MOS FET RELAY DEFINITION
MOS FET relays are semiconductor relays that use MOS FET for their outputs.
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.
MOS FET Relay Features
| Small and lightweight | Strengthen the small product lineup. P-SON, VSON, S-VSON contribute to the 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-□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 | MOS FET relays offer great I/O isolation due to their operational principles. They turn the voltage into light and transfer by light signal, therefore input and output are isolated. The standard models offer 2,500 Vrms between input and output. Superior 5,000 VAC products are also available. (5,000Vrms Products-G3VM-□Y□) |
| 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. |
MOS FET Relay Types
Product map by MOS FET relay type
MOS FET Relay Diagram
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.
MOS FET Relay Application Examples
FA/Industrial equipment
Machine tools, custom power supplies, FA devices (programmable controller/temperature controller/timer)
Application Status 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
Application Measurement 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
Application status 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
Application status output, various signals
Gaming machines
