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K3921-H mSTX – Extended Lifecycle Fanless Motherboard by Kontron

The Kontron K3921-H mSTX is a compact Mini-STX extended lifecycle industrial motherboard based on Intel Core i3 and Intel Processor N-Series (Alder Lake N, Twin Lake) SoCs, designed for fanless 24/7 continuous operation. DDR5-4800 memory up to 32 GB, up to three independent displays via dual DisplayPort 1.4a and USB Type-C alternate mode, eDP V1.4b, onboard TPM 2.0, and a dual-range DC input from 12 V to 28 V make it ideal for thin client, kiosk, and compact embedded computing applications requiring a long product lifecycle. Available from Recab, your Nordic partner for Kontron embedded motherboard solutions.

manufacturer

Kontron

product model

K3921-H mSTX
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CE Class B, cTÜVus Certified, FCC Class B, IEC 62368-1

Overview

The Kontron K3921-H mSTX is an extended lifecycle industrial motherboard in the compact Mini-STX form factor at 140 x 148 mm, built around the Intel Alder Lake N and Twin Lake SoC platform. Processor options range from the quad-core Intel Processor N100 and N150 at 6 W TDP to the octa-core Intel Core i3 N305 and Core 3 N355 at 15 W TDP, with Kontron’s cTDP feature allowing flexible TDP reduction down to 6 W for fanless thermal designs. A single DDR5-4800 SO-DIMM socket accommodates up to 32 GB of non-ECC memory. Intel UHD Gen12 graphics with Xe architecture drives up to three independent displays: two DisplayPort 1.4a rear outputs, one DisplayPort via USB Type-C front alternate mode, and one embedded DisplayPort V1.4b onboard for direct panel integration at up to 4K resolution. Storage is handled by one M.2 Key-M slot supporting PCIe x1 Gen3 NVMe and SATA SSDs, one M.2 Key-E 2230 slot for WLAN and Bluetooth modules with PCIe and CNVi support, and one SATA 6G port. Intel integrated TPM V2.0, an onboard hardware watchdog, and one RS-232 header provide platform security and serial device connectivity. The dual-range DC input accepts 12 V or 19–28 V externally, with an additional USB-C PowerDelivery sink at 20 V up to 100 W for flexible system integration. Certified to cTÜVus IEC62368-1, CE Class B, UKCA, and FCC-B, and designed for 24/7 operation from 0 to 50 degrees Celsius, the K3921-H is at home in thin client, kiosk, medical terminal, and embedded industrial PC applications. Available from Recab, your Nordic partner for Kontron embedded motherboard solutions.
Flexible, High Performance, Multiple Displays, NVMe Storage, TPM 2.0

Key highlights

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Features

  • Intel Alder Lake N and Twin Lake SoC options deliver scalable performance with TDP flexibly configurable down to 6 W.
  • DDR5-4800 SO-DIMM supports up to 32 GB of memory for efficient multi-application embedded workloads.
  • Up to three independent displays at up to 4K are supported via dual DisplayPort 1.4a and USB Type-C alternate mode.
  • Onboard eDP V1.4b connector enables direct integration of embedded display panels without additional conversion hardware.
  • Dual-range DC input of 12 V or 19–28 V plus USB-C PowerDelivery sink at 20 V allows flexible power supply integration.
  • Intel integrated TPM V2.0, hardware watchdog, and IEC62368-1 safety certification ensure secure and reliable 24/7 operation.

Specifications

Processor Intel® Alder Lake N/Twin Lake SoC
Memory DDR5 4800 SDRAM, max 32 GByte
Graphics Intel® UHD Graphics Gen12
Ethernet Realtek RTL8111H
USB 8x USB ports total
SATA 1x SATA III 600 Interface
Power 12V or 19-28V DC Input
Dimensions 5.5" x 5.8" (140 x 148 mm)
Temperature 0 °C to 50 °C Operating
Certifications cTÜVus, CE Class B, FCC-B

Applications

  • Fanless thin client and kiosk computing requiring extended product lifecycle and low-power SoC performance
  • Compact embedded industrial PC in space-constrained control panel and DIN-rail enclosure installations
  • Medical terminal and bedside display systems requiring certified 24/7 continuous fanless operation
  • Digital signage and multi-display edge computing with up to three independent 4K display outputs

Resources

Datasheet

https://recab.com/wp-content/uploads/2025/10/intel-core-i3-processors-intel-processor-series-datasheet-1.pdf

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