KSJ

What KSJ does

KSJ Co., Ltd. (株式会社ケイエスジェイ) is a Tokyo-headquartered private embedded systems company founded in 1986, specializing in FPGA-based industrial communication and motion control products. Its core technology stack comprises proprietary EtherCAT master and slave implementations running entirely on FPGAs (Xilinx Zynq and Kria SoM platforms), enabling sub-10 μsec cycle times and sub-50 nsec jitter — performance levels the company describes as globally rare. Product lines include EtherCAT master boards and modules (LZ202, EMM, Bridge Controller), CC-Link IE TSN managers (CMM, RB100-integrated), DC brushless servo motor drivers (Inros and Kyros series, with patent No. 7376001 on the Kyros EMC structure), and integrated robot controller platforms (RB100, UZ100) that combine ROS2 on Ubuntu 22.04 with FreeRTOS real-time OS on a single SoC, alongside hybrid FPGA/OpenCV image processing.

The company's revenue model combines direct sales of proprietary hardware products (boards, modules) with custom OEM/ODM development services covering the full lifecycle from specification design through firmware, FPGA logic, and PC software to mass production of electronic circuit boards. Pricing is not public; all transactions are direct inquiry. Manufacturing is vertically integrated through KSJM Electronics (100% subsidiary in Nilai, Malaysia) handling board assembly and Yokkaichi handling final inspection under ISO 9001:2015 certification. KITY LLC (Mongolia) provides offshore software development capacity. KSJ serves enterprise customers across semiconductor manufacturing equipment, factory automation, robotics system developers, transportation infrastructure, and research institutions, with named clients including SPring-8 and major Japanese industrial OEMs (PHC, CKD, Sodic, Nikon, Nidec Sankyo, Nishimatsu Construction, Kuwana Metal Group). Nippon Pulse Motor holds a 33.4% equity stake from a 2021 capital tie-up and provides distribution leverage for the CC-Link IE TSN stepping motor driver.

Name

KSJ

Legal name

株式会社ケイエスジェイ

Website

https://t-ksj.co.jp

Company type

Private

Founded year

1986

Operating status

Operating

Headcount range

11–50 employees

Short description

KSJ is a Tokyo-based private embedded systems company developing proprietary FPGA-based EtherCAT stacks, CC-Link IE TSN managers, DC brushless servo motor drivers, and ROS2-integrated robot controllers for industrial OEM customers in semiconductor equipment, factory automation, and robotics sectors.

Ownership category

akta.pro rank

Product category

Industrial Electronics / Embedded Control Systems

NAICS

Relay and Industrial Control Manufacturing (335314)

SIC

Industrial Instruments For Measurement, Display, And Control (3823), Electrical Industrial Apparatus (3620)

akta.pro primary industry

Industrial Controllers & Control Systems (PLCs, PACs, CNC Controllers) (IMAHAHAH)

akta.pro secondary industries

Motor Drive & Motion Control Electronics Manufacturing Services (VFDs, servo drives, controllers) (IMAGAGAJ), Motor Encoders, Feedback & Condition Monitoring (Encoders, Vibration, Predictive) (IMAGACAJ), Industrial Control Panels & Enclosures (Panel Building, MCCs, Integration) (IMAGABAJ)

Keywords

• Industrial communication systems
• FPGA-based motion control
• Embedded electronics manufacturing
• EtherCAT master controllers
• ROS2 robotics platforms

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Infrastructure, Marketing or Sales

