Aluminum PCB

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Why is aluminum used in the circuit board?

Heat is the biggest threat to LEDs and silicon semiconductors.With the rapid development of the electronic industry, the size of electronic products is getting smaller and smaller, and the power density is getting higher and higher.Aluminum PCB vs Copper PCB is undoubtedly one of the effective means to solve the heat dissipation problem.

Let's take a closer look at the aluminum PCB, what is aluminum PCB and find out why we chose them. Here are some advantages of aluminum based PCBs when compared to fiberglass PCB boards.

Aluminum is like an energy store (15 kWh/Kg), so it has a great value that cannot be wasted and its recycling translates into energy recovery. 

The properties that make aluminum such a profitable metal are: its lightness (about a third of the weight of copper and steel), corrosion resistance (very useful characteristic for those products that require protection and conservation), resistance, is a Good conductor of electricity and heat, it is not magnetic, it is not toxic and it is very ductile.

PCB aluminum plate is a unique group metal substrate clad copper, aluminum PCB board has good thermal conductivity, electrical insulation properties, and mechanical workability.

1.Heat dissipation. This is the most obvious benefit of aluminum base PCB. Aluminum is one of the best materials available to dissipate heat from the crucial components of circuit boards by transferring heat outdoors to avoid too much heat in these components, which could cause serious damage to the board. Polyimide resin filled with a high thermal filler Body solution. When talking about thermal resistance, aluminum PCB is the first that comes in the mind due to its low thermal conductivity. Because of this thermal property of aluminum PCB thermal expansion does not affect it. 2.Low cost. Aluminum is easy and inexpensive to extract, which helps reduce the costs in the manufacturing process. Thus, the construction of products with aluminum is less expensive. And there by drive more customer to your business.
3.Environmentally friendly. Aluminum is not toxic and is easily recyclable, causing a lower effect on the environment without additional weight. There are no much hazards in the manufacturing and designs processes.
4.A longer life. Aluminum unlike the other normal materials used in PCB designs, such as copper foil materials and electrical insulation, aluminum PCB will be less likely to peel off, which will further extend the product's shelf life. This is a point to consider while manufacturing electronics base products for customer.

All these advantages make aluminum base PCB an excellent choice for applications that require high power yields within tight tolerances. They are widely used in automotive and power electronics, and thermal sensitive equipment or anything else that heat can damage it's components, such as LED lighting, is the greatest use of aluminum printed circuit boards.

Aluminum PCB Board Applications

1.High brightness LED lighting/backlight module

2.Power electronics (inverter, transistor, DC/DCconverter, regulator)

3.Automotive (regulator, power module)

4.Audio (equalizer, amplifier)

About the aluminum base

1、According to the material classification of the aluminum base, it can be divided into 1100,3003,5052,6061. The performance table of aluminum alloy is as follows:

2、Thermal conductivity is a parameter that indicates thermal conductivity. The size of thermal conductivity depends on the structure, state, density, temperature, etc. of the substance.According to the thermal conductivity of the aluminum base, it can be divided into 1W/m.k, 1.2W/m.k,1.5W/m.k,2W/m.k,3W/m.k,4W/m.k,6W/m.k,8W/m.k . The formula for calculating the resonance coefficient is as follows:

3、According to the number of layers, it can divide into single-sided aluminum PCB and double-sided aluminum PCB. Single-sided aluminum PCB have only one-sided circuits, while double-sided aluminum PCB has two-sided circuits. The conduction of the circuits is completed by two-layer circuits, and the heat is done with aluminum base.

4、During aluminum PCB design, it is necessary to control the spacing size of the circuit and the distance between the circuit and the edge of the plate. If the circuit is too close to the edge of the plate, the finished plate is prone to creepage when voltage is applied, leading to the breakdown of the plate and scrap.If you have any questions during the design process, please contact us and we will provide you with a reasonable solution. The following is the calculation formula for line width.

