EL3H4(A)(TB)-G

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Optoisolators are electronic devices used to transfer signals from a digital device to an analog device, and vice versa, without any electrical connection, providing isolation between the circuits. Isolation is important when signal common-mode voltage exceeds the breakdown voltage of the input logic. The EL3H4(A)(TB)-G is an optoisolator device that features a transistor photovoltaic output.

The EL3H4(A)(TB)-G optoisolator is a 4-pin device in a plastic, dual-in-line, DIP package. It features an Infrared LED emitter and a NPN silicon phototransistor detector. The emitter and collector terminals of the detector are connected by an internal impedance (typically 400Ω). It can provide signal isolation up to 7kV, with a CTR (current transfer ratio) of 40% minimum at 25°C. It has an operating temperature range from -55°C to 85°C and a storage temperature range from -55°C to 100°C.

The EL3H4(A)(TB)-G optoisolator operates using photovoltaic principle. When an LED is forward biased, it emits visible or infrared light. When a phototransistor is placed in the vicinity of the LED, the light will be absorbed by the phototransistor and the circuit current will start flowing from the emitter of the phototransistor to its collector. By properly setting the bias current of the LED, the current flow in the phototransistor circuit can be regulated. The biasing current of the LED is provided by the input signal applied to the control input of the optoisolator.

The EL3H4(A)(TB)-G optoisolator is used in various applications requiring electrical isolation, such as for protecting input circuits from over-voltage spikes, protecting digital logic from damaging accidental ground loops, and for interfacing different types of logic levels. It is also used in applications where low power consumption and low leakage current (micro amps) are required, such as in medical equipment, process control, data acquisition systems, industrial instrumentation, and automotive electronic systems.

In summary, the EL3H4(A)(TB)-G optoisolator is a transistor photovoltaic output device that features excellent impedance matching, wide variation in current transfer ratio, and high isolation voltage. It is suitable for use in various applications requiring electrical isolation, where low power consumption and low leakage current are required.

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