Revenue model

1. Custom Electronic Board Development & Manufacturing (OEM/ODM): Full-lifecycle custom development from specification design through firmware, FPGA logic, and PC software to mass production of electronic circuit boards for industrial applications. Includes relay circuit design, PLC ladder software development, and control panel design/manufacturing. Revenue from B2B contract development and manufacturing.
2. Industrial Communication Products (EtherCAT, CC-Link IE TSN): Sale of proprietary FPGA-based EtherCAT master and slave boards (LZ202, RB100, EMM, Bridge Controller) and CC-Link IE TSN manager modules (RB100, CMM). Products include bundled software stacks, configuration tools, and SDKs. Customers purchase boards with integrated IP.
3. Servo Motor Driver Products: DC brushless servo motor drivers (Inros series, Kyros series) sold as off-the-shelf or semi-custom products. Revenue from direct board sales with bundled auto-tuning software tools. Target semiconductor manufacturing, robotics, and FA equipment makers.
4. EMS (Electronics Manufacturing Services): Board assembly and manufacturing services primarily for in-house developed products. Includes parts procurement, SMT mounting, reflow, inspection, and quality control. Malaysia subsidiary (KSJM ELECTRONICS) handles mass production; Yokkaichi facility handles final inspection and quality assurance.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels5 records

Core offering

KSJ designs, develops, and manufactures FPGA-based industrial communication boards (EtherCAT master/slave, CC-Link IE TSN), DC brushless servo motor drivers, and ROS2-integrated robotics controllers for industrial equipment manufacturers, robot developers, and FA machinery makers. The company provides full-lifecycle custom electronic board development from specification design through firmware, FPGA logic, and PC software to mass production, supported by its own manufacturing subsidiary in Malaysia and ISO 9001:2015-certified quality inspection in Yokkaichi, Japan.

Product overview

KSJ (株式会社ケイエスジェイ) is a technology company specializing in embedded control systems and industrial electronics with over 30 years of experience. The product portfolio centers on three interconnected technology pillars: (1) Industrial communication protocols including proprietary FPGA-based EtherCAT Master/Slave stacks and CC-Link IE TSN Manager; (2) Motion control products including brushless DC servo motor drivers (Inros/Kyros series) with built-in EtherCAT interfaces; and (3) Robotics platforms (RB100, UZ100) integrating ROS2, EtherCAT, and image processing on Xilinx Zynq UltraScale+ MPSoC. Products are available as development/evaluation boards or as modules (EMM, CMM) for customer board integration. The company also provides custom development services and operates its own manufacturing facilities for high-reliability industrial board production.

Differentiator

Problem solved

Functional benefit

Brands

• Inros Series: Brushless DC servo motor driver product line with common electrical circuits and software, varying in board shape and connector type.
• Kyros Series
• UZ100
• RB100
• LZ202
• EMM (EtherCAT Master Module)
• CMM (CC-Link IE TSN Manager Module)

