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FR-4 Double-Sided PCB

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Our FR-4 double sided PCB features conductive circuitry on both sides of an FR-4 substrate, providing additional routing space for electronic designs that require more connections than a single-sided board can accommodate.

The listed configuration includes a 1.6 mm board thickness, 1 oz copper weight, green solder mask, and a minimum drilling hole size of 0.5 mm. Custom fabrication requirements can be reviewed according to your Gerber files, electrical requirements, and assembly specifications.

Product Highlights

  • Two-Sided Copper Circuitry

  • FR-4 Base Material

  • 1.6 mm Board Thickness

  • 1 oz Copper Weight

  • Green Solder Mask

Availability:
Quantity:
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Product Specifications

Parameter

Specification

Product Name

FR-4 Double Sided PCB

PCB Type

Double-Sided Rigid PCB

Number of Conductive Layers

2

Base Material

FR-4

Board Thickness

1.6 mm

Copper Weight

1 oz

Solder Mask Color

Green

Minimum Drilling Hole Size

0.5 mm

The specifications above describe the currently listed product configuration. Other board dimensions, copper weights, drilling requirements, and surface finishes should be confirmed according to the design files and manufacturing requirements.

How Double Sided PCB Construction Works

A double sided PCB uses conductive copper circuitry on both the top and bottom surfaces of an insulating substrate. This two-layer structure provides additional space for routing electrical connections and arranging electronic components.

Depending on the circuit design, plated through-holes or other specified interconnections can connect conductive features between the two sides. This allows designers to distribute circuit connections across both surfaces rather than routing every connection on a single layer.

For projects with more components, branching connections, or limited board space, a double sided PCB can offer greater layout flexibility than a single-sided design.

The final construction depends on the circuit layout, hole structure, electrical requirements, and approved fabrication data.

Why Choose an FR-4 Double Sided PCB?

More Routing Space

Conductive circuitry on both sides provides additional routing options for designs with multiple electrical connections.

Flexible Component Layout

Designers can distribute components and circuit traces across the top and bottom surfaces to accommodate different layout requirements.

Rigid FR-4 Substrate

FR-4 glass fiber reinforced epoxy laminate provides an insulating substrate for rigid PCB construction.

Practical Two-Layer Construction

Compared with multilayer designs, a double sided PCB uses two conductive layers and can be suitable for projects that do not require additional internal circuit layers.

Custom Fabrication Requirements

Board dimensions, copper weight, hole specifications, solder mask, and surface finish can be reviewed according to the intended application and design files.

Double Sided PCB vs. Single Sided PCB

Comparison Item

Single Sided PCB

Double Sided PCB

Conductive Circuitry

One side

Both sides

Routing Space

Limited to one conductive layer

Additional routing space

Circuit Complexity

Suitable for simpler compatible layouts

Suitable for designs requiring more connections

Component Layout

More constrained by one-sided routing

Greater layout flexibility

Design Considerations

Layer count and routing simplicity

Interlayer connections and two-sided routing

Typical Selection Factor

Simple circuit requirements

More complex routing or limited board space

A single-sided PCB may be suitable when the complete circuit can be routed on one conductive layer. A double sided PCB provides more routing flexibility when the design requires additional connections.

The appropriate option depends on the circuit design, component density, electrical requirements, board dimensions, and manufacturing cost.

Manufacturing Capabilities and Custom Options

Double sided PCB manufacturing involves several interdependent specifications. The final configuration should be reviewed against the Gerber files before production.

Parameter

Available Reference / Option

Base Material

FR-4; CEM-1 subject to board structure

Board Thickness

Current product: 1.6 mm; other thicknesses subject to confirmation

Copper Weight

Current product: 1 oz; 2 oz and 3 oz options listed in general factory capability data

Minimum Drilling Hole

Current product listing: 0.5 mm

Minimum Trace / Space

Standard factory reference: 0.20 / 0.20 mm; tighter designs require review

Solder Mask Colors

Green, Black, White, Blue

Silkscreen Colors

White, Black

Board Outline Tolerance

General factory reference: ±0.10 mm

Board Thickness Tolerance

General factory reference: ±10%

Maximum Panel Size

General factory reference: approximately 490 × 600 mm

General manufacturing references are not guaranteed specifications for every double sided PCB. Actual capabilities depend on board construction, copper weight, drilling requirements, dimensions, and production process.

Please submit your Gerber files to confirm the applicable specifications for your project.

PCB Surface Finish Options

The surface finish protects exposed copper and provides a suitable surface for component assembly. Selection depends on solderability, component requirements, storage conditions, and the intended assembly process.

Lead-Free HASL

A hot-air-leveled solder finish that can be considered for compatible PCB assembly requirements.

