Solid State Relays for Indoor Security Applications

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Solid state relays (SSRs), optoelectronics devices consisting of an IR emitter and photo sensitive MOSFET drivers in a plastic package, can replace reed relays and other electromechanical relays (EMRs) in many applications. Because of their small form factor, SSRs save board space and provide clean, bounce-free switching. They are noise and maintenance free, and offer long life. With no arcing during switching operations, SSRs are capable of switching AC or DC loads.

Vishay’s VO1400AEFTR SSR provides the required input-output isolation for security systems, including passive infrared detectors, glass break sensors, and other perimeter security sensors. The device’s key features for security applications are its low on-resistance and trigger current, and high load voltage.

Minimizing on-resistance is a very important concern for security system designers, as their customers connect multiple PIRs in series. With a low on-resistance of 5Ω, the VO1400AEFTR permits customers to hook up more devices.

The VO1400AEFTR’s low input trigger current of 1mA, compared to 7mA for EMRs, allows direct interface with digital logic without the need for expensive drivers. The load voltage of 60V provides extra headroom for overvoltage protection.

 

Typical application block diagram

 

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Part Number		Description	Data Sheet	App. Notes
VO1400AEFTR		1 Form A Solid State Relay

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