Products and services

• EtherCAT Master Stack / Boards (LZ202, RB100, UZ100, EMM) FPGA-based EtherCAT Master communication system with proprietary master stack. Achieves cycle times as fast as 8 μsec (32-bit PDO × 1 slave) or 40 μsec (40-byte PDO × 5 slaves) with jitter under 50 nsec. Supports ETG.1500 Class B, DC synchronization, FoE, and cable redundancy. Available as development boards (LZ202, RB100, UZ100) or as EMM module for integration into customer boards. Targeted at industrial equipment manufacturers, robot developers, and FA machinery makers.
• EtherCAT Slave (LZ202s, ECAT-SM, Standard Interface Board) FPGA-based and ESC-based EtherCAT Slave solutions. LZ202s and ECAT-SM use Beckhoff ESC IP core with KSJ slave stack for high-speed motion control. Standard Interface Board uses Infineon XMC4800 with 60 μsec cycle communication. Supports CiA402 motion profiles. For industrial equipment manufacturers building multi-axis EtherCAT systems.
• Bridge Controller (EtherCAT Branch Controller) Dual FPGA stack product implementing both EtherCAT master and slave in single FPGA. Functions as slave to upstream EtherCAT line and master to downstream EtherCAT line, enabling two-layer network topology with flexible slave count management. Achieves time synchronization across all devices on both EtherCAT lines. For industrial system integrators building distributed multi-segment EtherCAT networks.
• DC Brushless Servo Motor Drivers (Inros / Kyros Series) FPGA-based brushless DC servo motor drivers achieving 25 μsec (40kHz) control cycles for current, speed, and position feedback. Two form factors: Inros (135×85×30mm) for mass-production and general use; Kyros (65×40×37.15mm) for embedded applications. Supports EtherCAT communication with 100 μsec minimum cycle and CiA402 profiles (CST, CSV, CSP, PP, Homing modes). Includes auto-tuning tool with frequency response analysis.
• RB100 Robot Controller (ROS2/EtherCAT) Current-generation robot development platform integrating full desktop ROS2 (Ubuntu 22.04) with industrial real-time communication. Xilinx Kria SoM K26 (ARM Cortex A53×4 + R5F×2 + 256K FPGA logic). Runs FreeRTOS and Ubuntu simultaneously for real-time and application processing. Supports EtherCAT Master, CC-Link IE TSN, USB3.0 cameras, and OpenCV. Size 162×112mm. Targeted at robot developers and system integrators building ROS2-based robotic systems.
• CC-Link IE TSN Manager (RB100, CMM) CC-Link IE TSN Manager implementing TSN technology via AMD Xilinx TSN IP core with FreeRTOS driver. Achieves 30 nsec time synchronization (IEEE 802.1AS compliant) and supports IEEE 802.1Qbv time-division scheduling. Available as RB100 board with integrated manager or as CMM module for customer board integration with 1.6 Gbps DPRAM interface. For industrial network infrastructure providers and TSN adopters.
• Image Processing System (FPGA + OpenCV) Hybrid image processing solution combining FPGA-based real-time processing with Linux OpenCV library. Runs on UZ100 board with Xilinx Zynq UltraScale+ MPSoC. FPGA processing executes in under 20 msec for filtering and pattern matching with no timing variation. Supports 3D imaging via structured light and phase shift method. Includes FPGA image processing libraries (Vitis Vision) and software libraries (OpenCV). For robot developers needing vision-guided control and 3D imaging applications.
• EMS Manufacturing Services Electronics manufacturing services including board assembly, inspection, and quality control. Manufacturing facilities in Malaysia (KSJM ELECTRONICS SDN BHD) and inspection at Yokkaichi, Japan. Specializes in high-reliability industrial boards with automatic electrical inspection, barcode traceability, and ISO 9001:2015 quality management. Provided to industrial equipment OEMs requiring in-house manufacturing for quality control.
• Custom Development Services Custom embedded system development from specification to mass production. Capabilities include circuit design (microprocessor/FPGA, analog, high-speed PCIe/DDR4/imaging), FPGA logic design, firmware development, PLC ladder software, and control panel design. Supports development from prototype to high-volume production. For industrial equipment OEMs needing custom control solutions.
• UZ100 Evaluation Board (Robot Control) Previous-generation evaluation platform for ROS2, EtherCAT, and image processing integration. AMD Xilinx Zynq UltraScale+ MPSoC (XCZU3EG). ROS2 framework pre-implemented with independent ROS2 CPU and EtherCAT CPU. Used for development platform evaluation; succeeded by RB100. For robot developers and R&D teams evaluating integrated ROS2 + EtherCAT platforms.

Quantifiable outcome

• EtherCAT cycle time: 8 μsec for 1 slave (32-bit PDO), 40 μsec for 5 slaves (40-byte PDO), 100 μsec for 32 slaves (16-byte PDO)
• +5 more outcomes

Named customers7 records

Segments6 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability2 records

Feature8 records

Partnerships

Three partnerships are on record, tiered core and supporting.