OSP (Organic Solderability Preservative)

An organic protective coating applied to exposed copper. It can be suitable for designs with compatible assembly and storage requirements.

Immersion Tin

A tin-based finish option for PCB designs requiring a suitable solderable surface.

ENIG (Electroless Nickel Immersion Gold)

A nickel-gold finish commonly considered for flat soldering surfaces and designs using fine-pitch components.

Flash Gold

A gold-plating option for specified contact or connection requirements, subject to the applicable finish specification.

The available surface finishes for this double sided PCB should be confirmed before ordering.

Applications of FR-4 Double Sided PCB

Double sided FR-4 PCBs can be used in electronic products that require routing across two conductive layers.

Industrial Control Equipment

Suitable for compatible control interfaces, monitoring circuits, and electronic control modules.

Consumer Electronics

For electronic modules and circuit designs requiring more routing flexibility than a single-sided layout.

Power Supply Circuits

For compatible power supply control and auxiliary circuits, subject to current, thermal, and electrical requirements.

LED Control Systems

For LED driver control circuits and related electronic modules where the selected PCB construction meets the design requirements.

Communication and Interface Electronics

For compatible interface boards and communication-related electronic circuits that benefit from two-sided routing.

Final application suitability depends on circuit complexity, operating conditions, electrical loading, and component layout.

PCB Manufacturing and Quality Control

Reliable double sided PCB production requires accurate alignment between the two circuit layers, controlled drilling, appropriate interconnection processes, and inspection against the approved fabrication data.

Circuit Pattern Inspection

Review copper traces, pads, clearances, and circuit features against the approved design files.

Drilling and Hole Inspection

Verify drilling locations and hole dimensions against the fabrication requirements.

Layer Registration

Check the alignment of the top and bottom circuit patterns according to the applicable manufacturing tolerances.

Electrical Testing

Continuity and isolation testing can be specified where supported by the manufacturing process and order requirements.

Final Inspection

Inspect the finished board against the agreed dimensions, appearance requirements, and fabrication specifications before delivery.

Testing methods and acceptance criteria should be confirmed for each project.

What to Provide for a Double Sided PCB Quote

A complete set of design and order information helps the manufacturing team assess feasibility and prepare a project-specific quotation.

1. Gerber Files

Provide the top and bottom copper layers, solder mask layers, silkscreen layers, and board outline as applicable.

2. Board Specifications

Confirm the board dimensions, finished thickness, copper weight, drilling requirements, and preferred surface finish.

3. Electrical Requirements

Provide relevant circuit requirements, including current, voltage, and any specified electrical testing criteria.

4. Order Quantity

Indicate the required quantity and whether the project is for prototyping, small-batch production, or volume manufacturing.

5. Delivery and Inspection Requirements

Provide your target delivery schedule and any applicable packaging, labeling, or inspection requirements.

Frequently Asked Questions

What is an FR-4 double sided PCB?

An FR-4 double sided PCB is a rigid printed circuit board with conductive circuitry on both sides of an FR-4 insulating substrate. The two-sided structure provides additional routing space for electronic designs.

What is the board thickness of this product?

The currently listed configuration has a board thickness of 1.6 mm. Other thickness requirements should be confirmed according to the design and manufacturing process.

What copper weight is specified for this PCB?

The currently listed configuration specifies 1 oz copper weight. Other copper weights may be considered subject to the design requirements and confirmed manufacturing capabilities.

What is the minimum drilling hole size?

The current product listing specifies a minimum drilling hole size of 0.5 mm. Different hole requirements should be reviewed against the fabrication files before production.

What is the difference between a single sided and double sided PCB?

A single-sided PCB has conductive circuitry on one side, while a double sided PCB has circuitry on both sides. Double sided construction offers more routing options for designs with additional electrical connections.

Which surface finishes can be used on a double sided PCB?

Potential options include lead-free HASL, OSP, immersion tin, ENIG, and flash gold. Availability depends on the board construction and manufacturing requirements and should be confirmed before production.

Can I customize an FR-4 double sided PCB?

Custom requirements can be submitted for review, including board dimensions, board thickness, copper weight, drilling specifications, solder mask, and surface finish.

What files are required for a quotation?

Gerber files are the primary starting point for fabrication review. Include board dimensions, drilling data, required quantity, copper specifications, and other applicable technical requirements.

Request a Quote for Your FR-4 Double Sided PCB

Looking for a manufacturing partner for your double sided PCB project?

Send us your Gerber files and technical requirements for a manufacturing review. Our team can assess the proposed board construction, dimensions, copper weight, drilling requirements, and surface finish before quotation.

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