EL817(S)(TD)-V

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Optoisolators are widely used in digital and analog circuits to provide electrical isolation between power circuitry and data and control circuitry due to their low power consumption and good thermal stability. The EL817(S)(TD)-V is an optoisolator series in the Transistor, Photovoltaic Output category. It can be used for signal isolation, voltage conversion, speed detection, zero crossing and frequency monitoring applications.

The EL817(S)(TD)-V offers quiescent current operation of only 5µA, a low-level input current of 15µA, and a high-level input current of 15mA. It also sports a very low-voltage drop of around 0.3V at forward current of 1mA. This optoisolator is available with various lead configurations and package types and has a fixed LED current.

The EL817(S)(TD)-V optoisolator consists of an LED chip, an optically isolated phototransistor, and three terminals. The three terminals are the LED anode terminal (+), the LED cathode terminal (-) and the collector terminal (C). The operating voltage of the EL817(S)(TD)-V varies from 3V to 24V, depending on the package type.

The working principle of an optoisolator is based on a light-driven switch, using an LED and a phototransistor. The LED emits light when electricity passes through it. This light then falls on the phototransistor, which switches on. As the current passes through the phototransistor, a voltage drop is created across the collector terminal, indicating that the transistor is in its on state. As the light emitted from the LED is blocked or reduced, the photon transistors switch off.

An optoisolator helps isolate two different circuits or components from each other. This is accomplished by using a light-emitting element to control the switch of a phototransistor. In the EL817(S)(TD)-V optoisolator, this is the LED chip and the phototransistor, which is connected to the collector terminal. The current flow is allowed to pass through the LED’s anode and cathode, and the voltage drop across the collector terminal is used to detect the current.

The EL817(S)(TD)-V optoisolator’s applications include signal isolation, voltage conversion, speed detection, zero-crossing, and frequency monitoring. Signal isolation prevents noise or signals from entering a circuit from an external source, while voltage conversion is the process of converting AC to DC or vice versa. Speed detection is a method to detect the rate of rotation or frequency of a motor, while zero-crossing is used to detect the instances when the current waveform crosses zero. Frequency monitoring is used to measure the frequency of electrical signals in a circuit.

The EL817(S)(TD)-V optoisolator provides an electrical isolation between power and data or control circuitry, while also offering a low-voltage drop and high currents. Its applications include signal isolation, voltage conversion, speed detection, zero crossing and frequency monitoring.

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