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Aluminum substrate is a unique metal based copper clad laminate with good thermal conductivity, electrical insulation and machining properties Here is the knowledge about the PCB aluminum substrate sheet.

1. Advantages of PCB aluminum substrate

(1) Surface mount technology (SMT) is adopted;
(2) In the circuit design scheme, the heat diffusion is treated very effectively;
(3) Reduce product operating temperature, improve product power density and reliability, and prolong product service life;
(4) Reduce product volume and reduce hardware and assembly costs;
(5) Replace the fragile ceramic substrate to obtain better mechanical durability.

2. Structure of PCB aluminum substrate

Aluminum based copper clad laminate is a metal circuit board material, which is composed of copper foil, thermal insulation layer and metal substrate.

(1) Copper foil

Copper clad laminate equivalent to ordinary PCB. The thickness of circuit copper foil is 1oz to 10 oz.
The circuit layer (i.e. copper foil) is etched to form a printed circuit to connect the various components of the element. Generally, it is required to have a large current carrying capacity, so a thicker copper foil is used, with a thickness of 35μm~280μm；

(2) Thermal insulation layer

The insulation layer is a layer of low thermal resistance thermal insulation material.
Thermal conductive insulating layer is the core of aluminum substrate. It is generally composed of special polymers filled with special ceramics. It has small thermal resistance, excellent viscoelastic performance, anti-thermal aging ability and can withstand mechanical and thermal stress.

(3) Metal substrate

Generally aluminum based copper clad laminate and traditional epoxy glass cloth laminate.
The metal base is the supporting component of aluminum substrate, which has high thermal conductivity. It is generally aluminum plate or copper plate, which is suitable for conventional machining such as drilling, punching, shearing and cutting.

3. Purpose of PCB aluminum substrate

(1) Audio equipment: input and output amplifiers, balance amplifiers, audio amplifiers, preamplifiers, power amplifiers, etc.
(2) Power supply equipment: switch regulator, DC / AC converter, SW regulator, etc.
(3) Communication electronic equipment: high frequency amplifier, filter appliance, transmitting circuit.
(4) Office automation equipment: motor driver, etc.
(5) Automobile: electronic regulator, igniter, power controller, etc.
(6) Computer: CPU board, floppy disk drive, power supply device, etc.
(7) Power module: converter, solid state relay, rectifier bridge, etc.