China PCB Assembly and Soldering Manufacturers & Factories

For quick-turn prototype PCB assembly (1 to 50 pieces), typical lead times range from 3 to 7 working days once components and bare substrates arrive at our facility. If components are consigned or pre-stocked locally in Shenzhen, rapid-turn assembly can be executed within 48 to 72 hours.

For medium-to-high volume turnkey production (1,000 to 50,000+ pieces), total production lead times typically span 3 to 4 weeks, which accommodates incoming material testing (IQC), PCB fabrication, stencil fabrication, surface mounting, automated optical inspection, through-hole wave soldering, and functional chamber testing.

To deliver an exact engineering and procurement quote within 24 hours, our engineering department requires the following standardized packages:

1. Gerber Files / ODB++: RS-274X format including copper layers, solder mask, silkscreen, paste mask layers, and drill tables.
2. Bill of Materials (BOM): Formatted in Excel with clear Reference Designators, Manufacturer Part Numbers (MPN), approved second-source equivalents, component descriptions, package footprint, and quantities per board.
3. Pick-and-Place (Centroid) File: ASCII text or CSV defining component midpoints, rotation angles (0-360°), and board sides (Top/Bottom).
4. Assembly Drawings & Special Work Instructions: Outlining specific potting, conformal coating masks, keep-out areas, and torque specs.

We maintain a stringent zero-tolerance counterfeit prevention policy compliant with AS6081/AS5553 guidelines. All passive and active semiconductors are procured strictly from original component manufacturers (OCM) or tier-one franchised global distributors (DigiKey, Mouser, Arrow, Element14, or authorized local agents for STMicroelectronics, Texas Instruments, Microchip, and NXP).

For critical chips sourced via authorized spot distributors to resolve global allocation shortages, our in-house Incoming Quality Control (IQC) conducts X-Ray package verification, die marking de-capsulation, solderability testing, and XRF RoHS composition analysis before any parts enter SMT kitting feeders.

IPC-A-610 Class 2 (Dedicated Service Electronic Products): Covers consumer electronics, commercial appliances, and communication hardware. It requires high reliability and prolonged life, but uninhibited continuous operation is not absolutely mission-critical. Cosmetic surface imperfections and minor solder fillet variations are acceptable.

IPC-A-610 Class 3 (High Performance / Harsh Operating Environment Electronics): Mandatory for aerospace, medical life support, and automotive safety electronics where equipment downtime cannot be tolerated. Class 3 imposes strict barrel fill thresholds (>75% vertical fill on THT pins), stricter BGA voiding criteria (<15% individual voiding), precise conductor spacing, and uncompromising zero-defect solder fillet wet angles.

Yes. Handling of Moisture-Sensitive Devices (MSD) strictly adheres to the IPC/JEDEC J-STD-033 standard. Components rated MSL 3, 4, 5, or 6 are cataloged upon arrival, stored in nitrogen dry cabinets maintaining <5% relative humidity (RH), and closely tracked by our MES system for floor-life exposure.

If parts exceed allowable environmental exposure windows, they undergo scheduled low-temperature thermal de-humidification baking (typically 125°C for 24-48 hours depending on reel packaging limitations) to eliminate the risk of internal package delamination, micro-cracking, or the "popcorn effect" during reflow oven passes.

Yes. In addition to high-precision SMT and THT soldering, our Shenzhen facilities feature comprehensive box-build and final system integration departments. Our services include custom plastic injection molding, CNC aluminum enclosure fabrication, silicone keypad integration, custom wire harness assembly, laser marking, and labeling.

Our engineering team regularly accepts custom customer-supplied functional test fixtures (Bed of Nails) or builds automated FCT systems locally based on your test specification document. We handle microcontroller bootloader/firmware flashing, RF calibration, high-voltage breakdown dielectric testing, and complete retail-ready final packaging.