LTV-247 Isolators

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Optoisolators are an important category of electrical isolation components that integrate LED and photodiodes in one package for use in modern electronic systems. The LTV-247 is one such opto-isolator, a type of opto-coupler device, which uses a light-emitting diode (LED) to provide a photocoupled barrier between two interconnected circuits, allowing for electrical isolation of the two devices. The LTV-247 is a three-terminal 4-pin opto-isolator with an output transistor, photovoltaic output, providing complete electrical isolation elimination.

The LTV-247 has a wide range of applications in the electronics field. In some cases, the application requires the protection of a low voltage circuit from high voltage surges. In other applications, the security of a digital circuit can be protected from analog signal interference. This opto-isolator can also be used for interface isolation between, for instance, a microcomputer to transducer, optical interrupter to DC motor, operational amplifier to TTL circuits, or pulse generator to analog circuits. In addition, it can be used as an isolator in alarm systems, computer circuitry, and communication equipment.

The device consists of an infrared light-emitting diode and an optically coupled NPN silicon phototransistor in a single package. An LED is used to emit light when energized with current, and the light is detected by a sensitive phototransistor. The transistor is isolated from the LED in order to completely isolate the two circuits. As a result, the transistor will activate when the LED is energized, allowing current to pass through its base and emitter junction.

The bipolar structure of the LTV-247 optoisolator allows it to provide an output with logic levels. The LTV-247 has a relatively fast response time, plus a wide range of operating supply and output voltages. Its response time is around 150ns, with supply voltage ranging from 4.5 V to 24 V, and with output voltage ranging from 0.1 V to 25 V. It operates at currents between 25 mA and 20mA. Its fan out can handle up to 25 input and output pins.

LTV-247 operates in four modes, which can be used to reduce noise or maintain reliable operation: normal cutoff, inverted cutoff, saturation, and inverted saturation mode. Each mode is useful in different types of applications. In normal cutoff mode, the transistor is off when the LED is on; in inverted cutoff mode, the transistor is on when the LED is on; in saturation mode, the transistor is on when the LED is off; and in inverted saturation mode, the transistor is off when the LED is off.

The LTV-247 uses a light-sensitive phototransistor in combination with an LED to provide a reliable electrical barrier between two circuits. The opto-isolator has a-fast response time and a wide range of operational voltages, as well as four different operating modes. This opto-isolator is suitable for applications such as interfacing between microcomputer and transducers, optical interrupters and DC motors, operational amplifiers and TTL circuits, as well as for providing secure alarm systems, computer circuitry, and communication equipment.

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