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Copper Based PCB Manufacturing Printed Circuit Board On Copper Core Insulated Metal Substrate (IMS PCB) and Metal core PCB (MCPCB)
1. Copper Based PCB
Copper core PCB is one of the most expensive metal substrates, and its thermal conductivity is many times better than that of aluminum and iron substrates. It is suitable for high frequency circuits, high and low temperature changing regions and the heat dissipation.
2. Layer up
The circuit layer of copper substrate is required to have a large current-carrying capacity, so a thick copper foil should be used, the thickness of which is generally 35 μ m ~ 280 μ m;
Thermal insulation layer is the core technology of copper substrate too. The core thermal conductivity is composed of aluminum trioxide and silicon powder and polymer filled with epoxy resin, the thermal resistance is low (0.15), viscoelasticity is excellent, and it has the ability to resist thermal aging. It is able to withstand mechanical and thermal stress.
Metal base is the support member of copper PCB. It is required to have high thermal conductivity, generally copper sheet is used because copper can provide better thermal conductivity, suitable for drilling, punching, shearing and cutting and other conventional machining.
1.3 Metal Core PCB Capability 2021
| Metal Core PCB Capability | ||
| NO. | Parameter | Value |
| 1 | Type of Metal Core | Aluminum, Copper, Iron |
| 2 | Model of Metal Core | A1100, A5052, A6061, A6063, C1100 |
| 3 | Surface Finish | HASL, Immersion Gold, Immersion Silver, OSP |
| 4 | Thickness of Surface plating | HASL: Sn>2.54µm, ENIG: Au 0.025-0.1µm, Ni 2.5-5µm |
| 5 | Layer Count | 1-4 Layers |
| 6 | Maximum of Board Size | 23" x 46" (584mm×1168mm) |
| 7 | Mininum of Board Size | 0.1969" x 0.1969" (5mm×5mm) |
| 8 | Board Thickness | 0.0157" x 0.2362" (0.4-6.0mm) |
| 9 | Copper Thickness | 0.5OZ(17.5µm),1OZ(35µm),2OZ(70µm),3OZ(105µm),4OZ(140µm) to 10oz (350µm) |
| 10 | Minimum Track Width | 5mil (0.127mm) |
| 11 | Minimum Space | 5mil (0.127mm) |
| 12 | Minimum Hole Size | 0.0197" (0.5mm) |
| 13 | Maximum Hole Size | No limit |
| 14 | Minimum Holes Punched | PCB thickness <1.0mm: 0.0394" (1.0mm) |
| PCB thikness 1.2-3.0mm: 0.0591" (1.5mm) | ||
| 15 | PTH Wall Thickness | >20µm |
| 16 | Tolerance of PTH | ±0.00295" (0.075mm) |
| 17 | Tolerance of NPTH | ±0.00197" (0.05mm) |
| 18 | Deviation of Hole Position | ±0.00394" (0.10mm) |
| 19 | Outline Tolerance | Routing: ±0.00394" (0.1mm) |
| Punching: ±0.00591" (0.15mm) | ||
| 20 | Angle of V-cut | 30°, 45°, 60° |
| 21 | V-cut Size | 0.1969" x 47.24" (5mm×1200mm) |
| 22 | Thickness of V-cut Board | 0.0236" x 0.1181" (0.6-3mm) |
| 23 | Tolerance of V-cut Angle | ±5º |
| 24 | V-CUT Verticality | ≤0.0059" (0.15mm) |
| 25 | Minimum Square Slots Punched | PCB thickness < 1.0mm: 0.0315" x 0.0315" (0.8 x 0.8mm) |
| PCB thickness 1.2-3.0mm: 0.0394" x 0.0394" (1.0 x 1.0mm) | ||
| 26 | Minimum BGA PAD | 0.01378" (0.35mm) |
| 27 | Minimum Width of Solder Mask Bridge. | 8mil (0.2032mm) |
| 28 | Minimum Thickness of Solder Mask | >13µm (0.013mm) |
| 29 | Insulation Resistance | 1012ΩNormal |
| 30 | Peel-off Strength | 2.2N/mm |
| 31 | Solder float | 260℃ 3min |
| 32 | E-test Voltage | 50-250V |
| 33 | Thermal Conductivity | 0.8-8W/M.K |
| 34 | Warp or Twist | ≤0.5% |
| 35 | Flammability | FV-0 |
| 36 | Minimum Height of Component indicator | 0.0059"(0.15mm) |
| 37 | Minimum Open Solder Mask on Pad | 0.000394" (0.01mm) |
