FOD0738R1 Isolators

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Optoisolators - Logic Output: FOD0738R1 Application Field and Working Principle

Opto-isolators, also known as opto-couplers or photocouplers, are electrical devices that use optical isolation systems between two electrical circuits to provide insulation and safety. Opto-isolators are widely applied in industrial automation, instrumentation and consumer-electronics fields. The FOD0738R1 is a logic-level output opto-isolator with a transistor output. It can be used to prevent voltage surges from affecting the performance and safety of delicate electrical circuits.

The FOD0738R1 opto-isolator contains a light emitting diode (LED) and a photo-sensitive transistor. It has a response time of 2.0 microseconds maximum and a isolation voltage of up to 3500Vrms. It is housed in a 4-pin TSSOP-14 package and operates within the temperature range of 0℃ to +70℃. It uses an SMT package for easy handling and is made of a highly reliable polymer material. The FOD0738R1 is available in both DC and AC input modes.

The FOD0738R1 has a wide range of applications. It is mainly used in applications that require electrical isolation or surge protection. It can be used to isolate low-level logic signals, such as those found in microcontrollers or a logic control device. The FOD0738R1 can also be used to isolate an audio signal from a sound card or active low-level signals from a DC motor. It is also used as a relay driver or signal amplifier for relays, motor controllers or analog converters.

The working principle of the FOD0738R1 is based on the optical operating principle of a photo-transistor. When the input voltage is applied, the photo-sensitive transistor absorbs light energy, which is produced by the LED. The transistor then acts as an amplifier to control the output of the opto-isolator. The output voltage is regulated by the input signal, which is depended on the switching frequency and the forward voltage of the LED. The output of the transistor is also affected by the voltage drop across its base-emitter junction, which is inversely proportional to the LED current.

In conclusion, the FOD0738R1 is a logic-level opto-isolator specifically designed for electrical isolation and surge protection. It is used in a wide range of applications, such as audio signal isolation, logic control, relay drivers, signal amplifiers and more. The working principle of the FOD0738R1 is based on the optical principles of a photo-sensitive transistor, which produces a regulated output voltage based on the input voltage applied to the LED.

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