What is a PC/104 Backplane?
A PC/104 backplane is a passive board that provides a standardized, modular, and stackable interconnection system for PC/104 form factor modules. It serves as the central "spine" of an embedded system, allowing multiple single-board computers (SBCs), I/O modules, and expansion cards to be connected via the PC/104 bus. This architecture is defined by the PC/104 Consortium and is renowned for its compact size (3.550" x 3.775"), ruggedness, and use of a reliable pin-and-socket connector stack-through method, eliminating the need for a traditional motherboard and card cage.
Key Specifications and Technical Details
The core of a PC/104 system is its 104-pin ISA (PC/104) or 120-pin PCI (PC/104-Plus) bus interface, which is carried through the stack via the backplane. Key technical aspects include:
-
Form Factor: Strict adherence to the 3.6" x 3.8" board size.
-
Stackability: Modules stack vertically, connected by male/female headers on each board, creating a highly compact and vibration-resistant system.
-
Bus Standards: Supports ISA (PC/104), PCI (PC/104-Plus), and PCIe/104 for modern high-speed peripherals.
-
Power: Typically supplied through the backplane connector, often at +5V, with support for additional voltages.
-
Rugged Design: Designed for extended temperature ranges and high shock/vibration environments, making them ideal for industrial use.
Applications and Use Cases
PC/104 backplane systems are the foundation for countless embedded and industrial applications where reliability, compact size, and modularity are paramount. Common use cases include:
-
Industrial Automation & Control: Machine control, PLCs, and robotics.
-
Transportation Systems: Railway controls, avionics, and automotive telematics.
-
Medical Devices: Patient monitoring and diagnostic equipment.
-
Military & Aerospace: Ruggedized computing for field-deployed and vehicle-mounted systems.
-
Digital Signage & Kiosks: Compact media players and interactive displays.
PC/104 Backplane vs. Traditional Systems
| Feature | PC/104 Backplane System | Traditional Desktop/Motherboard |
|---|---|---|
| Form Factor | Extremely compact, stackable (3.6" x 3.8") | Large, fixed layout (ATX, micro-ATX) |
| Expansion | Modular, stackable modules | PCI/PCIe slots on a motherboard |
| Ruggedness | High (resists shock/vibration, wide temp) | Low (designed for benign environments) |
| Customization | High (mix-and-match SBCs & I/O cards) | Limited to available slots and ports |
| Typical Use | Embedded, industrial, mobile applications | Office, consumer, and gaming PCs |
Thinvent Products Featuring PC/104 Compatibility
While Thinvent specializes in robust, fanless industrial computers and mini PCs, our engineering expertise aligns with the core principles of the PC/104 standard: reliability, compact design, and industrial durability. For applications requiring a more integrated, out-of-the-box solution with similar ruggedness and small form factor, Thinvent's range of Industrial PCs and Mini PCs offer excellent alternatives. These systems provide pre-configured computing power with wide-temperature operation, fanless cooling, and rich I/O—delivering turnkey reliability for demanding environments without the need for module stacking. Explore our product lines for compact, powerful computing solutions built for industrial longevity.
