FAQ

Over our 10+ years of development experience, these are the most frequently asked questions

To help you better understand common challenges in PCBA solution development and customization, HUASUN has compiled the most frequently occurring issues across key stages of our core business—including pre-cooperation communication, design and prototyping, mass production, component procurement, and delivery and after-sales service. This reference aims to streamline our collaboration and ensure a smoother partnership.

1、About PCBA Solution

1、 What is the lead time for PCBA solution development?

A: It depends on the complexity of the project. For standard consumer electronics solutions—like small appliance controls, 3C products, or basic IoT modules—the development cycle is 15 to 30 days. For high-precision, complex projects such as industrial-grade equipment, automotive electronics, or AI devices, which require multiple rounds of debugging and certification, the timeline extends to 30 to 60 days. Since every project is unique, we will provide a precise development schedule based on your specific requirements when we give you a quote.

2、Can your PCBA solution development fully satisfy our functional requirements?

A: Development timelines vary by solution complexity:
• Standard consumer electronics (small appliances, 3C products, simple IoT modules): 15-30 days
• High-precision complex solutions (industrial, automotive electronics, AI devices): 30-60 days (requires multiple debugging and certification rounds).
We provide a customized timeline based on your specific requirements during the quoting process.

3、Does the solution development cover subsequent upgrades and enhancements?

A: Yes. We provide free basic iteration services for 3-6 months post-delivery, including minor function adjustments and compatibility optimizations.

For major upgrade iterations involving core function redevelopment, hardware architecture adjustments, or similar significant changes, we will issue a reasonable supplementary quote based on the complexity of your requirements, with clear cooperation details confirmed in advance.

2、About Design and Sample

1、 How long does the PCB/PCBA prototyping process take?

1、Single/Double-sided PCBs: 5-7 working days(24-hour turnaround available for quick-turn prototyping)
2、Multilayer PCBs (4-8 layers): 7-10 working days(Approx. 1 week for expedited prototyping)
3、PCBA Assembly: Additional 3-5 days(Lead time subject to component procurement schedule)

2、What factors affect the cost of PCB/PCBA prototyping?

1、Base Costs: Board size, number of layers (Cost increases by 20-50% for every additional 2 layers), substrate material type
2、Process Costs: Surface finish (HASL is the most cost-effective; ENIG typically costs $10-30), special hole structures (microvias/blind & buried vias), copper thickness
3、Process Costs: Surface finish(HASL is the most cost-effective; ENIG typically costs $10-30), special hole structures (microvias/blind & buried vias), copper thickness

3、What files do I need to provide for PCB/PCBA prototyping?

Turnkey Solution Development + PCBA Integration Service

Simply provide your product functional requirements, and we will handle all other design documentation.

For Existing Designs Requiring Board Cloning or Partial Function Modifications

Please provide the following documents:

Schematic (SCH) files
PCB Layout files (e.g., Altium, PADS formats)
Bill of Materials (BOM) with component models, specifications, and manufacturers clearly indicated
Gerber files (for PCB fabrication)

For Existing PCB Prototyping

PCB Design Requirements

Gerber files (mandatory)
Drill files
Design specifications

PCBA Assembly Requirements

All the above PCB design files
Bill of Materials (BOM) including component models, packages, and quantities
CPL (Component Placement List) files

Testing Requirements

Test specification document (if functional testing is required)

4、How can I ensure my design is manufacturable?

Our engineers will conduct a complimentary DFM (Design for Manufacturability) analysis, focusing on verifying pad spacing, appropriateness of hole sizes, routing compliance, component layout compatibility, and other critical factors.
This proactive review prevents low production yield and increased costs caused by design flaws. If any issues are identified, we will issue a detailed optimization proposal and proceed with production only after customer confirmation.

5、Prototype samples are tested? What is tested?

All prototype samples will undergo all completed tests, including:
Electrical performance tests: Continuity tests, stable voltage and current measurements, power consumption tests
Functionality tests: Basic function realisation tests, Interface fit testing
Basic Environmental tests: Temperature stability tests at room temperature and basic anti-interference tests
Where all tests are successfully completed a full report will be issued with the samples.

3、About Manufacturing & Quality Control

1、What is the yield rate of mass production PCBA, and how is it guaranteed?

For general products, the yield rate is ≥99.5%; for high-end products including industrial electronics and automotive electronics, the yield reaches ≥99.8%.
This is guaranteed by:
100% Raw Material Inspection of component model, specification and quality to eliminate inferior materials
Full-process production control and test based on IPC standard and automating the soldering or inspection processes
100% Finished product inspection including AOI, electrical test and functional sampling test

2、 Is it possible for cold solder joints or false soldering problems to occur during the production process?

The CDM employs a fully automated reflow oven and wave soldering machines made by reputable manufacturers (Fuji, Orbotech) with accurate temperature profiling to help maintain a consistent soldering environment at the machines.
All units are inspected twice after soldering:
AOI Inspection: for identifying visible surface defects
XRay Inspection: to determine the internal soldering quality of BGAs, through-hole connections, and several other components.
This meticulous inspection process reduces the number of soldering defects, including cold solder joints and false solder joints, to an extremely low number, less than 0.1% of the total number of soldered parts in a typical production run.

3、What is your production capacity?

We have 5 full automatic SMT production line with:
Daily capacity: 50,000-80,000 PCBA units
Monthly capacity: 1.5-2.4 million units
We flexibly manage our production lines to run in parallel:
For standard bulk orders of 10,000-100,000 units, we can maintain a lead time of 7-15 days.
For orders of larger volumes (100,000+ units) we can expedite production.

4、About Delivery and After-sales Service

1、 What prevention measures are taken when shipping a PCB or PCBA?

To help ensure a PCB or PCBA is shipped without damage, Multi Layered Protection has been established. Protecting PCB/PCBA against Electrostatic Discharge (ESD): Anti-static bags with humidity indicator cards have been used to package all PCBs/PCBAs that include an ESD warning label on the outside of the parcel, preventing the risk of damage from electrostatic discharge.
Protecting PCB/PCBA from Shocks and Vibrations: High density foam and corrugated cardboard have been used to cushion PCBs/PCBAs from shocks and vibrations during transit, preventing the detachment of components and the cracking of solder joints.
Protecting PCB/PCBA from Moisture: For PCBs/PCBAs with sensitive components, vacuum sealed with desiccant is used according to the IPC/JEDEC J-STD-033 moisture protection standard. Compliance Certifications: Packaging processes have been in accordance with international compliance standards including IPC-A-610 and ISO 9001 to ensure the PCBs/PCBAs arrive in perfect condition.

2、 What is covered by the warranty when it comes to after sales support?

Warranty Coverage: A 12 month warranty is provided for standard Production PCB/PCBAs that cover manufacturing defects such as solder joints, failure of components and functionality of PCB/PCBAs. Items classified as “consumable” and damaged due to user error are not covered by the warranty.

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