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Solutions of Printed Wiring BoardsAutomotive Printed Wiring Boards

As your development partner, Hitachi Chemical offers not only PWB design solutions to meet emerging requirements for electromechanical interconnection, including thick copper PWB for EV and HEV applications, but also highly reliable products based on our global quality assurance system in each production process.

Typical Application (Electronic Control Units for EV)

Our PWBs are designed to meet the requirements of high current, high heat transfer and high heat dispersion in addition to the high density design while maintaining appropriate characteristic impedance control capability.

Typical Application (Electronic Control Units for EV)

Specifications and Technology Trend

Tighter control of characteristic impedance is required for Electronic Control Units (ECU). We offer thicker copper conductivetechnology for higher electric current in the EV systems. See the following chart:

Application Classification Item Technology Trend
ECU With Character Impedance Layer 8 8 10 12
Impedance 100±10% 100±10% 100±7% 100±5%
Aspect Ratio 6.4 6.4 6.4 8.0
Via/Pad Dia. Φ0.30/Φ0.60mm Φ0.25/Φ0.55mm Φ0.25/Φ0.50mm Φ0.20/Φ0.45mm
Pattern Pitch 0.2mm 0.2mm 0.18mm 0.16mm
IL Pattern Clear 0.3mm 0.3mm 0.3mm 0.3mm
BGA Pad Pitch 1.0mm 1.0mm 0.8mm 0.6mm
EV System Thick Copper Conductor Layer 4 6 6 8
IL Copper Thickness 2oz 2oz 3oz 3oz
OL Copper Thickness 2oz 3oz 4oz 5oz
OL Trace Pitch 0.25mm 0.40mm 0.60mm 0.80mm
Via/Pad Dia. Φ0.4/Φ1.0mm Φ0.4/Φ1.0mm Φ0.3/Φ1.0mm Φ0.3/Φ0.9mm
Copper Plating Thick 25μm 30μm 50μm 50μm

Cross Section Structure

10 Layers PWB for ECU10 Layers PWB for ECU
Board Thickness: 1.6mm,
Distance of Layers: 0.1mm (4 Cores)

Hole Plug Process
PWB for ETC
Hole Plug Process PWB for ETC
Pad on Via Cross Section for
High Density Assembly

4 Layers Thick Copper
PWB for EV
4 Layers Thick Copper PWB for EV
Inner Layer: 2oz
Outer Layer: 2oz + Copper Plating
Board Thickness: 1.6mm
Distance of Layer: 0.3mm (1 Core 4 Layer)

Technical Advantages

We offer advanced board design and performance enhancement meeting your requirements by using our core technology and know-how for module board fabrication in conjunction with our tailored material development.

Castellation Terminals with Bottom Pads

We can effectively minimize layer count by employing our castellation technology.

Castellation Terminals with Bottom Pads

Aluminum Base PWB

To meet the requirement of high electric current and high heat dispersion, our aluminum based boards are applied in Electric Power Steering Systems.

Aluminum Base PWB

Characteristic Impedance Control

For a requested impedance value, we can design and propose the most suitable layer structure, line width and line space. For example: the tolerance is set as shown below:

Characteristic Impedance Control

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