Where is your PCB factory located?

We operate two production bases in Huizhou (Guangdong) and Ji’an (Jiangxi), with a combined monthly capacity of about 160,000 m²: Huizhou focuses on special materials, COB and comms boards, while Ji’an is a 120,000 m² smart factory for multilayer and HDI. We ship to customers in more than 50 countries and regions.

How many layers can you manufacture?

From single-sided and double-sided boards up to 40 layers in standard volume production, with HDI also to 40 layers, including any-layer interconnect structures with laser-drilled microvias. IC substrates run to 64 layers.

What is your quick-turn lead time for prototypes?

Quick-turn prototypes can ship in as fast as 24 hours. Standard multilayer production runs 3 to 15 working days depending on layer count and finish.

Do you provide value-added assembly services?

Yes. When required, PCBA is available as an optional value-added service, including component sourcing, SMT and through-hole assembly. Our core business and primary focus remain PCB fabrication.

Which certifications does your factory hold?

We are certified to ISO 9001, ISO 14001 and IATF 16949, with UL, RoHS and REACH compliance for the relevant product lines.

Can you build high-frequency and heavy copper boards?

Yes. We process Rogers and Isola high-frequency laminates for RF and microwave designs, and heavy copper boards over 12 oz (16-18 oz in production) for power electronics.

What files do you need to quote?

Gerber files (RS-274X) or ODB++ are sufficient for PCB fabrication quotes. If you also request our optional assembly service, include a BOM and pick-and-place file.

What is the minimum order quantity?

There is no minimum. We build single-piece prototypes and scale the same design to volume production on the same lines.

ISO 9001 · ISO 14001 · IATF 16949 · ISO 13485 · UL Certified

PCB Manufacturer in China

Founded in 2009 · From Quick-Turn Prototype to Volume Production

FR4 — up to 40 layers
HDI — any-layer interconnect
Flex & Rigid-Flex PCB
High-Frequency / High-Speed — Rogers, Taconic, M6/7/8
Heavy Copper · Aluminum / Copper Base
IC Substrate — up to 64 layers

Quickest lead time: 24 h
Simple-board quote back: 1 h

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Trusted by engineering teams in 50+ countries

Up to 40 Layers

Multilayer, HDI and any-layer interconnect

3/3 mil Trace/Space

Fine-line imaging for dense designs

FR-4 to Rogers

High-frequency, metal-core and ceramic substrates

24h Quick-Turn

Prototypes shipped in as fast as 24 hours

160,000m²

Combined monthly capacity

Two Production Bases · Factory & Engineering Strength

Huizhou + Ji’an: two bases built for reliability and scale

Two bases — Huizhou and Ji’an — 160,000 m² monthly capacity. Gerber to finished board under one roof.

In-house Engineering DFM
Every order reviewed by senior engineers before production to catch issues early.
Automated PCB Production
Automated fabrication lines with AOI and electrical testing for repeatable quality.
Full-process Quality Control
From incoming material to final electrical test, traceable at every step.

Explore our factory

Two Production Bases

Huizhou and Ji'an: complementary capacity and expertise

Two independent production bases cover special materials, COB, communication module boards, double-sided, multilayer and HDI production. Engineering assigns each project according to material, layer count, process and delivery requirements.

160,000 m²/month

Combined monthly capacity

Huizhou, Guangdong, China

HUIZHOU SUNKING CIRCUITS ELECTRONICS CO., LTD.

60,000 m²/month

Monthly capacity

Explore Huizhou Base

The Huizhou production base is closely connected to the core cities of the Guangdong-Hong Kong-Macao Greater Bay Area, seizing the commanding heights of global industrial technology innovation. Adjacent to the airport and expressway, it offers a convenient transport network and quick response to customer needs. Huizhou has a monthly production capacity of 60,000 square meters, focusing on special materials (BT materials), polymer materials, COB and communication module boards.

Special materials (BT)
Polymer materials
COB boards
Communication module boards

Ji'an, Jiangxi, China

SUNKING JI AN CIRCUITS ELECTRONICS CO., LTD.

