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Metal Core PCB

Metal Core PCB

The most common MCPCB construction consists of the following 3 layers:


 1) A metal substrate, typically aluminum. In some applications, a copper substrate is more appropriate due to its high thermal conductivity than aluminum (401W/MK versus 237 W/MK) but more expensive

 
2) Epoxy dielectric layer. This is the most important layer in the MCPCB construction as it affects the thermal performance, electrical breakdown strength, and, in some cases, the solder joint performance of the MCPCB system. The typical thermal conductivity of the dielectric layer on a MCPCB is 1W/MK. A higher value is better for good thermal performance. A thinner dielectric layer is better for thermal performance as well but can negatively impact the ability of the MCPCB to withstand a high potential test to meet minimum electrical safety standards as required in certain lighting markets. The typical dielectric thickness layer is 100μm.

 
3) Top copper layer. A thicker copper layer improves heat spreading into the PCB but may pose challenges for PCB manufacturers when fabricating narrow traces or spaces. A copper thickness of 1oz (35μm) or 2oz (70μm) is common.

 

Metal Core PCB Capability 2020
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)


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