Relay Basics 2-6 MOS FET Relays

Non-contact relays, mainly used for switching and connecting signals, are used in a wide range of applications, including semiconductor test equipment, measuring instruments, and security equipment.

Features

Ultra-small and lightweight	SSOP, USOP and other new ultra-small packaging VSON are emerging, which contributes to miniaturization of the entire device.
Low drive current	The drive current is about 2 to 15mA under the recommended operating condition (normal). We also have a minimum of 0.2 mA products which contribute to energy saving of whole device.
Longer-life	Our MOS FET relays have a non-contact structure using an optical signal transmission method. We have achieved long durability without deterioration of life due to contact friction.
small leakage current	Because of its high resistance to external surges and no added snubber circuit, the leakage current is extremely small, typically 1 nA or less in the off state. (G3VM-□GR□,-□LR□,-□PR□,-□UR□)
superior impact resistance	Since the internal parts are completely molded and there are no mechanical parts such as movable parts, they are excellent in shock resistance and vibration resistance.
Quiet sound	Since there is no switching noise caused by metal contacts unlike machine relays, it contributes to noise reduction of device.
High insulation	Since there is no switching noise caused by metal contacts unlike machine relays, they contribute to noise reduction of device.
Precise control of small analog signals	Since the dead band is extremely small compared to a triac etc, the input waveform of a small analog signal is converted into an output waveform with little distortion.

For more detailed information

Features of MOS FET relay series

Types

Product map by MOS FET relay type

Structure

Basic structures and operating of MOS FET relays

MOS FET relays consist of following three chips:

LED chips
PDA (photodiode array) chip
MOS FET chips

MOS FET relays operate according to the following principles.

The LED lights when the current flows to the input side.
The light from the LED is received by the photodiode array, which generates electricity to convert the light back to a voltage
This voltage passes through the control circuit to become the gate voltage to drive the MOS FET.

Application example

FA/Industrial equipment

Machine tools, custom power supplies, FA devices (programmable controller/temperature controller/timer)

ApplicationStatus output, various signals, small solenoid valve,　power supply external output of small motor

Machine tools
Timer

Test measurement/testers

Semiconductor test equipment (ATE)/semiconductor test interface boards, oscilloscopes, data loggers, I/O boards

ApplicationMeasurement signal switching, power supply

ATE
(Semiconductor test equipment)
Tester

Security devices

Smoke and gas detectors, home security panels, human body detection sensors and TV doorphones

Applicationstatus output, various signal output, small solenoid valve, power supply external output of small light

Smoke and gas detector
Home security panel

Amusement equipment

paper money discrimination units, game ball and medal lending machines (interposed machine), IT equipment

Applicationstatus output, various signals

Gaming machines

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Part 1 What is a Relay?
Part 2 Types of Omron Relays