A 3.5-inch single board computer (SBC) is a compact, standardized form factor motherboard designed for embedded and industrial applications. Measuring approximately 146mm x 102mm, it offers a balance between the ultra-compact size of smaller SBCs and the expanded I/O capabilities of larger boards. These boards are engineered for reliability, low power consumption, and long-term availability, making them ideal for integration into custom enclosures and dedicated systems.
Key specifications for 3.5-inch SBCs typically include a soldered, low-power processor (from Intel, AMD, or ARM architectures), onboard memory (RAM and eMMC storage), and a rich set of I/O ports directly on the board. Common features include multiple Gigabit Ethernet ports, USB 2.0/3.0, HDMI/DisplayPort outputs, SATA connectors for storage expansion, and GPIO headers for sensor and device interfacing. Their fanless, solid-state design ensures silent operation and high durability in challenging environments.
The primary use cases for 3.5-inch SBCs are in embedded systems where space, power efficiency, and reliability are paramount. They are extensively used in:
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Digital Signage & Kiosks: Powering interactive displays and information terminals.
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Industrial Automation: Serving as controllers for PLCs, HMIs, and machine vision systems.
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IoT Gateways: Aggregating and processing data from edge sensors and devices.
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Thin Clients & POS Systems: Providing the computing core for secure, centralized environments.
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Transportation & In-Vehicle Computing: Used in fleet management and passenger infotainment.
When selecting a 3.5-inch SBC, it's important to compare core components. The table below outlines common configurations:
| Feature | Entry-Level / IoT Focus | Mid-Range / General Purpose | High-Performance / Industrial |
|---|---|---|---|
| Processor | ARM Cortex-A Series (e.g., A53, A55) | Intel Celeron / Atom / N-Series (e.g., N100) | Intel Core i3/i5/i7 (U-Series, P-Series) |
| Memory | 2-4GB LPDDR4 (onboard) | 4-8GB DDR4 | 8-32GB DDR4/DDR5 |
| Storage | 16-64GB eMMC | 64-256GB eMMC / SATA SSD | 256GB+ NVMe SSD + SATA |
| I/O Typical | 1-2x GbE, USB 3.0, HDMI, GPIO | 2x GbE, multiple USB, dual display, M.2 | 2-4x GbE, USB 3.2/Type-C, multiple displays, PCIe |
| OS Support | Embedded Linux (Yocto, Ubuntu Core) | Linux, Windows 10/11 IoT | Windows 10/11 Pro, Linux |
Thinvent's Compact Computing Solutions for Embedded Applications
While Thinvent specializes in fully assembled industrial computers and mini PCs, our product philosophy aligns perfectly with the demands of 3.5-inch SBC users: compact size, fanless reliability, and robust performance. Our solutions, such as the Thinvent Micro Series and Treo Mini PC, offer pre-integrated systems that deliver similar benefits. For instance, our ARM-based Micro thin clients provide ultra-low-power, fanless operation with onboard memory and storage, ideal for lightweight embedded tasks and digital signage. For more demanding applications, our Intel-based Treo and Aero mini PCs, featuring efficient processors like the Intel N100 and Core i3-1215U, offer greater computational power in a similarly small footprint, pre-configured with operating systems like Thinux™ Embedded Linux or Windows IoT. These ready-to-deploy systems eliminate integration hassles while providing the durability and long-term support required for professional embedded deployments worldwide.
