STK technology

What STK technology does

STK Technology Co., Ltd. (エスティケイテクノロジー株式会社) is a privately held Japanese corporation founded in Oita on June 5, 1975 (originally as Shintsurukai Kosan Co., Ltd., renamed in April 2000) that designs and manufactures semiconductor burn-in (BI) test equipment and operates an in-house reliability test house. The core technology platform is the proprietary SBS-series BI equipment family — SBS-M1 (variable-power logic/analog sharing), SBS21005 (high-current multi-channel LSI), SBS22020 (NAND/DRAM interface), SBS21033 (1,000V IGBT), SBS-HP01 (individual per-DUT thermal control via evaporative latent heat cooling, supporting 0.5–500 W/DUT in a –40°C to 150°C chamber), and SBS22019 — together with the BD700R board-handler for automated insertion/extraction. The company vertically integrates burn-in board design, FPGA/hardware, C/C++/C#/VB control software, and 3D-CAD mechanical engineering across eight Oita plants.

STK operates five revenue streams: (1) one-time sales of burn-in equipment and burn-in boards via direct enterprise field sales with embedded engineers; (2) recurring test house services covering reliability evaluation, prototyping, defect/failure analysis, and 24-hour mass-production testing, certified under ISO/IEC 17025:2017, IATF16949 (Recognized Laboratory), and VDA6.3, with JAXA-qualified status since September 2010; (3) mechatronics OEM/ODM production with Mazak Variaxis 5-axis machining, robotic Yaskawa/Daihen TIG welding, and full assembly for semiconductor handlers and chip-transport equipment; (4) ISO27001:2022-certified system development covering firmware, embedded OS porting (µiTRON, VxWorks, Linux, WindowsCE), and server/network solutions for network equipment, security, medical, and broadcast OEMs; and (5) non-core insurance agency commissions and Tsurukai Golf Center operations. Customers are global semiconductor manufacturers of Logic, Analog, MCU, IGBT, NAND, DRAM, and image-sensor devices, supported domestically by sales offices in Tokyo, Nagoya, and Fukuoka and internationally by the Hsinho Advanced Technology INC. Taiwan joint venture established April 1999.

The company employs approximately 580–597 staff, reported FY2022 sales of ¥18.3 billion, and operates with ¥100 million in capital. The Hikita founding family retains board leadership (Chiaki Hikita as Chair, Koudou Hikita as Vice Chair), with Hiroaki Nojiri serving as President since June 2021 following the resignation of Masato Tazaki. Capacity was expanded with the Sano No.2 Plant (completed December 2024, operational January 2025) and the Sano No.3 Plant (completed December 2025). The broader Tsurusaki Group encompasses six adjacent operating companies in logistics, environmental services, construction, and electronics distribution, providing supply-chain stability. STK marked its 50th anniversary in June 2025 and has consistently hired 21–47 new graduates annually from 2020 through 2026.

Name

STK technology

Legal name

エスティケイテクノロジー株式会社 (STK TECHNOLOGY CO., LTD.)

Website

https://stk-net.co.jp

Company type

Private

Founded year

1975

Operating status

Operating

Headcount range

501–1,000 employees

Short description

STK Technology is a privately held Japanese semiconductor burn-in equipment manufacturer and ISO/IEC 17025-certified test house serving logic, memory, automotive, and IGBT device makers globally. Founded in 1975 in Oita, it combines proprietary SBS-series BI equipment with mechatronics OEM/ODM and system development.

Ownership category

akta.pro rank

Product category

Semiconductor Test Equipment

NAICS

Semiconductor Machinery Manufacturing (333242), Instrument Manufacturing for Measuring and Testing Electricity and Electrical Signals (334515), Testing Laboratories and Services (541380)

SIC

Instruments For Meas & Testing Of Electricity & Elec Signals (3825), Semiconductors & Related Devices (3674), Services-Testing Laboratories (8734)

akta.pro primary industry

Test, Probe & Burn-In Equipment (Wafer Sort/Final Test) (HDAHAEAJ)

akta.pro secondary industries

Test & Measurement Equipment (Oscilloscopes, DAQ, signal analyzers, calibration benches) (IMAGAFAC), Foundry Platform & Design Enablement Services (PDK/DFM/Process Qualification) (HDAHACAJ)

Keywords

• Semiconductor burn-in equipment
• Reliability test house
• Mechatronics OEM ODM
• Embedded systems development
• Semiconductor test services

