IMS, Insulated Metal Substratemetal substrate (IMS) PCBs, with variants and names including Aluminiumaluminium base, MCPCBmetal clad printed circuit board (Metal Clad Printed Circuit BoardMCPCB) and Thermally Conductivethermally conductive PCBs have some sought-after features in terms of heat conduction and mechanical stability. However, whatWhat I'm looking for are lesser known drawbacks. To start off, I'd mention the ones I already know:
- Costly.
- In basic configuration only suitable for single sided SMT.
- Even more costly and complex if more than one layer is needed.
- Mechanical disadvantages in some settings including vibrations.
- In basic configuration usually have quite thick copper: 3oz, although thinner copper is possible.