Semiconductor relay that combines LEDs and
MOS FET chips to realize relay functions

A MOS FET relay is a non-contact relay used primarily for switching and connecting signals. It has mechanical relays and semiconductors features and is used in a semiconductor inspection system, various measurement devices, security equipment, and a wide range of other applications.

MOS FET Relay Cross Section

A MOS FET relay is a semiconductor relay that uses MOS FET as its output element.
The MOS FET relay consists of the following three chips:

Principle and Function of MOS FET Relay

Compared with mounting area for 10 pieces (mounted at 0.3mm intervals)

The absence of contact points (i.e., no mechanical life) reduces maintenance frequency for products that use many relays.

Compared to mechanical relays, the ON resistance of MOS FET relays that have no contacts does not depend on the number of switching cycles.

Compared to reed relays, power consumption on the input is very low, contributing to the energy saving of equipment.

Mechanical Relay (Reed Relay)	VS	MOS FET Relay
		No mechanical contact = No contact sound
		No mechanical contact = No contact bouncing
Surge absorber is required to protect peripheral circuits from surges (reverse voltage) generated by the coil		No coil, thus no surge (reverse voltage)
G6S-2F 220 VDC		High-voltage type comparable to mechanical relays also availableG3VM-601DY1 Max. 600 VDC
G6S-2F 2000 VAC (1 min.)		High-dielectric strength type comparable to mechanical relays also availableG3VM-601DY1 Max. 5000 VAC (1 min.)

The output elements of transistor couplers and TRIAC couplers have low linearity, resulting in distortion of the signal passing between outputs.
Unlike transistor couplers and TRIAC couplers, MOS FET relays suppress signal distortion due to their excellent linearity characteristics comparable to mechanical relays.
The ability to control analog signals makes it ideal for testers and measuring instruments.

The output switching current of MOS FET relays is not affected by the input current.
MOS FET relays can operate at very low currents, contributing to power savings in equipment. Even after its lifetime, the output current does not drop as it does with transistor couplers.

Transistor couplers consume more power than MOS FET relays because a larger input current also results in a larger output current.
Therefore, more power is consumed because the output is also weakened by LED degradation.

Compared to other semiconductor devices, the leakage current in the off-state is very small, making it possible to measure minute currents. Suppressing unnecessary leakage current contributes to lower heat generation and less circuit malfunctions, which are factors in performance degradation.

Variations available for both AC and DC expand the range of applications.

Transistor coupler	TRIAC coupler	MOS FET relay
DC only	AC only	Supporting AC or DC

Low heat generation due to low on-resistance
No heat sinks or other components to dissipate heat are required.

Package Types

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MOS FET Relay Model Standard

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MOS FET Relay Packaging Types

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Product Map

OMRON offers a wide range of MOS FET relays so that you can select the right product for your application.
For a selection of MOS FET relays, please refer to the product selection guideline.

Product Selection Guideline

4-minute Real Verification! Mechanical relay vs MOS FET relay

MOS FET Relay Module

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