Kontron K3921-H6 mini-STX Intel processor I3-N305 15W TDP

Embedded developers and system integrators building compact industrial PCs, digital signage players, or edge gateways will find the Kontron K3921-H6 a reliable foundation. This mini-STX board pairs an Intel Core i3-N305 processor with dual 2.5 Gigabit Ethernet and flexible expansion, all within a footprint smaller than Mini-ITX.

Key specifications

• Intel Core i3-N305 (8 cores, 8 threads, up to 3.8 GHz, 15W TDP)
• 2x DDR4 SO-DIMM slots, up to 32 GB at 3200 MHz
• 1x HDMI 2.0b, 1x DisplayPort 1.4a, 1x eDP 1.4b
• 2x 2.5 Gigabit Ethernet (Intel I226-V)
• 1x M.2 2280 (PCIe Gen3 x4 / SATA), 1x M.2 2230 (PCIe / USB for Wi-Fi/BT)
• 1x SATA III, 2x USB 3.2 Gen2 Type-A (rear), 2x USB 3.2 Gen1, 2x USB 2.0 (internal)
• 1x RS232/422/485 internal header, Realtek ALC671 audio
• 12V–24V DC input, operating temperature 0°C to 60°C

Why choose it

The K3921-H6 delivers efficient multi-core performance with a 15W TDP, enabling fanless designs in constrained spaces. Dual 2.5GbE ports provide high-speed networking for data-intensive edge applications, while the dual M.2 slots support fast NVMe storage and wireless connectivity. The wide voltage input and industrial temperature range ensure dependable operation in challenging environments.

Ideal use cases

• Fanless industrial PCs and HMI terminals
• Digital signage and kiosk systems
• Edge computing and IoT gateways
• Network appliances and security devices

Good to know

This board uses the mini-STX form factor (5.5" x 5.8"), which is not compatible with standard Mini-ITX cases. A suitable chassis and DC power supply are required. The processor's integrated Intel UHD Graphics supports 4K output on HDMI and DisplayPort. The M.2 2230 slot can accommodate a Wi-Fi/BT module, but no module is included.