100,000 m²/month

Monthly capacity

Explore Ji'an Base

The Jiangxi Ji'an production base covers an area of 84,000 m², with a total floor area of 120,000 m². Phase one was completed and put into operation in 2023, with a current monthly production capacity of 100,000 m², including 80% double-sided and multilayer circuit boards and 20% HDI boards. The scale of the Ji'an base has reached the leading level in the industry. We integrate an ERP management system and an MES intelligent traceability system; the production line is highly automated and intelligent, providing customers with high-quality and efficient delivery.

Double-sided & multilayer (80%)
HDI boards (20%)
ERP + MES traceability
Highly automated lines

Proven Track Record

Numbers that back our promise

2009

Founded

1,000,000+

Projects delivered

50+

Countries served

160,000m²

Combined monthly capacity

Production bases

99.5%

On-time delivery rate

Our Products

Products

Full range of PCB products from basic single/double-sided boards to advanced HDI and flex boards, meeting electronic manufacturing needs across all industries.

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Resin Plugged Via PCB

SKPCB provides both conventional screen-printing and vacuum resin plugging. Selected vias are filled, cured and planarized to support subsequent lamination, drilling or surface imaging. The process supports buried vias, small vias, thick boards and via-in-pad structures, with the final route confirmed against the stack-up and reliability requirements.

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Heavy Copper PCB

Heavy copper PCBs feature 3oz+ copper thickness, designed for high-current and high-power applications. Excellent thermal dissipation and current-carrying capacity, widely used in power supplies, automotive electronics, and industrial control systems.

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Multi-Layer PCB

Multi-layer PCBs support 4-40 layer configurations for complex circuit designs. High-density interconnection with precise impedance control, ideal for communication equipment, servers, and medical devices.

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HDI PCB

HDI (High Density Interconnect) PCBs utilize microvia and fine line technology for maximum wiring density. Essential for smartphones, tablets, and wearable devices requiring miniaturization.

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Flex PCB

Flexible PCBs use polyimide substrate for bendable circuit solutions. Ideal for dynamic flex applications in consumer electronics, medical devices, and automotive systems.

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Rigid-Flex PCB

Rigid-flex PCBs combine rigid and flexible substrates in one assembly, eliminating connectors and cables. Perfect for aerospace, military, and medical applications requiring reliability and space savings.

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Manufacturing Specifications

PCB manufacturing capabilities in numbers

The parameters engineers ask for most. Full tolerances and finishes on the capability pages.

PCB Fabrication

PCB Fabrication
Layer count	2 – 40 layers (up to 64 for IC substrates)
Board thickness	0.2 – 6.0 mm
Min trace / space	4 / 4 mil (3/3 advanced, 2/2 fine-line)
Min hole size	0.2 mm mechanical / 0.1 mm laser
Copper weight	0.5 oz – >12 oz
Materials	FR-4, Rogers, Isola, aluminum, ceramic, polyimide
Surface finish	HASL, ENIG, OSP, immersion silver / tin, hard gold
Max board size	600 × 570 mm (up to 1250 × 570)

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Industries We Serve

Powering electronics across demanding sectors

Automotive to high-frequency comms — built to each industry’s standard.

Automotive

Medical

Industrial Control

Communications

Consumer Electronics

Aerospace

How We Work

From quote to delivery in four steps

Upload & Quote

Send your Gerber files and get a detailed quote within 1 hour for simple boards, 24 hours for complex builds.

Engineering Review

Our team runs DFM checks and confirms every specification.

Manufacturing

Precision PCB fabrication with full in-process inspection.

Test & Ship

100% electrical testing, then worldwide tracked shipping.

Our Advantages

Why Choose Us

Focused on PCB manufacturing since 2009, delivering high-quality solutions worldwide

Quality Assurance

Strict quality control system with full-process inspection from raw materials to finished products, ensuring the quality of every board.

Fast Delivery

Quick-turn boards ship in as fast as 24 hours. Efficient production processes ensure on-time delivery.

