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SEMITEC Corporation is a Japanese manufacturer of electronic components, notably thermistors, sensors, surge absorbers and current devices.

Last updated September 16, 2026

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Overview

SEMITEC Corporation is a Japanese electronic components manufacturer. Its business is the manufacture and sale of electronic components, with product lines covering various sensors (bulk sensors, thin-film sensors, infrared sensors), surge absorbers, silicon surge absorbers, varistors, current devices and other items such as power thermistors, constant-current diodes and various modules. The company was established in March 1958 in Edogawa-ku, Tokyo as Ishizuka Electronics Corporation, and changed its name to SEMITEC Corporation in March 2011. Its head office is in Sumida-ku, Tokyo.

History

SEMITEC Corporation was established in March 1958 in Edogawa-ku, Tokyo as Ishizuka Electronics Corporation with capital of 500 thousand yen, and began manufacturing varistors. In August 1960 it established a factory in Narashino City, Chiba Prefecture and began manufacturing bulk-type thermistors. In July 1964 it established the Chiba Factory in Chiba City, Chiba Prefecture and relocated from Narashino City. In June 1988 it established a head office building in Sumida-ku, Tokyo and relocated from Edogawa-ku. In December 1989 it established the sales company SEMITEC USA CORP. in New York, USA. In March 1992 it began manufacturing thin-film sensors incorporating semiconductor technology. In March 1995 it established the sales company SEMITEC (HONG KONG) CO.,LTD. in Hong Kong, China. In October 1996 it acquired shares of Jiangsu Xingshun Electronics Co., Ltd., a sales and production company in Xinghua City, Jiangsu Province, China. In November 1999 it established the sales company SEMITEC TAIWAN CORP. in Taipei, Taiwan. In May 2000 it opened the World Technology Center as a technology development base at the Chiba Factory and established the production company SEMITEC ELECTRONICS PHILIPPINES INC. in Rosario, Philippines; in November 2000 it established the sales and production company SEMITEC KOREA CO.,LTD. in Seoul, South Korea. In February 2002 it established the sales and production company Taizhou Ishizuka Sensing Electronics Co., Ltd. in Taizhou City, Jiangsu Province, China. In April 2003 it established the sales company Kanno Trading (Shenzhen) Co., Ltd. in Shenzhen, China. In January 2005 it acquired shares of the Hong Kong production company S.E.G. CO.,LTD.; in June 2005 it established the production company Shimeite Electronics (Weihai) Co., Ltd. in Weihai City, China. In February 2007 it established the sales company Ishizuka International Trading (Shanghai) Co., Ltd. in Shanghai, China. In November 2008 it established the production company Shaoguan Xiaojinjing Electronics Co., Ltd. (now Ishizuka Sensing Electronics (Shaoguan) Co., Ltd.) in Shaoguan City, China; in December 2008 SEMITEC USA CORP. relocated from New York to Los Angeles. In March 2011 it changed its company name from Ishizuka Electronics Corporation to SEMITEC Corporation; in April 2011 it established Thai Semitec Co.,Ltd in Chonburi, Thailand, established the production company Ishizuka Sensing Electronics (Shenzhen) Co., Ltd. in Shenzhen, China, changed the trade name of Shaoguan Xiaojinjing Electronics Co., Ltd. to Ishizuka Sensing Electronics (Shaoguan) Co., Ltd., and listed on the Osaka Securities Exchange JASDAQ (Standard); in December 2011 it established SEMITEC Europe GmbH in Germany.

Products and positioning

  • Thermistors

    NTC thermistors made from metal-oxide ceramic semiconductors, offered in series such as NT, FT, AP, AT, ET, JT, KT and CT.

  • Thermistor sensors

    Temperature sensors made by processing high-precision, high-reliability thermistor elements into shapes suited to applications, including custom assemblies.

  • NC sensors

    Non-contact temperature sensors using SEMITEC's proprietary infrared detection structure, composed of two high-precision thermistors.

  • Thermopiles

    Infrared sensors applying thermocouple principles, using silicon micromachining technology.

  • Small air velocity sensor

    Thermal-type air velocity sensor using silicon micromachining, with response time of tens of milliseconds.

  • ZENAMIC surge absorbers

    Metal-oxide varistors under SEMITEC's trademark name ZENAMIC, made from ZnO-based ceramic sintered at 1,200–1,400°C.

  • VRD silicon surge absorbers

    Silicon surge absorbers developed to absorb steeply rising surge voltages using avalanche effect of silicon junctions.

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