Why choose PCBONLINE Aluminum PCB

1.In the sheet Material aspect, we have our own sheet Material factory (Yugu Chemical Material Ltd.). Yugu company focuses on medium and high-grade aluminum substrate materials, using 3003, 5052, 6061 aluminum substrate materials, the thermal conductivity of 1.5w, 2W, 3W, 4W, the highest breakdown pressure of 4000V.

Yugu aluminum substrate materials

Item Condition Typical Value
YGA-4-1 YGA-4-2 YGA-4-3 YGA-4-4 YGA-4-5 YGA-4-6
Peel Strength(N/mm) A
After Thermal Stress
Surface Resistance(MΩ) A
Volume Resistivity(MΩ.cm) A
Break-Down Voltage(KV) D-48/50+D-0.5/23 ≥3 ≥4 ≥5 ≥8 ≥10 ≥12
Dielectric Constant(1MHz) C-96/35/90+R
≤8 ≤8 ≤8 ≤8 ≤8 ≤8
Dissipation Factor(1MHz) C-96/35/90+R
≤0.03 ≤0.03 ≤0.03 ≤0.03 ≤0.03 ≤0.03
Thermal Stress 288℃ 2min No Blistering, No delaminating
Flammability A V-0
CTI (V) A 600 600 600 600 600 600

2.Meanwhile, we also have other corresponding partners. The figure below shows the parameters of sheet material:

Ventec General Properties

Product Thermal Conductivity
Thermal Impedance
Dielectric Break Down
(@1 MHz)
(@1 MHz)
(UL 94)
without Glass reinforcement
VT-4B7 7.0 0.017 6000 100 380 4.8 0.016 130 v-0
VT-4B5SP 4.2 0.015 3000 120 380 4.8 0.016 130 v-0
VT-4B5L 3.6 0.034 7000 100 380 4.8 0.016 130 v-0
VT-4B5 4.2 0.029 7000 120 380 4.8 0.016 130 v-0
VT-4B3 3.0 0.040 7000 130 380 4.8 0.016 130 v-0
VT-4B1 1.0 0.117 6000 100 380 4.8 0.016 130 v-0
Glass reinforced
VT-4A2H 2.2 0.054 6000 130 380 5.1 0.014 105 V-0
VT-4A2 2.2 0.054 6000 130 380 5.1 0.014 90 V-0
VT-4A1 1.6 0.074 6000 130 380 5.0 0.015 90 V-0

TOTKING General Properties

Test Item Test Method Units Product model Index
T-110 T-111 T-112 T-113 T-311 T-411 T-511
Thermal Conductivity ASTM-D5470 W/m.k 1.5 2.0 3.0 1.8 2.0 2.0 3.0
Thermal impedance Internal
TO-220 Test
℃/W 0.65 0.55 0.45 0.6 0.6 0.6 0.45
Peel Strength IPC-TM-605
N/mm 2.0 1.8 1.6 1.3 1.8 1.8 1.8
Flammability UL94
Class V-0 V-0 V-0 V-0 V-0 V-0 V-0
288℃.Thermal Stress IPC-TM-650
S 120 120 120 120 60 60 60
Tg IPC-TM-650
100 100 100 100 100 100 100
1MHz.Dielectric Constant IPC-TM-650
- 5.5 6.5 7.0 6.0 6.5 6.5 6.5
Volume Resistivity IPC-TM-650
MΩ-cm 10^7 10^7 10^7 10^7 10^7 10^7 10^7
Surface Resistance IPC-TM-650
10^5 10^5 10^5 10^5 10^5 10^5 10^5
Dielectric Breakdown IPC-TM-650
KVAC 7.0 7.0 6.0 6.0 7.0 7.0 7.0
Typical Proof Test QB/JS-YF-002 KVAC 5.0 5.0 4.0 4.0 5.0 5.0 5.0
CTI IEC60112 V 600 600 600 600 600 600 600
Moisture Absorption IPC-TM-650
% 0.03 0.03 0.03 0.03 0.03 0.03 0.03
The Dielectric Layer Thickness of tested sample 0.1mm/4mil

