H11L13S

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Optoisolators are used to reduce the interaction between two circuits, typically when one of the circuits is much higher in voltage than the other. Specifically, logic output optoisolators contain logic blocks separated from the circuit to be isolated, and they allow the transfer of digital information between two isolated circuits. The H11L13S is an optoisolator with logic output, suitable for the implementation of isolation between a µC and a digital circuit. This optoisolator uses an AlGaAs LED, with an 55mW DC operating power, capable of switching a maximum of 30 volts at 200mA. It has a dual inline package (DIP) type 4 pins and operating temperature from 0°C to 70°C. It is compatible with a TTL logic level, and a propagation time of 10 microseconds. This optoisolator can be used in safety limit monitoring, ac power supplies, signal isolation, data transmission, and other applications that require communication or control between two isolated circuits. The H11L13S optoisolator has a logic output, which works in an open drain configuration and requires an external pull-up resistor. The logic block is of CMOS technology, with an operating voltage from 4.5 to 30 VDC. The low input current value of 25mA enables the use of current limiting resistors, necessary for the protection of the LEDs. The operation of this type of optoisolator is based on the presence of an LED and a phototransistor, integrated in a single package. The logic level transmitted by the microcontroller charges the LED diode, stimulating the phototransistor. When the phototransistor is placed in avalanche mode, the output is connected to ground, and the external pull-up resistor provides the necessary pull-up current. The logic level output is determined by the state of the phototransistor. The prevalence of the logic output optoisolators over physical contact optoisolators is due to the elimination of contact bounce and arcing that can occur with physical contact relays during on/off switching. In addition, the absence of physical contact also eliminates the need for periodic maintenance or lubrication and extends the life of the optoisolator to several million operations. Beyond this, and with respect to application fields, the use of logic output optoisolators can be found in communication systems, with the objective of isolating digital signals between two circuits, and maintaining an extremely precise logic level. These optoisolators can also be used in digital data transmission applications, complementing the use of high-speed data transceivers, since these optoisolators can consume lower signal voltages and output digital signals with low noise interference. In addition, the logic output optoisolators can be found on industrial machinery, providing a safe signal transmission between two circuits. Generally, when an optoisolator is connected between the control panel and the system to be controlled, it eliminates the risk of high voltage currents across the control panel. In principle, most logic output optoisolators are powered by a DC/DC converter, however, the H11L13S can also be powered directly with a logic level, since it has an input voltage range from 4.5 to 30V. With respect to the output state, when the logic input is at logic 1, the output is pulled low to the ground, and vice versa. To summarize, the H11L13S is an optoisolator with logic output, suitable for the implementation of isolation between a µC and a digital circuit. This device has a TTL compatible logic level and open drain output, operating from 4.5 and 30V, assessing a current of 25mA. It can be used in several application fields such as communication systems, data transmission, monitoring, signal isolation, and industrial machinery. The advantage of this optoisolator is that it eliminates contact bounce and arcing, it eliminates the need for periodic maintenance, and it can be powered directly with logic level.

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