How to Find the Right PCB Assembly Factory in China: A Complete Guide

April 5, 2026

Searching for a PCB assembly factory in China can feel overwhelming. Thousands of factories in Shenzhen alone. Each one claiming to be "the best." Prices ranging wildly. And you're thousands of miles away.

After touring multiple facilities in the Pearl River Delta (PRD) – the world's electronics manufacturing heartland – I've put together this practical guide to help you navigate the process.

Here is what we will cover:

What files you need to get an accurate quote
What fabrication processes a capable factory should offer
How to identify which factory is right for you

Let's dive in.

Part 1: What Files Do You Need for PCB Assembly?

Before any factory can quote or assemble your boards, you must provide a complete documentation package. Incomplete or incorrect files are the #1 cause of delays, incorrect quotes, and assembly errors.

Here is the standard checklist:

Required Files (Every Project Needs These)

File Type	Format	What It Contains	Why It's Needed
Gerber Files	.zip (RS-274X)	PCB layer data: copper traces, solder mask, silkscreen, pad locations	Fabrication of the bare PCB
BOM (Bill of Materials)	Excel/CSV	Component list: part number, value, package, quantity, reference designator	Sourcing components and assembly planning
Pick & Place (Centroid) File	.txt or .csv	X/Y coordinates and rotation for every component	Tells SMT machines exactly where to place each part
PCB Specification	Text/PDF	Layer count, dimensions, quantity, thickness, pad finish (HASL/ENIG/OSP), color	Defines how the PCB should be manufactured

Recommended Files (Avoid Mistakes)

File Type	Format	Purpose
Assembly Drawing	PDF	Shows component orientation, polarity marks, special assembly notes
Schematic	PDF	Circuit diagram – used for functional test development and debugging
Testing Plan	PDF	Functional test steps, expected voltages/signals, pass/fail criteria

How to Generate Gerber Files

Gerber files are the industry standard for PCB fabrication. They tell the factory exactly how to manufacture your bare circuit board. Here is how to export them from common EDA software:

Software	Export Function	Notes
Altium	File → Fabrication Outputs → Gerber Files	Select all layers (Copper, Solder Mask, Silkscreen, Drill). Use RS-274X format
KiCad	File → Plot → Generate Gerber Files	Check "Use Protel filename extensions". Also generate drill files (.drl)
Eagle	File → CAM Processor → Load job file → Process Job	Use "gerb274x.cam" job file for standard Gerber output
EasyEDA	Fabrication Output → Gerber	One-click generation. Download as .zip file
OrCAD	Manufacture → Artwork → Create Artwork	Set format to RS-274X. Generate all layer films
DipTrace	File → Export → Gerber	Select all necessary layers. Include drill file

What a Gerber package should include:

Copper layers (Top, Bottom, Inner 1, Inner 2, etc.)

Solder mask layers (Top, Bottom)

Silkscreen layers (Top, Bottom)

Paste mask layers (Top, Bottom) – for stencil fabrication

Drill file (Excellon format)

Readme file (layer stackup, dimensions, special instructions)

How to Generate a BOM (Bill of Materials)

The BOM is a complete list of components needed to assemble your board. Accurate BOMs prevent sourcing errors and assembly delays.

Software	Export Function	Notes
Altium	Reports → Bill of Materials	Export as Excel (.xlsx) or CSV. Use built-in templates
KiCad	File → Fabrication Outputs → BOM	Export as .csv or .html. Use plugins for advanced formatting
Eagle	Run ULP → bom.ulp	Exports as .txt or .csv. Can group identical components
EasyEDA	Fabrication Output → BOM	One-click export. Includes manufacturer part numbers if available
OrCAD	Tools → Bill of Materials	Export as .txt, .csv, or .xls
CircuitStudio	Reports → Bill of Materials	Export to Excel. Customizable columns

What a good BOM should include (minimum):

Column	Example	Why It's Needed
Reference Designator	R1, R2, C3, U1	Tells factory where to place each component
Part Number (MPN)	CRCW040210K0FKED	Manufacturer part number – ensures correct component
Value / Specification	10kΩ, 1%, 0402	Electrical and physical specifications
Package / Footprint	0402, SOP-8, QFN-32	Physical size and pad layout
Quantity	100	Total number needed for your order
Description	Resistor, chip	Quick identification

How to Generate a Pick & Place (Centroid) File

The Pick & Place file tells SMT machines exactly where to put each component on the board.

