MOC8021W

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Optoisolators, also known as optocouplers, have been deployed by providers of safety-critical hardware and software components for years, seeking to prevent cross-talk that could lead to errors in data and communication signals. The MOC8021W optoisolator is a particularly incredible example of an optocoupler offering photo-high voltage isolation, high CMR (Common Mode Rejection), linear current transfer and a very fast response time for photo MOSFET output applications. In this article we will take a look at the MOC8021W application field and working principle to better understand how it is used.

The MOC8021W can be used in virtually any application that requires optical isolation from a single light-emitting diode. It is suitable for use in automotive and industrial systems as well as consumer electronics and medical applications. This includes automotive ABS systems, as well as mobile phones, personal computers, DVD players, digital cameras, sensors, and a plethora of other devices. This device is incredibly versatile, allowing it to be tailored to fit nearly any need.

The MOC8021W is extremely reliable and delivers high common-mode noise immunity, with a typical CMR of 19.3 dB for up to 6.5 mA input current. The response time is ultra-fast, typically 85 ns, and even faster with fast switching control. It has a maximum supply voltage of 5.5V, and the input and output pins are both differential, for added noise reduction. The device is contained in an industry-standard, 6-lead, 0.2 inch DIP package which is simple to mount to any printed circuit board.

The MOC8021W is a photovoltaic optocoupler, meaning it uses a photodiode to convert an optical signal to an electrical signal. The photodiode is in the optocoupler’s internal optoelectronic shield, converting an input signal to an electrical current. This electrical current is then manipulated by a transistor, buffered or amplified and then sent to the output pins of the optocoupler. An NPN type transistor is used in the optocoupler, meaning that the collector operates at a voltage which is lower than the base voltage, resulting in the output voltage being lower than the input voltage.

The MOC8021W is an optocoupler designed for safety-critical applications, offering superb noise and transient immunity. It is designed for light-activated switches, analog circuits, display drivers, and other applications where ultrafast response and superior CMR (Common Mode Rejection) are required. The ultrafast response and high CMR allow for switching speeds that are tailored to the application and offer superior noise immunity, while still maintaining a wide safety margin.

The MOC8021W also has a wide operating temperature range of -40°C to 85°C, which is great for applications that require extreme environmental conditions. This temperature range allows the optocoupler to function in a wide variety of industrial and automotive applications, providing the utmost reliability and safety. The pin-compatible design and small dimensions also make it a great option for applications where space and board size are a premium.

In conclusion, the MOC8021W is an incredibly versatile optocoupler that can be used for a variety of applications. It features a fast response time, superb noise and transient immunity, a wide temperature range and a small size, making it an excellent choice for applications requiring optical isolation. The device is extremely reliable and comes in an industry-standard 0.2 inch DIP package, which makes it easy to mount to any printed circuit board.

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