MOC8101X

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Optoisolators - Transistor, Photovoltaic Output are components that transmit electrical signals between two isolated states while isolating one from the other. These isolators are often used to isolate and protect sensitive equipment from input signals containing high voltage, and to provide signal transmission between two systems with differing signal levels and or protocol. The MOC8101X is a triple opto-isolator designed for the isolation of high common-mode voltages. It includes an LED, optically coupled to a photo-transistor output. The MOC8101X is composed of a high-speed, high power bipolar silicon-controlled rectifier (SCR) and a red-light emitting diode (LED) connected in inverse parallel.

The MOC8101X carries a wide operating temperature range of -40°C to 85°C, a continuous current transfer ratio (CTR) of 2000% or greater, and a peak voltage of 200V. It is composed of two monolithic integrated circuits, and its insulation is achieved through the use of a transparent insulating epoxy package. This makes the MOC8101X ideal for applications such as industrial automation, automobile, and appliance control.

The working principle behind the MOC8101X is based on the use of an LED, optically coupled to a photo-transistor output. When a current, usually digital, is applied to the anode of the LED, current is transferred through the LED and across it to the output gap region. In the output gap region, the phototransistor is conductive, and gate current is generated, allowing current to flow from the collector to the emitter of the phototransistor. When the gate current is increased, the internal gain of the phototransistor increases, increasing the amount of current that can be created.

Other features of the MOC8101X include its ability to provide good filtering of low-frequency signals, its extremely low leakage current, its EMC immunity, and its short circuit protection. It also has a high common-mode rejection ratio (CMRR) of 1000V/m. A high CMRR is essential as it helps ensure that signals transmitted over the optoisolator remain electrically isolated and uninterfered.

MOC8101X has a wide array of applications and can be used in a variety of industrial, automotive, and appliance control systems. Its isolation feature makes it a great choice for protecting sensitive equipment from high voltage input signals. MOC8101X can also be used in optical wireless communications, as well as for signal transmission between two systems with various signal levels and protocols. Its built-in internal feedback system and its short circuit protection makes the MOC8101X a great choice for applications requiring reliable isolation between two systems.

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