What is COM Express?

COM Express Module Overview COM Express Logo

COM Express is a highly popular Computer-on-Module (COM) standard used in embedded computing. Designed for high-performance, scalable, and space-constrained applications, COM Express allows developers to build modular embedded systems with ease and flexibility.

What is a Computer-on-Module (COM)?

COM vs Carrier Board A typical setup: A COM plugged into a custom carrier board.

A COM is a small, self-contained computing circuit board that includes a processor, memory, and basic I/O functions. Instead of designing a full motherboard from scratch, engineers can use a COM and plug it into a carrier board, which provides custom I/O and connectors suited for a specific application.

Introduction to COM Express

Developed by PICMG (PCI Industrial Computer Manufacturers Group), COM Express defines a family of COMs that use high-speed, board-to-board connectors to interface with a custom carrier board. It supports powerful CPUs, high-speed I/O (like PCIe, USB, SATA), and is ideal for applications where space, power, and thermal efficiency matter.

Key Features

Standardized Form Factors: Multiple sizes such as Mini, Compact, Basic, and Extended.
High-Speed Interfaces: PCIe, USB 3.0, SATA, Ethernet, DisplayPort, and more.
Processor Agnostic: Supports x86 and ARM processors.
Long Lifecycle: Often used in industrial and military systems requiring long-term support.

COM Express Form Factors Different form factors of COM Express modules.

Applications of COM Express

COM Express modules are found in a wide range of industries:

Industrial automation
Medical devices
Aerospace and defense
Transportation systems
Telecommunications

By separating the computing module from the I/O carrier board, system designers can upgrade the CPU without redesigning the entire hardware system—saving time and cost.

Conclusion

COM Express is a powerful standard that simplifies embedded system design through modularity and scalability. Whether you're building a rugged industrial controller or a high-performance medical device, COM Express offers a flexible and future-ready platform.