China PCB Manufacturing & Assembly | Union Circuits

Engineered for Excellence

At Union Circuits, we specialize in end-to-end electronic manufacturing solutions. From single-layer PCBs to complex HDI and rigid-flex assemblies, our advanced facilities in China deliver precision, speed, and scalability.

With decades of combined expertise, we support industries ranging from industrial automation to medical devices, ensuring every board meets the highest standards of performance and reliability.

ISO 9001 & IATF 16949 Certified
RoHS & Halogen-Free Compliant
Fast Turnaround: As Low as 24 Hours

Comprehensive PCB Services

From design to delivery, we offer a full suite of PCB manufacturing and assembly services tailored to your project’s complexity and volume.

PCB Fabrication

High-precision manufacturing of single-sided, double-sided, multilayer, HDI, and heavy copper PCBs with tight tolerances and advanced materials.

• Up to 32-layer PCBs
• Laser-drilled microvias
• Impedance control
• RoHS & lead-free options

Parts Procurement

Full component sourcing with verified suppliers. We handle resistors, capacitors, ICs, connectors, and electromechanical parts with traceability.

• Global supplier network
• Obsolete part replacement
• Counterfeit prevention
• BOM optimization

PCB Assembly

SMT, DIP, mixed-technology, BGA rework, and full turnkey assembly with functional testing and conformal coating options.

• 01005 to large BGAs
• Lead-free & leaded options
• AOI & X-ray inspection
• Box build & system integration

Our PCB & Component Solutions

Explore our range of specialized PCB types and electronic components designed for performance, durability, and innovation.

Multilayer PCB

Multiple conductive layers for complex routing and high-density designs. Ideal for computing and telecom applications.

Industrial Control PCB

Robust boards for automation, PLCs, and motor drives. Designed for harsh environments and long-term reliability.

Inductors

High-efficiency magnetic components for power supplies, filters, and energy storage circuits.

Transformers

Isolation and voltage conversion transformers for power systems, industrial equipment, and medical devices.

HDI PCB

High-density interconnect with microvias and fine traces. Perfect for smartphones, wearables, and compact electronics.

Metal Core PCB

Aluminum or copper-backed boards for superior thermal management in LED lighting and power electronics.

Flexible Circuits

Thin, bendable polyimide PCBs for dynamic flexing and space-constrained applications.

Rigid-Flex PCB

Combines rigid and flexible layers for 3D packaging. Used in aerospace, medical, and military systems.

Serving Global Industries

Our solutions power innovation across sectors where reliability, precision, and compliance are critical.

Industrial Automation

PLCs, motor drives, sensors, and control systems built for 24/7 operation.

Medical Devices

High-reliability PCBs for diagnostics, monitoring, and life-support systems with strict regulatory compliance.

Telecommunications

High-frequency and RF PCBs for 5G, routers, base stations, and network infrastructure.

Frequently Asked Questions

What file formats do you accept for PCB design?

We accept Gerber files (RS-274X), Excellon drill files, IPC-2581, and ODB++. Please include stack-up, impedance, and special instructions if applicable.

Do you offer DFM checks?

Yes, we provide free Design for Manufacturability (DFM) analysis to ensure your design is production-ready and minimize delays.

What is your minimum order quantity?

We support prototypes, small batches, and high-volume production. MOQ is 1 piece for most PCB types.

Are your PCBs RoHS compliant?

Yes, all our standard PCBs are RoHS and REACH compliant. Lead-free assembly is available upon request.

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Precision PCB Manufacturing & Assembly in China