Software	Export Function	Notes
Altium	File → Assembly Outputs → Generates Pick and Place	Exports as .txt or .csv. Includes X/Y coordinates and rotation
KiCad	File → Fabrication Outputs → Footprint Position (.pos)	Select "Single file for board" and millimeters for units
Eagle	ULP → run mountsmd.ulp	Generates .txt file with component positions
EasyEDA	Fabrication Output → Pick and Place File	One-click download. Coordinates in mm or inches
OrCAD	Auto → Reports → Place Component Report	Export as .txt or .csv
DipTrace	File → Export → Pick and Place	Select units (mm recommended) and rotation format

What a Pick & Place file should include:

Column	Example	Purpose
Reference	R1	Identifies the component
Layer	Top / Bottom	Which side of the board
X Coordinate	10.50	Horizontal position in mm
Y Coordinate	25.30	Vertical position in mm
Rotation	0°, 90°, 180°, 270°	Component orientation
Package	0402	Footprint size (optional but helpful)

Quick Reference: Files Needed for PCBA

Here is a summary of all files you should prepare before contacting a factory:

File	Required?	Format	Generated By
Gerber files	✅ Yes	.zip (RS-274X)	PCB design software
Drill file	✅ Yes	.drl, Excellon	PCB design software (often included in Gerber .zip)
BOM	✅ Yes	.xlsx, .csv	PCB design software or manual entry
Pick & Place file	✅ Yes	.txt, .csv	PCB design software
PCB specification	✅ Yes	PDF, text	Manual – write down layer count, thickness, color, finish
Assembly drawing	Recommended	PDF	PCB design software + manual annotations
Schematic	Recommended	PDF	PCB design software
Testing plan	For functional test	PDF	Manual – describe test steps and pass/fail criteria

Pro tip: Always zip all files together and label the folder with your project name, date, and revision number (e.g., ProjectX_PCBA_v2.1_20250405.zip).

Part 2: What Fabrication & Assembly Processes Should a Factory Offer?

Not all factories are created equal. A capable PCBA factory should offer the following processes. Use this as your checklist when evaluating suppliers.

PCB Types They Should Support

PCB Type	Typical Applications	Why It Matters
FR4 Rigid Board	Standard electronics – consumer, IoT, industrial	The baseline – every factory should support this
Aluminum Board	LED lighting, power electronics	High-thermal applications
Flexible Board (FPC)	Wearables, cameras, medical devices	Growing demand for compact, bendable designs
Rigid-Flex Board	Aerospace, medical implants, high-reliability	Complex products that need both rigid and flexible sections

SMT Assembly Capabilities

Package Type	What It Means	Minimum Capability
Standard passives	0805, 0603, 0402	All factories should handle these
Small passives	0201 (0.6mm x 0.3mm)	Good factories support this. Essential for compact designs
IC packages	SOIC, QFP, QFN, PLCC	Standard – should be supported
Advanced packages	BGA, PoP (Package-on-Package)	Required for smartphones, advanced processors, memory chips

Through-Hole & Assembly Capabilities

Process	Description	When You Need It
Through-Hole Assembly	Components with leads inserted into holes	Connectors, large capacitors, transformers, relays
Wave Soldering	Simultaneous soldering of all thru-hole components	High-volume thru-hole production
Hand Soldering	Manual soldering for rework or small batches	Prototypes, touch-up, odd-shaped components
Sub-Assembly	Partial assembly – e.g., PCBA mounted into enclosure	When you need more than just a bare board
Box Build Assembly	Complete product assembly including casing, wiring, labeling	Full product manufacturing

Soldering Standards

Standard	What It Means
Lead-Free / RoHS Compliant	Mandatory for products sold in EU, US, many other markets
IPC-A-610	International standard for PCB assembly acceptability – look for Class 2 (general electronics) or Class 3 (high-reliability for medical/aerospace)

Quality Control & Testing Processes

A professional factory should offer a multi-stage QC process:

Stage	Process	What It Detects
Incoming	IQC (Incoming Quality Control)	Damaged or counterfeit components, PCB defects
SMT Line	SPI (Solder Paste Inspection)	Incorrect paste volume, alignment issues
SMT Line	Pre-reflow AOI	Missing components, polarity errors
SMT Line	Post-reflow AOI	Solder bridges, insufficient solder, tombstoning
SMT Line	X-Ray Inspection (for BGA/QFN)	Hidden voids or shorts under components
Post-Assembly	ICT (In-Circuit Test)	Shorts, opens, incorrect component values
Post-Assembly	Functional Test	Board works as designed – powered up and tested
Outgoing	OQC (Outgoing Quality Control)	Final visual and packing check

Optional Value-Added Services

These services separate good factories from great ones:

Service	Why It Matters
Turn-Key Component Sourcing	Factory procures all parts – one invoice, one point of contact
Design for Manufacturing (DFM) Review	Catches design errors before production – saves time and money
Conformal Coating	Protects boards from moisture, dust, chemicals
Flying Probe Test	Fixtureless testing – ideal for prototypes and small batches
Drop Shipping	Factory ships directly to your end customers

Certifications to Look For

Certification	Industry	Why It Matters
ISO9001:2015	All industries	Basic quality management system – ensures consistent processes
IATF16949:2016	Automotive	Strictest quality standard – required for car electronics
ISO13485	Medical devices	Quality management for medical products – rigorous traceability
UL / CE / FCC	Various	Product safety and compliance – factory should have experience with these certifications

Part 3: Which Factory Is the Right One for You?

Now that you know what files to prepare and what processes to look for, here is how to match your specific needs to the right type of factory.

