When it comes to PCB design and manufacturing, confusion may sometimes arise, especially when discussing double-sided PCB and double-layer PCB. Although these two types of PCBs may sound similar, they actually have fundamental differences, particularly in the case of Metal Core PCB. In this article, we will explore how to distinguish between double-sided PCB and double-layer PCB, as well as their applications in PCB design and manufacturing.
Double-sided PCB VS. Double-layer PCB
First, let's clarify the difference between double-sided PCBs and double-layer PCBs. While in conventional FR4 PCBs, these two terms might be considered synonymous, but in the case of MCPCBs, they do represent distinct concepts.
Double-sided PCB
- Double-sided MCPCB means there is a metal core in the middle, with a layer of copper on each side on the top and bottom, separated by a dielectric layer.
- In a double-sided PCB, the metal core (typically aluminum or copper) is sandwiched between copper foils, used for heat dissipation or as a ground layer.
Double-Side MCPCB Structure
Double-layer PCB
- Double-layer MCPCB means there is a metal core at the bottom, with a 2-layer FR4 PCB on top, separated by a dielectric layer between the FR4 PCB and the metal core.
- In a double-layer PCB, the metal core is typically located at the bottom of the PCB, while the FR4 PCB is positioned on top.
Double-Layer MCPCB Structure
How to Distinguish Between Double-sided MCPCB and Double-layer MCPCB?
While double-sided PCBs and double-layer PCBs may appear very similar in FR4 PCBs, they have distinct differences in MCPCBs. To differentiate them, you can focus on the following aspects:
- Stack-up structure: Check the PCB's stack-up structure. If there is a metal core in the middle of the PCB, with a layer of copper foil on the top and bottom, it is a double-sided MCPCB. Whereas if the metal core is at the bottom, and there are 2 layers of regular FR4 PCB on the top, it's a double-layer MCPCB.
- Interlayer connection: Examine how the layers are interconnected internally. In double-sided MCPCBs, the top and bottom copper foils are typically connected through holes or other means. In double-layer MCPCBs, there is usually a dielectric layer between the metal core and the top FR4 layer.
- Application scenarios: Consider the intended use of the PCB. Double-sided MCPCBs are often used in applications requiring both heat dissipation and electrical connections, while double-layer MCPCBs are suitable for applications requiring more circuit layers.
Although double-sided PCBs and double-layer PCBs may sound similar in name, they represent different structures and purposes when it comes to metal core boards (MCPCBs). By understanding the distinctions between them, you can better select the PCB type that suits your project requirements and ensure the success of your design and manufacturing processes.
