They all have unique features, as you can see below:
1. Single-Sided Insulated Metal Substrate PCB
As the name suggests, this type of IMS PCB uses only one side, whereby the trace prints or components are mounted on one side.
Although it allows the placement of the components on one side, there are other features of the single-sided insulated metal substrate, thus:
It has a non-conducting solder mask.
The single-sided IMS PCB has the metal substrate located at the bottom side.
It also has a couple of layers, such as copper circuit layer and dielectric layer.
The metal substrate serves as the heatsink.
The metal base contains both aluminum and alloy.
2. Double-Sided IMS PCB
This is the opposite of the single-sided insulated metal substrate, in the sense that both sides are used. The double-sided insulated metal substrate circuit board comprises two solder masks (trace prints), which are populated or located on both sides of the circuit board.
The following makes up the structure of the double-sided insulated metal substrate circuit board:
The base material is made of any of the following: iron alloy, copper or aluminum.
The metal substrate is located in the middle.
The insulation of the current-carrying vias is up to the resin material, which is applied around the vias.
Double-sided IMS PCBs have a via, which is used to facilitate the conduction or transfer of current and heat.
3. Multilayered Insulate Metal Substrate PCBs
This is one of the most complex forms of the insulated metal substrate circuit board. In addition to the complex, it requires multiple layers for the configuration.
Here are some of the attributes of the multilayered insulate metal substrate circuit boards:
Multiple or several copper layers are sandwiched or joined at the bottom and top sides of the substrate.
Examples of the materials used for the multilayered IMS PCB are iron alloy, copper and aluminum. Those are mostly used for the base layer.
It supports more component usage, as well as enables the dual-side mounting of components.
The major downside to working with a multilayered insulated metal substrate circuit board is that design is quite complex. This can be attributed to the overall support for complex circuit board designs, such as the Single-Board Computers (SBCs).
However, it makes use for that complexity with the delegation of the metalcore to act as a heat conductor for facilitating the speed of circulating heat away from the board.
4. Aluminum IMS PCBs
This is a type of insulated metal substrate circuit board that has aluminum as the primary material. The properties include moderate electrical properties and thermal conductivity capabilities.
5. Copper Metal IMS PCBs
These have copper as the substrate material. The capabilities include excellent electrical conductivity and thermal conductivity.
As much as copper insulated metal substrate circuit boards can be delegated for a wide range of applications, they have one major downside. They are quite expensive and sometimes, can be overly-exposed to faster corrosion.
6. Stainless Steel Insulated Metal Substrates
These are one of the materials used for IMS PCB designs. The upsides to stainless steel material-usage for these circuit boards are affordability and improved mechanical strength.
However, you will find out that the material, when compared to the likes of copper and aluminum, doesn’t measure up, in terms of electrical and thermal performance.
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