Heavy Copper 8 Layer Multilayer PCB Board 600x500mm Immersion Silver For EV Charging Pile Power Module

Product Overview

The Heavy Copper 8 Layer Multilayer PCB Board is engineered for high current power conversion hardware. With 3oz (105µm) finished copper on outer layers and 2oz on inner layers, the board carries up to 40% more current than conventional 1oz multilayer designs without widening trace geometry. A 600x500mm working panel, 2.0mm finished thickness and immersion silver surface make it a production-ready platform for EV charging pile power modules, motor drives and industrial inverters.

Why this stack-up works for power electronics

• 3oz heavy copper outer layers — continuous current capacity raised to 18A per 1mm trace at 10°C rise, so fewer copper bars and busbars are needed on the assembly.
• Symmetrical 8 layer build — 1-2-2-2-1 copper distribution keeps the panel flat after reflow, with warpage held below 0.5% on a 600x500mm panel.
• Immersion silver finish — 0.1–0.2µm Ag layer provides a solderable, aluminium-wire-bondable surface that survives three reflow cycles and 12 months of storage.
• TG170 FR4 laminate — Z-axis expansion of 3.0% at TG170 keeps plated through holes reliable through 6 reflow passes and thermal cycling from -40°C to 150°C.
• 2.0mm finished thickness — mechanically stiff enough for 6mm standoff mounting inside charger enclosures without stiffening ribs.

Technical Parameters

Where it is used

EV charging pile power modules. The 8 layer heavy copper stack distributes 30kW three-phase AC-DC rectifier current across wide inner planes, removing the need for laminated busbars inside the charger cabinet.

Industrial motor inverters. Thick copper planes act as a heatsink path between IGBT modules and the cold plate, holding junction temperatures 8–12°C lower than 1oz designs at the same load.

Energy storage DC-DC converters. The 600x500mm panel size fits a full bidirectional converter stage on a single board, cutting interconnect joints and assembly labour.

Quality control

• Flying probe electrical test on 100% of panels, 4-wire resistance check on heavy copper nets
• Cross-section and micro-section audit every 200 panels for copper thickness and plating uniformity
• Thermal shock 288°C / 10s solder float, 3 passes
• Ionic contamination test ≤1.56µg NaCl/cm²

OEM and customization

Copper weight from 2oz to 6oz, panel sizes up to 600x500mm, and stack-ups from 4 to 16 layers are available on request. Send your Gerber data and current requirement, and our engineering team will return an impedance and thermal review within two working days.

Request a heavy copper quote today — sample panels ship in 5 working days.