SFH615AY-X008T

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The SFH615AY-X008T is a photovoltaic output optoisolator design that provides electrical insulation between the input & output circuits enabling the operator to perform isolated switching control. This particular design combines a high lumen gallium phosphide (GaP) red LED emitter with a power open collector general purpose transistor (Octal DIP). Offering excellent noise suppression, the SFH615AY-X008T also provides auxiliary LED indicators for visual communication.

The SFH615AY-X008T’s primary application field is that of power switch circuits that require electrical insulation between input and output. This is due to the optoisolator’s ability to provide a switching control system that is not affected by outside noise interference & EMI while allowing separate operation of the input and output stages.

The device itself utilizes a Photovoltaic output method to switch signals with a superior combination of frequency response, common mode & transient electrical noise rejection. This is possible due to a combination of optoelectronic integration and circuit optimization.

The operation of the device begins with a light source, most typically an LED emitter, being used as the input component. This input LED is usually driven by either an electric current or voltage signal and is powered on through an input voltage applied by the operator.

A light from the LED is then projected towards a photodetector, the photovoltaic module, that is used to convert the input light into electrical voltage & current.

The resultant electrical output is then used to drive a power output transistor (Octal DIP), that functions as the power output stage to achieve switching of output signals.

A very common application of the SFH615AY-X008T is in controlling DC-to-DC converters. The advantage of the SFH615AY-X008T in this purpose is clear, as its isolation properties provide superior protection from external electrical noise and it is best suited for long-distance applications where power switching from the load towards the source is required.

The SFH615AY-X008T also offers greater protection from common & transient electrical noise, allowing for reliable operation in high electrical noise environments. This provides excellent operation in EMI sensitive applications.

Additionally, the SFH615AY-X008T’s incorporation of the auxiliary LED indicators provide visual tracking for troubleshooting & optimization of the device’s performance. These indications make it easy to identify if a short circuit or over current has been detected before or after switching. Similarly, the integrated diagnostic LED allows for further optimization & diagnostics of the device’s performance.

The SFH615AY-X008T’s well-matched performance, wide range of industrial applications, very reliable design & superior EMI suppression make it ideal for both low & high-power isolation circuits. Its features allow it to switch signals with a superior combination of frequency response, common mode & transient electrical noise rejection in both low current & high power applications.

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