Headquarters

HQ city

Oita

HQ country

Japan

HQ region

Asia

Offices13 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Semiconductor Manufacturing Equipment Sales: One-time sales of proprietary burn-in equipment and burn-in boards (SBS-M1, SBS21005, SBS22020, SBS21033, SBS-HP01, SBS22019, BD700R, plus burn-in boards and related services). Sold globally to semiconductor manufacturers; pricing is quote-based.
2. Test House Services (Reliability Evaluation & Mass-Production Testing): Recurring / per-engagement service revenue from in-house test house operations: burn-in reliability testing, prototyping, evaluation, mass production (24-hour support), defect/failure analysis, program development, jig development, yield improvement consulting. ISO/IEC17025 (2017) certified; IATF16949 (RL) and VDA6.3 compliant for automotive products.
3. Mechatronics OEM/ODM Production: Contract design, parts manufacturing, and assembly for mechatronic equipment (semiconductor test handlers, chip transport equipment, appearance inspection equipment). One-stop production from sheet-metal, welding, and machining through final assembly.
4. System Development Services and Products: Custom application development, firmware/embedded software, server/network infrastructure, and hardware design sold as project work and licensed products to OEM customers (IP routers, security, medical, broadcast equipment).
5. Insurance Agency Commissions: Insurance agency handling life and property insurance from multiple carriers (Aflac, Tokio Marine & Nichido, Sompo Japan, Sompo Himawari Life). Revenue from commissions on policies sold, with life-long after-sales support.
6. Golf Driving Range Operations: Per-use fees from Tsurukai Golf Center (180-yard driving range), including individual/corporate/general membership plans and automatic ball dispensers. Open to public.

Pricing tiers

Go-to-market motion4 records

Distribution channels7 records

Marketing channels8 records

Core offering

STK Technology designs, manufactures and sells proprietary semiconductor burn-in test equipment (SBS-M1, SBS-HP01, SBS21005, SBS22020, SBS21033, SBS22019, BD700R) and operates an in-house ISO/IEC 17025-accredited test house for reliability evaluation, prototyping and 24-hour mass-production burn-in. The company complements this with mechatronics OEM/ODM manufacturing (precision machining, robotic TIG welding, assembly) and ISO27001-certified system, firmware and embedded software development for OEM customers in network, security, medical and broadcast equipment.

Product overview

STK Technology operates a portfolio of semiconductor-focused products and services rather than a single unified software product. The core platform is its Equipment Development business, anchored by the SBS-series burn-in test systems (SBS-M1, SBS22020, SBS21005, SBS21033, SBS-HP01, SBS22019) and the BD700R board handler, which together form the manufacturing-equipment backbone. This equipment base feeds the Test House service line, where STK runs burn-in and reliability tests for third-party semiconductor customers under ISO/IEC 17025 accreditation. Mechatronics and System Development operate as adjacent engineering service lines: Mechatronics provides precision mechanical/electronic design that complements the burn-in equipment, while System Development delivers custom hardware/software solutions across Windows, UNIX, Linux, iOS, and Android. The Insurance Agency and Golf Driving Range are non-core subsidiary businesses held by the group.

