OMRON Releases World's First MOS FET Relay Module "G3VM-21MT" with Solid State Relay in "T-type Circuit Structure"

KYOTO, Japan, Dec. 12, 2019 /PRNewswire/ -- OMRON Corporation of Kyoto, western Japan globally released its new MOS FET (*1) relay module "G3VM-21MT" on December 2, 2019. The product is the first electronic component in the world (*2) to adopt a "T-type circuit structure" (*3). With T-type circuit structure consisting of compact-size and longer-lifecycle solid state relays that output signals using no physical contact, the relay module minimizes the leakage current (*4) that has long been a problem with semiconductor test equipment. G3VM-21MT allows high-precision measurement and improves productivity of electronic components.

G3VM-21MT enables switching measurement signals in test equipment mainly used to perform electrical tests for semiconductor devices. In addition to the MOS FET relay features of compact size and longer lifecycle, G3VM-21MT is the world's first MOS FET relay module with "T-type circuit structure" which consists of three MOS FET relays that help reduce the leakage current to a minimal level without affecting test equipment's inspection accuracy while allowing high-precision measurement and decreasing maintenance frequency of test equipment.

Amid the digital age where functions of electronic components are getting diversified and production volume is increasing, there is a growing need for higher performance of semiconductor test equipment. Mechanical reed relays (*5), which have been used for a part that performs high-precision measurement in semiconductor test equipment, have extremely low leakage current but they require replacement on a regular basis, maybe several times for every single month due to wear and abrasion of the contacts that lead to affecting measurement accuracy. Such maintenance work may substantially affect production efficiency and so adoption of solid state relays has been long desired for their longer lifecycle. So far, MOS FET relays are considered not suitable for precise electrical tests due to technological difficulty to reduce leakage current in relation with its feature, and were not used in test equipment which requires high reliability.

To meet these needs, by utilizing OMRON's technologies of electronic components cultivated over many years, the company has succeeded in commercializing the relay module product by adopting the "T-type circuit structure" and significantly reducing leakage current to a level lower than or equal to 1pA (one-trillionth part of the ampere). The challenge in reducing leakage current in a solid state relay as close to zero as possible eliminates leakage current problem and improves test equipment reliability. Moreover, by integrating long-life MOS FET relays into the relay module, it allows for shorter downtime for maintenance which has been a long-standing challenge for mechanical relays. With the launch of G3VM-21MT, OMRON will strive to contribute to improving the productivity of electronic components and support the evolution of digital transformation in society.

Photo: G3VM-21MT

(*1) MOS FET= Metal-Oxide-Semiconductor Field-Effect Transistor (a type of field-effect transistor).

(*2) The world's first relay module (as of April 2019) adopting a "T-type circuit structure" in which several different MOS FET relays are combined, according to OMRON's own research.

(*3) A circuit structure commonly used in electronic devices, such as an attenuator, to minimize leakage current.

(*4) A condition that occurs inside the electric circuit where current leaks through the insulation, which otherwise should have stopped electricity from passing through.

(*5) The two reeds with contacts located in the glass tube are switched (open and close) by the magnetic flux of coil wrapped around the glass tube.



1. High equipment reliability by reducing leakage current to 1pA or less:

Leakage current has been a long-term disadvantage of semiconductor relays and G3VM-21MT helps solve the problem by minimizing the leakage to 1pA or less. G3VM-21MT successfully achieved an actual leakage level lower than or equal to 0.1pA while minimizing the impact on measurement accuracy of the application.

2. Longer lifecycle and significant decrease in maintenance frequency:

The output circuit of the G3VM-21MT relay module consists of semiconductor MOS FET relays using no physical contact, hence no need to perform maintenance on the contacts for wear or abrasion as there will be no arc discharge generated from opening and closure of the circuit.

3. Reduced mounting space -- high-density mounting by space-saving and wire-saving:

G3VM-21MT achieves compact size of 5mm x 3.75mm x 2.7mm by incorporating the complex wiring diagram of input and output circuits into the internal module, ultimately simplifying PCB wiring of the application.

About OMRON Corporation

OMRON Corporation is a global leader in the field of automation based on its core technology of "Sensing & Control + Think." OMRON's business fields cover a broad spectrum, ranging from industrial automation and electronic components to social infrastructure systems, healthcare, and environmental solutions. Established in 1933, OMRON has about 35,000 employees worldwide, working to provide products and services in around 120 countries and regions. For more information, visit OMRON's website:

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SOURCE OMRON Corporation