FOD410S

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Optoisolators - Triac, SCR Output are devices used to electrically isolate two circuit portions from each other, providing high isolation. The FOD410S Optocoupler is one of the members of this family of devices. This document introduces the application fields of FOD410S as well as its working principle.

Application and Features

The FOD410S optocoupler consists of an infrared LED driven by an integrated photogallery, which provides high level of electrical isolation and fast speed. It has a direct current transfer ratio—DCR—of 25mA to 100mA, input-output isolation of 1000V rms, and propagation delay of 1.5μs. This makes it especially well-suited for line-powered applications, AC motor controls, integrated switchover relays, and logic control.

The FOD410S features low cost and miniature size for easy installation, driving one or two SCR’s or triac’s, and low standby current. It is available in 4 pin DIP (dual-in-line package) and SOIC (small outline integrated circuit) packages.

Working Principle

The working principle of FOD410S optocoupler is based on the use of LED to drive a photogallery. The LED in the optocoupler emits light when it is driven by the input signal. This light is received by the photogallery, which then converts it into an electron flow that is read out by the control circuit. The control circuit then outputs an output signal that drives the attached device.

The photo-current produced by the photogallery is limited by the collector-emitter resistance, while the voltage drop between the emitter and collector is related to the LED’s response to the optical stimulus. This arrangement of LED and photogallery is known as opto-coupling, and provides efficient electrical isolation from the input signal and the output.

To summarize, the FOD410S Optocoupler provides electrical isolation between input and output and is suitable for various high-isolation, high-speed applications that require low cost and small size. The working principle of the FOD410S is based on the use of LED and photosensitive material to convert the input signal into output.

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