EL3H4(EA)-VG

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Optoisolators - Transistor, Photovoltaic Output

EL3H4(EA)–VG is an opto-isolator, engineered to transfer electrical signals or information between two systems such as an electrical system with low voltage and sensitive signal and a system with high voltage components while keeping them isolated electrically. This type of opto-isolator combines a gallium arsenide (GaAs) LED and a single-channel MOSFET in a single package.

Applications Fields

EL3H4(EA)–VG opto-isolators are part of Vishay\'s optoSCALE family, used to perform high-speed switching without the need of external components. It is suitable for isolation and power switch control in automation applications. It has excellent uniformity with a high noise isolation and low saturation voltage across the portfolio. PC board mounting and a low 0.5 W total power dissipation make it crucial for communications networking, safety equipment, and automation control.

Other applications fields for the EL3H4(EA)–VG opto-isolator include Ethernet switch card, relay control, communication and signal control, diode/FET or logic control, amplifiers, and motor drives.

Working Principle

The working principle of the opto-isolator is relatively simple. The input, usually an electrical signal, is applied to the LED which turns the LED on. The light is then passed to a photosensitive device such as a photodiode, photo-FET transistor, or photo-triac, which then triggers the output device. The output device is isolated from the input side of the circuit, which prevents the electrical interference or current leakage which can occur in standard electrical circuits.

In this example, the EL3H4(EA)–VG opto-isolator is a single channel design, featuring an LED with a 5 mA to 25 mA current range, and a MOSFET with a 500 mA current range. The isolation voltage between the input and output is typically 4 000 V AC. The 0.5 W total power dissipation is due to the internal power consumption, although no external power is required.

Conclusion

EL3H4(EA)–VG opto-isolators are versatile devices, capable of performing high-speed switching in a number of applications. The device is capable of extremely low current leakage and large voltage isolation, providing excellent noise immunity and signal integrity. This makes it well-suited for environments where reliable signal transmission and electrical safety are required.

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