3.5" Single Board Computer with ARM® Cortex®-A72 + Cortex®-A53 based Processor, Rockchip RK3399(K)
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  • 1x eDP, 1x LVDS, 1x DP, 1x HDMI 2.0 for dual display support
  • 2x GbE LAN, Wi-Fi, Bluetooth for wired & wireless network connection
  • 2x USB 3.2 Gen 1, 3x USB 2.0, 1x USB 2.0 OTG, 2x RS232 (Tx/Rx) for peripheral connection
  • 8x GPIO for device / signal control
  • eMMC, 1x Micro SD Cage, 1x mPCIe, 1x M.2 Key B, 1x M.2 Key E for storage & expansion
Download Datasheet

High-performance & Budget-friendly

A High-performance & High-efficiency Platform For 4K UHD Streaming

3.5"-SBC-R39 is a 3.5″ single board computer powered by Rockchip RK3399(K) processor based on ARM® big.LITTLE architecture with ARM® Cortex®-A72 (big) and Cortex®-A53 (LITTLE). The "big" Cortex®-A72 core is designed to execute high-performance tasks while the "LITTLE" Cortex®-A53 core is designed for high-efficiency tasks. Based on this hybrid architecture, 3.5"-SBC-R39 can automatically handle the allocation of tasks to the appropriate cores according to the performance required. In addition, with 4K Ultra HD video decode capabilities as well as DP and HDMI 2.0 output interfaces, it delivers optimized performance in 4K Ultra HD streaming at 60 fps with the lowest power.

Ideal For Fanless & Budget-conscious System Integration

3.5"-SBC-R39 is an ideal platform for integration into a fanless system used in budget-conscious consumer, commercial or industrial applications, such as home entertainment, digital signage, kiosk, smart office, smart surveillance and industrial control.


Processor Rockchip RK3399
(64-bit Dual Core ARM® Cortex®-A72 + Quad Core Cortex®-A53 up to 1.8 GHz)
Rockchip RK3399K
(64-bit Dual Core ARM® Cortex®-A72 + Quad Core Cortex®-A53 up to 2.0 GHz)
Main Memory 2 GByte / 4 GByte LPDDR4 memory down
Graphics Mali-T864
Display 1x eDP (4096 x 2160 @ 60 Hz)
1x LVDS (24-bit, 2-ch, 1920 x 1200 @ 60 Hz)
1x DP (4096 x 2160 @ 60 Hz, on front)
1x HDMI 2.0 (4096 x 2160 @ 60 Hz, on front)
Dual display support
Audio Controller Realtek ALC5651
Audio 2x Speaker-out (3 W, by header)
1x Line-out (by header)
1x Line-in (by header)
1x Mic-in (by header)
Ethernet 2x GbE LAN (RJ45 on front, 1x Realtek RTL8211F, 1x Realtek RTL8153B)
Wireless connectivity Wi-Fi + Bluetooth (AMPAK AP6236)
USB 2x USB 3.2 Gen 1 (Type A on front)
3x USB 2.0 (1x Type A on front, 2x by header)
1x USB 2.0 OTG (Type A on front)
Serial 2x RS232 with Tx / Rx (by header)
Available I/Os 8x GPIO (by header)
Storage 16 GByte / 32 GByte eMMC (onboard)
1x Micro SD Cage (onboard)
Expansion 1x mPCIe (Full size, mixed w/ PCIe x1 / USB 2.0)
1x M.2 Key B (Type 3042, mixed w/ USB 3.0)
1x M.2 Key E (Type 2230, mixed w/ PCIe x1 / USB 2.0)
1x SIM Card Cage (Micro type, connected to M.2 Key B)
Input Voltage DC 13 V ~ 30 V (Configuration 1)
DC 12 V (Configuration 2)
Power connector 3-pin pitch 3.5 mm Terminal Block (on rear, Configuration 1)
1x4-pin pitch 3.0 mm Wafer (on rear, Configuration 2)
Watchdog Power on / off management & Watcdog Timer support (ST STM8S103 MCU)
Real Time Clock I2C RTC Chip onboard (HAOYU HYM8563)
Security Microchip ATSHA204A CryptoAuthentication
Frontpanel 1x Header for Power Switch, User-defined Switch & 2x User-defined LED
Cooling 1x Wafer for Smart Fan
Operating System Linux, Android
Dimension (H x W) ECX (146 mm x 105 mm / 5.75" x 4.13")
Operation Temperature 0 °C ~ 60 °C / 32 °F ~ 140 °F
Humidity 0 % ~ 95 %
Compliance CE Class A, FCC Class A



3.5"-SBC-R39 Datasheet
Revision 20240312, March 12, 2024
[ 3d5-sbc-r39-datasheet-20240312.pdf, 2.19 MB, Mar.12.2024 ]


General Safety Instruction
[ general-safety-instructions.pdf, 560.72 KB, Jan.04.2021 ]

Tech Spec Sheet

Tech Specs SBC (Release Candidate) 
Revision 20240711, July 11, 2024
[ 3d5-sbc-tech-spec-sheet-20240711.pdf, 19.82 MB, Jul.11.2024 ]


Kontron Services Brochure
[ kontron-services-brochure.pdf, 8.9 MB, Dec.17.2020 ]


3.5\ Rockchip RK3399, 4 GByte LPDDR4 memory down, 16 GByte eMMC, DC 13 V ~ 30 V input  
3.5\ Rockchip RK3399K, 4 GByte LPDDR4 memory down, 16 GByte eMMC, DC 13 V ~ 30 V input  


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