EL817(S)(C)(TA)

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Optoisolators, also called optocouplers or optically coupled isolators, are specialized interfaces that are used to electrically isolate input signals from output signals. They involve a light-emitting diode (LED), usually near infrared, coupled to a photosensitive element such as a phototransistor. The EL817 is a type of optoisolator device that uses four leads, two for signal input and two for signal output, and is specifically designed as a Transistor - Photovoltaic Output device. It functions as an electrically separated amplifier that is utilised in applications such as power monitoring, motor and actuator control, alarm systems, and micro isolation.

The EL817 incorporates active optoelectronic elements to achieve insulation between signal sources. Its core is an LED light source that is optically coupled with a silicon NPN phototransistor. It is typically used to transfer an electrical signal from a low-power circuit to a higher-power circuit. When the LED is illuminated, it emits light particles (photons) which are then detected by the phototransistor, ultimately providing the drive current and activating the output. The reverse direction of the input can be accomplished by reverse-biasing the phototransistor gate. It acts as an electronic switch with low leakage, low input resistance, and low input capacitance.

The EL817 is suitable for DC level isolation applications, including amplifier and driver circuits, as well as digital, analogue, and power signals. It can be used as a signal coupler or driver, and can also provide logic isolation. Its primary purpose is to prevent high-impedance input signals from interfering with high-power output circuits. It features a wide operating temperature range, low power consumption, and high-speed switching capabilities.

In terms of its specifications, it has a maximum forward voltage of 2 volts, peak current of 100 milliamps, and forward operating current of 10 milliamps. It operates at 0.1 watts of power, has a frequency range of 10 to 100 kHz, and a max switching power of 350 mW. Its operating temperature range is -30 to 80 degrees Celsius, and its output current is rated between 10 and 20 mA. It also offers a high insulation voltage of up to 8 kV, as well as a high CMR (common mode rejection ratio).

The EL817 is a versatile optoisolator device with numerous applications in both industrial and consumer electronics. Furthermore, its combination of electrical insulation and signal coupling capabilities makes it suitable for a wide range of power monitoring, motor control, alarm systems, and micro isolation requirements. It is resistant to electromagnetic interference in extreme temperatures, and its long life of up to 100,000 hours operation further makes it a dependable and economical solution for any optocoupler applications.

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