MOC8021S

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Optoisolators, or optocouplers, are a class of devices commonly utilized in electronics to electrically isolate components from one another, making them useful for a variety of applications. In this article, we will review the application field and working principle of the MOC8021S optoisolator. This product belongs to the Transistor, Photovoltaic Output type.

The primary use of the MOC8021S optoisolator is for isolating inputs and outputs for interfacing circuits. This makes the device ideal for protecting sensitive circuits, such as microcontrollers, from voltage spikes caused by programming errors or lightning strikes. It is also ideal for protecting more expensive components, as it can handle up to 8.0A of current.

The MOC8021S features a 6-pin package, with one side being an input terminal and the other side being an output terminal. The device features two photovoltaic cells, one that acts as the input, and one that acts as the output. The photovoltaic cell for the input side is known as a photocoupler, and is attached to the control circuit, while the photovoltaic cell for the output side is known as a photodetector. This photodetector is connected to the protected circuit.

When there is no voltage applied to the input side, both of the photovoltaic cells are off, and no current is flowing. When a voltage is applied to the input, the photocoupler reacts and emits photons, which is then absorbed by the photodetector. This causes a current to flow through the photodetector, and in turn, through the protected circuit. When the voltage is removed, the photocoupler stops emitting photons, and the photodetector stops conducting current.

The MOC8021S is designed to have an operating temperature range of -40°C to 105°C, and is rated for working voltages up to 400V AC or DC. The LED light output is at a 650nm wavelength. The response time of the device is between 2us to 4us, depending on the load current. The device is also UL and VDE approved, with a current transfer ratio of 1000:1 and a dielectric strength of 4000Vrms.

In summary, the MOC8021S optoisolator is ideal for isolating inputs and outputs for interfacing circuits, providing protection from accidental voltage spikes or electrical noise. The device features a 6-pin package, two photovoltaic cells, an operating temperature range of -40°C to 105°C, and a response time of 2us to 4us. The device is UL and VDE approved, and features a current transfer ratio of 1000:1 and a dielectric strength of 4000Vrms.

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