Step 1: Understand Your Own Requirements

Ask yourself these questions before contacting any factory:

Question	Your Answer	Implication
What is your order quantity?	1–100 units	Look for prototype-friendly factories. Avoid high-volume-only factories
	100–1,000 units	Look for small-batch specialists
	1,000–10,000 units	Most mid-sized factories can handle this
	10,000+ units	Look for high-volume factories with multiple SMT lines
What is your PCB technology?	FR4, simple design	Most factories qualify
	Flex, rigid-flex, HDI	Need a factory with advanced capabilities
What components are you using?	0402, 0201, BGA, PoP	Need a factory with advanced SMT equipment
	Through-hole connectors	Need a factory with wave soldering capability
What certifications do you need?	ISO9001 only	Most certified factories qualify
	IATF16949 (automotive)	Need automotive-certified factory
	ISO13485 (medical)	Need medical-certified factory
Who provides components?	You supply all parts	Look for factories with no handling fee for customer-supplied parts
	Factory supplies all parts	Need a factory with strong turn-key sourcing capabilities
Do you need testing?	Just visual inspection	Basic QC is sufficient
	Functional testing, ICT, X-Ray	Need a factory with advanced testing equipment

Step 2: Match Your Needs to Factory Types

Here is a simple decision matrix:

Your Profile	Recommended Factory Type	What to Look For
Hardware startup / Maker (1–100 units, simple FR4, tight budget)	Prototype-focused small factory	Low MOQ (1–5 pcs), accepts customer-supplied parts, quick turnaround, no handling fee
SMB / Growing brand (100–5,000 units, mixed components)	Mid-sized factory with flexible lines	Dedicated project manager, turn-key option, functional testing, ISO9001
Medical device company (Low volume, high reliability)	ISO13485 certified factory	Class 3 IPC-A-610, full traceability, X-Ray, burn-in testing, documentation package
Automotive supplier (Medium to high volume)	IATF16949 certified factory	PPAP documentation, strict process control, 100% testing
High-volume consumer electronics (50,000+ units, cost-sensitive)	Large factory with multiple SMT lines	Economies of scale, automated testing, wave soldering for thru-hole

Step 3: Red Flags to Watch Out For

During your factory evaluation, watch for these warning signs:

Red Flag	Why It's a Problem
"We can do everything" without asking for your files	No factory is good at everything. They should ask questions about your specific needs
No clear quality control process	If they can't explain their QC steps, they probably don't have them
No certifications displayed or offered	ISO9001 is basic. If they don't have it, walk away
Vague pricing	You should get a line-item quote: PCB + stencil + components + assembly + testing
No dedicated project manager	You will waste time chasing different people for updates
Push back on small orders	If they say "minimum 10,000 units" and you need 100, find another factory

Step 4: The Reality of Remote Sourcing

Here is the honest truth:

You cannot verify a factory's quality from your desk.

Photos on websites can be outdated. Samples can be perfect while mass production cuts corners. Claims of "ISO certification" might be fake.

Even after you match all the criteria above, you still need someone on the ground to:

Conduct an in-person factory audit before you commit
Perform in-process inspections during your production run
Verify pre-shipment quality before your boards leave China

How We Help: Your Local Partner in Shenzhen

You don't need to fly to China to get factory-floor visibility. We are based in Shenzhen, and we act as your local eyes and ears.

What We Do

Service	What You Get
Factory Sourcing	We match your requirements (quantity, PCB type, components, certifications, budget) to 3–5 qualified factories from our vetted network of 500+ suppliers
Factory Audit	On-site evaluation within 24–48 hours – we verify equipment, ESD controls, certifications, staff competency, and take photo/video evidence
Production Follow-Up	We monitor first article inspection, check component placement, verify BOM compliance, and send real-time updates via WhatsApp/WeChat
Pre-Shipment Inspection	AQL Level II sampling per ANSI/ASQ Z1.4, IPC-A-610 Class 2 or 3 visual check, functional test verification, packing check
Full Transparency	Detailed report with photos and videos. Live video call during any inspection – you watch from your office

What We Cover

We serve the entire Pearl River Delta electronics manufacturing region:

City	Response Time
Shenzhen	Same-day
Dongguan	Same-day
Huizhou	Same-day
Guangzhou	24–48 hours
Foshan	24–48 hours
Zhuhai	24–48 hours
Zhongshan	24–48 hours
Jiangmen	24–48 hours

Our Commitment

No hidden fees – transparent per-service or percentage-based pricing
Electronics specialists – we understand PCBA, components, assembly, and certifications like CE, FCC, RoHS
One point of contact – we coordinate with suppliers so you don't have to
English and Chinese support – no language barriers

Summary: Your Action Plan

Here is a quick checklist to guide your next steps:

Step	Action
1	Prepare your files – Gerbers, BOM, pick & place, PCB spec, testing plan (if available)
2	Define your requirements – quantity, PCB type, components, certifications, budget
3	Identify your factory type – prototype, SMB, medical, automotive, or high-volume
4	Contact us for factory matching – we will find 3–5 qualified suppliers from our vetted network
5	Review audit reports – we visit the factories and send you photo/video evidence
6	Approve production – we monitor quality throughout the process
7	Receive your boards – with confidence, knowing we verified quality on the ground