SFH690ABT

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Optoisolators, such as the SFH690ABT, are an electronic component used to effectively isolate two circuits electrically while allowing them to communicate optically. This allows the two circuits to operate independently, providing protection against electrical interference in applications such as data or signal transmission. The SFH690ABT is a Transistor, Photovoltaic Output type Optoisolator, which uses a phototransistor to convert an optically generated signal into an electrical output.

The SFH690ABT is most commonly used in interface and communications applications. It has a wide operating supply range of 2.5V to 24V, making it well suited for use in intermittent duty automotive and commercial applications such as signal relays, SCR and TRIAC triggering, and as protective isolators in electrical equipment. It has an LED forward current of 10mA, a transistor collector-emitter peak off voltage of 60V and a collector dark current of 1µA. The device is rated to be capable of passing up to 600V of transient surge current.

The working principle of the SFH690ABT is that of a standard Optoisolator. When an electric current passes through the LED component, the LED emits light. This light travels through the gap in the plastic encapsulation and is detected by the phototransistor inside. The phototransistor then converts the optical signal into an electrical signal and provides an output to the circuit connected to its collector pin. Depending on the input voltage, the output voltage will vary between 0V and the supply voltage.

The SFH690ABT is a reliable and versatile optoisolator suitable for a variety of fields. Its wide operating voltage range makes it suitable for use in many types of applications, including automotive electronic systems, industrial and commercial controllers, medical and security control systems and more. The device’s high surge and transient voltage ratings make it well suited for protecting sensitive circuits from damaging electrical interference, making it an essential component for many industries that rely on the transmission of digital data and signals.

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