Differentiator

Problem solved

Functional benefit

Products and services

• SBS-M1 Burn-In Equipment (Variable Power Supply, Logic/Analog Sharing) Proprietary variable power supply burn-in system for logic, analog, MCU and IGBT semiconductor devices, used by semiconductor manufacturers for reliability stress testing.
• SBS-HP01 Burn-In Equipment (Individual Thermal Control, Evaporative Latent Heat Cooling) Burn-in equipment with per-DUT individual thermal control using evaporative latent heat cooling, supporting -40°C to 150°C automotive-grade semiconductor stress testing.
• SBS21005 High-Current Multi-Channel Burn-In System for Highly Integrated LSI High-current, multi-channel burn-in system for highly integrated LSI devices requiring high power supply capacity.
• SBS22020 NAND/DRAM Burn-In System Burn-in equipment with NAND and DRAM interface support for memory device reliability qualification.
• SBS21033 1,000V IGBT Burn-In Equipment IGBT-capable high-voltage burn-in equipment rated to 1,000V for power semiconductor reliability testing.
• SBS22019 -40°C Low-Temperature Burn-In Chamber Burn-in chamber supporting -40°C low-temperature reliability stress testing of semiconductors for automotive-grade and high-reliability device programs.
• BD700R Board Handler (Burn-In Board Insertion/Extraction Automation) Automated board insertion/extraction handler with auto open/close of the burn-in chamber and automatic carrier rack transport, integrated with the burn-in chamber for smart-factory BI process automation.
• Semiconductor Test House Services (Burn-In Reliability Evaluation & Mass-Production Testing) In-house ISO/IEC 17025, IATF16949 (RL) and VDA6.3 compliant test house providing burn-in reliability evaluation, prototyping, defect/failure analysis, program and jig development, yield improvement consulting and 24-hour mass-production testing for semiconductor manufacturers.
• Mechatronics OEM/ODM Production One-stop OEM/ODM production of mechatronic equipment from 3D-CAD design, sheet-metal working, robotic TIG welding and 5-axis machining (Mazak Variaxis) through assembly, used by semiconductor equipment OEMs and chipmakers for test handlers, chip transport and appearance inspection equipment.
• System Development Services (Application, Firmware, Embedded OS, Hardware Design) ISO27001:2022 certified custom application, firmware, embedded OS (µiTRON, VxWorks, Linux, WindowsCE), server/network virtualization and analog/digital hardware design services sold as project work and licensed products to OEM customers in IP routers, security, medical and broadcast equipment.
• Insurance Agency Services (Life and Property) Insurance agency distributing life and property insurance policies from Aflac, Tokio Marine & Nichido, Sompo Japan and Sompo Himawari Life, offering free in-person consultation and life-long after-sales support to individuals and corporate customers.
• Tsurukai Golf Center (180-Yard Driving Range) Public 180-yard driving range with target green and automatic ball dispensers, serving individual, corporate and general members with weekday/holiday and early-morning pricing plans.

Quantifiable outcome

• 30+ year test house track record with ISO/IEC17025, IATF16949 (RL), VDA6.3 certifications
• +4 more outcomes

Named customers1 record

Segments6 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

16 partnerships are on record, tiered core, moderate and minor.

• Hsinho Advanced Technology INC. (Taiwan)coreStrategic or Co-development PartnerJoint venture established in April 1999 in Hsinchu, Taiwan. Acts as STK's regional sales, distribution, and field engineering arm for Taiwanese semiconductor customers. Located at 1F, No. 82, Hsin Thai Road, Jubei, Taiwan, R.O.C. (hati.com.tw). Provides local presence in a major Asian semiconductor hub.
• Tsurusaki Sealand Transportation Co., Ltd. (鶴崎海陸運輸株式会社)coreOthersSTK group company headquartered at 1000 Misa, Oita-shi; capital ¥80 million; representative Tomoaki Hikita. Main business: port transport, freight hauling, oil sales, shipping agency. Provides logistics and supply-chain support for STK's Oita operations.
• HOKS Co., Ltd. (株式会社ホックス)moderateOthersSTK group company located at 4260-1 Kawasaki, Hiji-machi, Hayami-gun, Oita; capital ¥60 million; representative Mutsuharu Kotsubo. Main business: production and distribution of electronic devices. Complementary electronics manufacturing capability within the group.
• Nishinosu Environment Inc. (西ノ洲環境株式会社)moderateOthersSTK group company located at 1-1-63 Mukaibaruoki, Oita-shi; capital ¥30 million; representative Mikio Fujisawa. Main business: industrial waste disposal, afforestation/gardening, cleaning, and Aqua Clara Oita mineral water. Supports STK's environmental compliance and CSR activities.
• Tsurukai Transportation Co., Ltd. (鶴海運輸株式会社)moderateOthersSTK group company located at 2 Ozai, Oita-shi; representative Takashi Fujisawa. Main business: freight hauling, port transport, warehouse services. Additional logistics support for STK operations.
• Nakanosu Construction Industry Co., Ltd. (ナカノス建設工業株式会社)minorOthersSTK group company located at 988 Misa, Oita-shi (in the Tsurusaki Sealand Transportation HQ building); capital ¥50 million; representative Yuzu Shiimoto. Main business: civil engineering, construction, design contracts, Nakanosu Home sales, real-estate transactions. Supports construction and real-estate needs of the group.
• Oita Marine Service Co., Ltd. (大分マリンサービス株式会社)minorOthersSTK group company located at 1-8 Nakanosu, Oita-shi; capital ¥10 million; representative Kazuyuki Takiguchi. Main business: port services and crew service business.
• Oita Prefecture LSI Cluster Formation Promotion Council (大分県LSIクラスター形成推進会議)moderateStrategic or Co-development PartnerSTK serves as a board member of the Oita Prefecture LSI Cluster Formation Promotion Council, an industry-academia-government initiative to develop and revitalize the regional semiconductor industry. Engages in joint research projects and supports the local semiconductor ecosystem.
• Oita University (大分大学)moderateImplementation/ SI/ Consulting PartnerHosts Burn-In process study sessions for the Faculty of Science and Technology (理工学部) and gives lectures as part of university industry-academia collaboration. STK accepted as part of the 'Oita Sangikan-bi' company-tour event organized by the Oita LSI Cluster, Oita Industrial Federation, and local universities.
• Nippon Bunri University (日本文理大学)moderateImplementation/ SI/ Consulting PartnerParticipates in the Oita Prefecture-led 'In-class Lectures / Social Engagement Practicum' (学内講義・社会参画実習) targeting Nippon Bunri University students, providing semiconductor-industry-focused lectures.
• Tsurusaki Industrial High School (鶴崎工業高校)minorImplementation/ SI/ Consulting PartnerHosts recurring high-school internships (electrical, mechanical, and electronics departments) at the Sano No.1, Ebisudo, and precision-processing plants. Provides students with hands-on experience in metal processing, circuit design, and soldering.
• Oita Information Science High School (大分情報科学高校)minorImplementation/ SI/ Consulting PartnerHosts AI Technology Department internships at STK's Ebisudo and other plants, exposing students to circuit design and soldering of electronic substrates.
• Oita National College of Technology (大分工業高等専門学校) / Oita KOSENminorImplementation/ SI/ Consulting PartnerHosts 2nd-year Electrical and Electronic Engineering students for plant tours at the head office plant, where developers explain the burn-in equipment and IC handler.
• Mynavi / Rikunabi (job-site partners)coreGTM or Marketing PartnerMaintains corporate profiles and entry-point listings on Mynavi (job.mynavi.jp) and Rikunabi (job.rikunabi.com), Japan's two largest job-search portals. These channels handle all new-graduate application intake and online info-session registration.
• Yamazaki Mazak (Mazak)moderateTechnology or IntegrationSTK's precision processing factory was featured in Mazak's 'Cyber World No.60' corporate magazine in July 2020. Mazak equipment (FJV, VTC, Variaxis, HCN, NEXUS, etc.) is used across STK's mechatronics plant.
• Suppliers / partner companies (協力企業様)moderateOthersSTK actively recruits partner companies (協力企業) in the mechatronics field for sheet-metal working, TIG welding (especially stainless), machining, and frame welding. Provides technical guidance and on-boarding support to new suppliers.