Technical Expertise

Advanced production equipment and experienced engineering team capable of handling all types of complex process requirements.

One-Stop Service

From PCB design review and manufacturing to PCBA assembly, providing complete electronic manufacturing solutions.

What Customers Say

Feedback from customers worldwide

From long-term customers: electronics design and manufacturing teams in Europe and North America.

You guys are absolutely fantastic! Leo and his team are always available to us whenever we need them.
Michael · Germany
I'm happy to put my orders to the Sunking team, they did a great job!
Susanne · United Kingdom
Good job! The new orders will be coming soon.
Sara · Spain
We received the PCBs and they look great!
Marina · Italy
Thanks to the Sunking team — we received the PCBs on time and the quality was good.
Ralf · The Netherlands
We are satisfied with the Sunking team, they always help us in the right way.
Paolo · United States

Certified to international standards

ISO 9001

ISO 14001

IATF 16949

ISO 13485

RoHS

REACH

ISO 13485:2016 medical device quality management certification is held by the group's Ji'an factory, which produces medical orders under that certified system. See the certifications page for the certificate holder and registered scope.

Knowledge Hub

Tech Blog

Professional knowledge sharing on PCB design and manufacturing

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Design Guide

Ceramic Substrate Holes and Outlines: When They Are Formed Decides What You Can Draw | SKPCB

Ceramic is brittle, so holes and outlines cannot follow the FR-4 order of finish-the-board-then-drill-and-rout. This article explains what green-stage forming and post-sinter machining each stake accuracy on, why singulation cannot be copied over, and what the drawing must declare.

Design Guide

Inner-Layer AOI: The Last Moment Inner Layers Are Visible | Sunking PCB

Once a multilayer panel is laminated, its inner layers can never be inspected or reworked. This article explains why inner-layer inspection is a one-way gate, what it can and cannot catch, and what designers must declare before lamination.

Design Guide

Impedance Control: Where the Deviation Actually Comes From | SKPCB

Impedance deviation is not one root cause. Trace width, dielectric thickness, copper thickness and material spread form four independent deviation chains. Which process stage governs each, which the designer can narrow, and which can only be redistributed through the stackup.

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Common Questions

Frequently Asked Questions

Where is your PCB factory located?: We operate two production bases in Huizhou (Guangdong) and Ji’an (Jiangxi), with a combined monthly capacity of about 160,000 m²: Huizhou focuses on special materials, COB and comms boards, while Ji’an is a 120,000 m² smart factory for multilayer and HDI. We ship to customers in more than 50 countries and regions.
How many layers can you manufacture?: From single-sided and double-sided boards up to 40 layers in standard volume production, with HDI also to 40 layers, including any-layer interconnect structures with laser-drilled microvias. IC substrates run to 64 layers.
What is your quick-turn lead time for prototypes?: Quick-turn prototypes can ship in as fast as 24 hours. Standard multilayer production runs 3 to 15 working days depending on layer count and finish.
Do you provide value-added assembly services?: Yes. When required, PCBA is available as an optional value-added service, including component sourcing, SMT and through-hole assembly. Our core business and primary focus remain PCB fabrication.
Which certifications does your factory hold?: We are certified to ISO 9001, ISO 14001 and IATF 16949, with UL, RoHS and REACH compliance for the relevant product lines.
Can you build high-frequency and heavy copper boards?: Yes. We process Rogers and Isola high-frequency laminates for RF and microwave designs, and heavy copper boards over 12 oz (16-18 oz in production) for power electronics.
What files do you need to quote?: Gerber files (RS-274X) or ODB++ are sufficient for PCB fabrication quotes. If you also request our optional assembly service, include a BOM and pick-and-place file.
What is the minimum order quantity?: There is no minimum. We build single-piece prototypes and scale the same design to volume production on the same lines.

See all FAQs

Ready to start your project?

Upload your Gerber files for a quote. Our engineering team replies within 1 hour for simple boards and within 24 hours for complex builds.

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