What is aluminium pcb thermal resistance?

Aluminum PCBs have good thermal conductivity and low thermal resistance compared to traditional FR4 PCBs.
The thermal resistance of an aluminum PCB depends on the thickness of the aluminum layer, the thickness of the dielectric layer, and the copper thickness.

Andwin provide thermal pad metal core PCB for customer, email us now for you PCB quote,
Email is : mcpcb@andwinmcpcb.com

What Is aluminium pcb thermal resistance?

Generally, the thicker the aluminum layer, the lower the thermal resistance. The thermal resistance of an aluminum PCB can be calculated using the following formula:

Rθ = Td / (kA) + θc


  • Rθ is the thermal resistance in °C/W
  • Td is the thickness of the dielectric layer in meters
  • k is the thermal conductivity of the dielectric layer in W/mK
  • A is the area of the aluminum layer in square meters
  • θc is the thermal resistance of the copper layer in °C/W

In general, aluminum PCBs have a thermal resistance of around 1-2 °C/W, which is much lower than traditional FR4 PCBs.
This makes them ideal for applications that require high thermal performance, such as LED lighting, power electronics, and automotive electronics.

Types of aluminium pcb thermal resistance

There are two types of thermal resistance associated with aluminum PCBs:

  1. Junction-to-Case Thermal Resistance (RθJC):
    This is the thermal resistance between the junction of the component and the aluminum PCB.
    It measures the ability of the PCB to transfer heat away from the component and dissipate it into the surrounding environment.
  2. Case-to-Ambient Thermal Resistance (RθCA):
    This is the thermal resistance between the aluminum PCB and the surrounding environment.
    It measures the ability of the PCB to dissipate heat into the air or other cooling medium.

Both of these thermal resistances are important in determining the overall thermal performance of an aluminum PCB.
A low RθJC indicates that the PCB can efficiently transfer heat away from the component, while a low RθCA indicates that the PCB can efficiently dissipate heat into the surrounding environment.

A well-designed aluminum PCB will have low values for both RθJC and RθCA, resulting in efficient heat dissipation and improved reliability of the electronic system.

the role of aluminium pcb thermal resistance

Aluminium PCB thermal resistance plays a crucial role in the performance and reliability of electronic devices.
The thermal resistance of an aluminium PCB determines its ability to dissipate heat generated by the components mounted on it.
The higher the thermal resistance, the more difficult it is for the PCB to dissipate heat, which can lead to overheating and failure of the electronic components.

Aluminium PCBs are known for their excellent thermal conductivity, which allows them to efficiently transfer heat away from the components.
However, the thermal resistance of the PCB can still impact its ability to dissipate heat, especially in high-power applications.

To minimize thermal resistance, designers can use techniques such as increasing the thickness of the aluminium layer,
adding thermal vias to improve heat transfer to the other side of the PCB, and using thermal pads or heatsinks to further improve heat dissipation.

Overall, the role of aluminium PCB thermal resistance is critical in ensuring the reliable operation of electronic devices, particularly in high-power applications where heat dissipation is a significant concern.

Multilayer metal core pcb

Multilayer MCPCB could layout more circuit, the MCPCB smaller much.

This arrangement is made so that the heat can dissipate through the metal core and transmit to the chassis.

Most of the LED or analog devices are populated with considerably larger boards.
The surface of the boards finishes by dissipating the heat.

While using the MCPCBs, it is obliged to take proper caution because it is constructed with some complex and complicated metal layers laminated with FR4 based on glass material. 

The chemistry for lamination differs while the board is fabricated.
If the board is bonded properly then there might be voids below the lamination and caution is necessary.

The dissipated fixture of heat is anticipated from the metal core which is needed to be defined and designed carefully.

Applications Of aluminum pcb manufacturer

The technology of the metal core PCB is ideal for its applications that generate immense heat and have difficulty being cool down using conventional fans or other cooling methods.

MCPCBs play an integral role to achieve a high illumination with fewer requirements than LEDs require.
The fabrication process of metal core PCB is helpful for the applications
Since the MCPCBs are most often used in LED technologies for producing a certain illumination the light-emitting diodes releases the heat in applications like:

– General lighting
– Automotive systems
– Industrial, telecom, power supplies, and high voltage regulators types of power converters
– Photovoltaic
– Street safety lightings and streetlights
– Backlight applications

Military and aerospace are another two other sectors appropriate to utilize the benefits of metal core PCBs in their applications.

These sectors are quite sensitive and need to endure frequent thermal cycling, limits of temperature and humidity, along with repeated mechanical shocks.

The MCPCB deals according to the operational requirements only if better structural veracity and thermal conductivity enabling withstanding greater shocks.

The higher the conductivity of thermal, the better it is for the temperature distribution throughout the boards as it ensures a uniform for thermal cycling.

It also stops forming hot spots before near to the active components.
Other than these, MCPCB works great in solar panels and motion control applications.

The combination of a metal core with HDI PCB technology can create an advanced circuit technology including microwave RF PCB, flex PCB, and rigid-flex PCBs.

As the demand for PCBs is high due to the remarkable benefits, the metal core PCB is the most widely used one among all the others.

It ensures high circuitry density, thermal management, and enhanced reliability for enhanced performance.

Thermal conductivity of 2 Layers thermal Pad MPCB

Thermal pad area is 385 W/m.k

Capability of Metal core PCB

Metal core PCB Capability
ItemTechnical specification
Board thicknessMaximum (mm)3.05.0
Panel sizeMaximum (mm)600×1170/
Layer countAluminum PCB1-8L10 L
Copper PCB1-8L10 L
Iron PCB1/
ceramics PCB1-2/
Thermal ConductivityAluminum PCB(w/m.k)0.8 to 12
Copper PCB(w/m.k)2.0-378/
ceramics PCB(w/m.k)24
DrillingMinimum drill diameter (mm)1.00.8
2 Layer ALPCB Via0.3/
MaterialChao Shun(CCAF)(China)Yes/
Hua Dian(China)Yes/
Chin Shi(TaiWan)Yes/
ITEQ(Tai Wan)Yes/
Other brand per customerYes/
Final finishingHASL Lead FreeYes/
Immersion SilverYes/
Immersion Tin/YES

2 Layers direct thermal path copper core pcb application

2 Layers direct thermal path copper core pcb are designed to dissipate heat generated by high-power LEDs,
which helps to increase the lifespan of the LED and improve its performance.
The aluminium base acts as a heat sink, which absorbs and dissipates the heat generated by the LED.

The 2 Layers direct thermal path copper core pcb is made by laminating a thin layer of copper onto an copper substrate.
The copper layer is then etched to create the circuit pattern.
2 Layers direct thermal path copper core pcb for LED lighting applications are available in various sizes and thicknesses, depending on the specific requirements of the application.
They are also available in single-sided, double-sided, and multi-layered configurations.

About Andwin MCPCB

Andwin Ciurcuits MCPCB davision  set up on Feb. 2006.
Focus on  providing metal core PCB for customer
In LED field and power supply field.
We can meet all your MCPCB manufacturing needs,
From single-sided Aluminum to 
complex multilayered metal clad substrate PCBs
And from prototype through production.

The following is a list of the services and products 

We offer:
• Metal Core PCB
• Thermal PAD MCPCB
• Aluminum PCB
• Copper based PCB
• Double sided Aluminum PCB

Other metal core pcb your may interesting