POLYTRONICS General Properties

Item Test Method Test Condition Product Name(UL Type Name)
Thermal Conductivity [W/m-K] ASTM D5470 C-96/25/65 2 3 4 8
Typical Break Down Voltage [AC KV] JIS C 2110 C-96/25/65
Solder Floating, 260℃/30 min
150℃ ~ -50℃/1000 cycles
5.0 5.0 4.5 4.5
Typical Peeling Strength [N/cm] JIS C 6481 C-96/25/65 18 18 18 18
Solder Floating, 260℃/30 min
150℃ ~ -50℃/1000 cycles
C-1000/85/85 14 14 14 14
Water Absorption IPC-TM-650 23℃/24hrs <0.5 <0.5 <0.5 <0.5
Dielectric Constant IPC-TM-650 C-96/25/65, 1MHz 4.6 4.8 4.9 5.2
Dielectric Loss Tangen IPC-TM-650 C-96/25/65, 1MHz 0.021 0.021 0.022 0.024
Capacitance IPC-TM-650 C-96/25/65, 1MHz 1.1 1.1 1.2 1.2
Surface Resistance IPC-TM-650 C-96/25/65, 1MHz >10^15 >10^15 >10^15 Under Evaluation
Volume Resistance IPC-TM-650 C-96/25/65, 1MHz >10^13 >10^13 >10^14 Under Evaluation
Glass Transition Temp IPC-TM-650 2.4.25 DSC 130 130 140 140
Thermal Resistance JIS C 6481 Solder Floating, 260℃ >60 >60 >60 >60
IPC-TM-650 TMA T260 >60 >60 >60 >60
T288 >30 >30 >30 >30
T300 >2 >2 >3 >2
Decomposition Temp. IPC-TM-650 TGA 2%
Thermal Expansion IPC-TM-650 TMA > Tg
< Tg
Thermal Expansion IPC-TM-650 TMA 50~260℃ 0.68 0.54 0.52 0.58
Comparative Tracking Index UL 746E C-40/25/50 600 600 600 600
Flammability UL 94 C-40/25/50 V-0 V-0 V-0 V-0

3.Not only have our own sheet material, PCBONLINE is also an aluminum PCB manufacturer specializing in the production of aluminum PCB in China, and we have rich experience in the production of aluminum PCB.
A.Because the rigidity of aluminum-based material is much harder than that of FR4, the machines used by PCBONLINE are all customized for making aluminum substrate, so as to improve the problems of breaking knives and burrs;
B.Ink printing has always been a difficult aspect to control in the production of aluminum PCB, especially white ink. In many cases, when the aluminum PCB is SMT patch, after reflow welding, the ink will turn yellow. The ink used by PCBONLINE is TAIYO and other international brand ink, which ensures that the ink will not yellow.
C.Double-sided aluminum PCB. PCBONLINE has its own sheet material factory. The ceramic filler is adopted in the insulation layer of all double-sided aluminum substrate to ensure thermal conductivity and plate non-layering and other undesirable issues.

4.Equipped with advanced equipment, full-line operation, including LDI exposure machine, automatic test machine , automatic punching machine, and so on.

5.PCBONLINE can reduce your aluminum PCB cost while you getting a high-quality board.In addition, we have in-depth research on other aluminum-related products. E.g: aluminum Nitride PCB 、flexible aluminum PCB、aluminum flex PCB、aluminum foil PCB、aluminum PCB for led, and so on.

In many countries, Aluminum PCB also known aluminum foil PCB、aluminum clad PCB、aluminum backed PCB、aluminum core PCB、aluminum PCB prototyping、aluminum PCB LED. And if you have any questions about Aluminum PCB stack up, please feel free to contact