Scale indicators10 records

Recent moves15 records

Expansion highlights6 records

Direct peers

• Advantest Corporation: Japanese semiconductor test equipment leader (handlers, ATE, and burn-in-related solutions) serving the same global semiconductor manufacturer customer base that STK addresses with its SBS-series burn-in systems. Closest large-cap direct comparable.
• Aehr Test Systems: US-based pure-play semiconductor burn-in and wafer-level burn-in equipment vendor, directly competing with STK's SBS-M1 and SBS-HP01 product family for logic, memory, and high-power device reliability testing.
• Cohu, Inc. US-based supplier of semiconductor test handlers and burn-in equipment, directly comparable to STK's BD700R board handler and burn-in systems for automotive and high-reliability test customers.
• UniTest Inc. Korean maker of burn-in and reliability test equipment for memory and logic devices, including NAND/DRAM burn-in testers that overlap with STK's SBS22020 product line. Direct competitor in Asian semiconductor hubs.

Broad incumbents

• Chroma ATE Inc. Taiwan-based broad-line test and measurement vendor with semiconductor burn-in, handler, and reliability testing systems; competes with STK in the same Taiwan semiconductor customer base via Hsinho's territory.
• Teradyne, Inc. Global semiconductor ATE leader with adjacent handler and reliability-test offerings; serves the same enterprise semiconductor customer segment STK targets but at much larger scale and broader portfolio.

Emerging players

• Espec Corp. Japanese manufacturer of environmental test chambers and reliability test equipment; partial overlap with STK's temperature-controlled burn-in (SBS-HP01, SBS22019) and reliability test house offerings, especially for automotive-grade qualification.

Regional players

• Honda Electronics Co., Ltd. Japanese semiconductor capital equipment maker serving Japanese customers with reliability testing and related equipment; comparable regional footprint and customer overlap in domestic semiconductor manufacturers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@stktechnology7931
• LinkedInlinkedin.com/company/stk-technology-co-ltd-

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 records

Subsidiaries7 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 STK technology