• KSJM ELECTRONICS SDN BHDcoreOthers100% owned manufacturing subsidiary established in 2012 in Nilai, Malaysia. Handles all in-house board assembly and mass production for KSJ products. Enables vertically integrated manufacturing from design through production with full quality control.
• KITY LLCsupportingOthersSoftware development subsidiary based in Darkhan, Mongolia. 3 software engineers currently employed. Supports KSJ software development capacity, particularly for ROS and embedded software projects.
• AMD Xilinx (Kria SoM Ecosystem)coreTechnology or IntegrationKSJ's RB100 and UZ100 boards are built on AMD Xilinx Kria SoM K26 and Zynq UltraScale+ MPSoC platforms respectively. KSJ leverages Xilinx/AMD's FPGA SoC ecosystem, development tools (Vitis, Vivado), and IP cores (including TSN IP) as the foundation for its EtherCAT, TSN, and ROS2 products.

Scale indicators7 records

Recent moves10 records

Expansion highlights6 records

Broad incumbents

• Yaskawa Electric: Major Japanese manufacturer of servo motors, drives, and industrial robots (Motoman), with strong EtherCAT-compatible products. Comparable as a Japanese motion control incumbent that competes with KSJ's servo motor drivers, but operates at much larger scale with a full robotics portfolio.
• Mitsubishi Electric (Factory Automation): Japanese industrial automation giant offering PLCs, servo drives, robots, and CNCs with CC-Link IE TSN and EtherCAT-compatible products. Comparable as a broad portfolio incumbent in the same Japanese FA market KSJ serves, especially for TSN-related products where Mitsubishi is a key CC-Link IE TSN promoter.
• OMRON Corporation: Japanese industrial automation leader offering PLCs, servo systems, sensors, and safety products with EtherCAT support. Comparable as a broad FA incumbent targeting similar Japanese equipment builders, though OMRON's portfolio spans much wider industrial component categories.
• Analog Devices (formerly Maxim Integrated): Major semiconductor and motion control company (following Maxim's acquisition of TRINAMIC) supplying industrial Ethernet PHYs, motor driver ICs, and TSN-capable processors. Comparable to KSJ as a supplier of foundational silicon for industrial communication and motor control, though at much broader scope and scale.
• Renesas Electronics: Japanese semiconductor manufacturer with industrial Ethernet solutions (EtherCAT, TSN-capable MCUs and ASSPs) used in motor control and FA applications. Comparable as a chip-level supplier enabling the same EtherCAT/TSN equipment market KSJ serves, though at the silicon level rather than complete boards.

Emerging players

• Husarion: Polish robotics platform company offering ROS2-based robot controllers (ROSbot) for research and commercial robot developers. Comparable to KSJ's RB100 as an integrated ROS2 + real-time robot development platform, though Husarion focuses on mobile robots and education/research rather than industrial EtherCAT motion control.

Direct peers

• TRINAMIC Motion Control (now part of Maxim Integrated / Analog Devices): Hamburg-based specialist in motor control ICs and modules for stepper and BLDC motors, integrated with EtherCAT and other industrial protocols. Comparable to KSJ's Inros/Kyros motor driver business at the compact, embedded motion control level, though TRINAMIC focuses on IC-level products rather than finished driver boards.
• Beckhoff Automation: German inventor and dominant supplier of EtherCAT technology, offering EtherCAT masters, slaves, and integrated PC-based control. Directly comparable to KSJ as the benchmark for EtherCAT stack and motion control performance, though at vastly greater scale (thousands of employees) and with a broader portfolio of PLCs, drives, and IoT products.
• acontis technologies: German provider of EtherCAT master and slave software stacks (EC-Master, EC-Engineer) plus embedded EtherCAT solutions. Directly comparable to KSJ's proprietary FPGA-based EtherCAT stack business, though acontis licenses software rather than selling FPGA-based boards. Competes for the same EtherCAT integration customer base.
• HMS Industrial Networks: Swedish-headquartered specialist in industrial communication including EtherCAT, PROFINET, and EtherNet/IP gateways, masters, and slaves. Comparable to KSJ as a focused industrial communication specialist with similar target customers (machine builders, equipment OEMs), though HMS also covers non-EtherCAT protocols.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 records

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about KSJ