FOD4218S

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The FOD4218S optoisolator belongs to the family of Triac, SCR Output photorelays. It provides isolated and robust switching for 120V AC loads withstanding up to 4000V of electrical isolation. This device helps to prevent electrical noise interference, protects circuits from transient overvoltage, and ensures high reliability in switching operations. With its wide working temperature range, it can be used in various application fields.

The optoisolator consists of a light emitting diode (LED) and a photosensitive Triac or SCR output. When a current is supplied to the LED, light is emitted, which is then converted into a corresponding electrical voltage by the photosensitive output. The electrical voltage signal is then used as an input signal for the load. The optoisolator thus creates a barrier between the input and output circuits and provides high level of electrical isolation.

FOD4218S optoisolators are commonly used in industrial machinery as well as household appliances. It can be used for brushless DC motor control in machine tool, electronic lighting, welding equipment, and automatic locks, among other applications. Other common applications include monitoring of temperature changes, HVAC operations, lighting systems, as well as surge and lighting protection.

The working principle of the FOD4218S optoisolator is based on the relay principle. It creates electrical isolation between the two electrical circuits by using a photosensitive Triac or SCR output that senses the electrical voltage generated by the light emitting diode (LED). The emitted light is then converted into an electrical voltage which is used as an input signal for the load. As an electronic switch, it can be used to protect circuits from transient overvoltage and to provide reliable switching operations.

The FOD4218S optoisolator has an operating temperature range from -40C to 105C, an isolation voltage rating of 4,000 Vrms, and a breakdown voltage of over 200V. It features low power consumption, fast switching time and reliable operation. The package dimensions are 4.9 x 3.2 x 0.8 mm, with a total weight of 2.5g. It has a switching current capacity of 0.3A and an off-state voltage of less than 0.2V.

The FOD4218S optoisolator provides an effective solution for utilizing isolated and robust switching and controlling AC loads. It offers superior electrical isolation with protection from electrical noise interference, transient overvoltage and provides reliability in switching operations. Moreover, it has a wide range of application and a fast switching time for improved performance.

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