer-Level Chip Scale Packages (WLCSP), and Ball Grid Arrays (BGA) down to 0.3mm ball pitch. Every BGA component placement is verified via multi-axis 3D X-Ray inspection to check for solder voiding ratios, bridging, and solder ball non-wetting according to IPC-A-610 Class 2 and Class 3 criteria.

Yes. We offer fully adaptable engagement frameworks: Full Turnkey: We procure bare boards, all passive and active components, stencils, assembly, and test fixtures under one contract. Partial Turnkey / Consignment: Customers consign proprietary programmed ASICs, proprietary sensors, or custom key silicon, while our Shenzhen procurement team kits all standard passives, connectors, transistors, and bare substrates. We audit consigned kits against the BOM prior to production line release.

Beyond Solder Paste Inspection (SPI) and automated optical inspection (AOI), we build dedicated test rigs: In-Circuit Testing (ICT): Checking trace continuity, component values, and open/short integrity using spring probe bed-of-nails beds. Functional Circuit Testing (FCT): Custom test jigs simulating true operational loads, verifying RF output levels, serial communication protocols, and display drivers. Firmware Programming: Flashing flash EEPROM, MCU, and FPGA silicon via JTAG, SWD, or automated gang programmers. Environmental Stress Screening (ESS): Controlled burn-in chambers executing thermal soak cycling under electrical bias to eliminate infant mortality failures before shipment.

For standard prototype runs (1 to 500 boards), typical turnaround is 3 to 9 business days, provided all BOM components are available ex-stock. Quick-turn expedites can produce double-sided SMT boards in 48 hours. For production batches (500 to 100,000+ units), overall production cycle times average 3 to 4 weeks, governed primarily by specific component manufacturer lead-times. We establish vendor-managed inventories (VMI) and buffer stocks of common chips to facilitate continuous delivery schedules.