H11B255W

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Optoisolators - Transistor, Photovoltaic Output - use a light-emitting diode (LED) and a phototransistor or photo-voltaic device as components. The LED emits light when the input power supply is on, and the phototransistor or photo-voltaic device detects the signal light and produces the electrical output. The LED and phototransistor or photo-voltaic device are then mounted in a single package thus providing electrical insulation between the input and output signals. This technology is used for the transmission of signals or data between isolated circuits.

An optoisolator like the H11B255W works on the principle of photogeneration, that is, when a voltage is applied across an LED, electrons recombine within the LED to produce photons or light. The light emitted by the LED, when detected by a phototransistor or photo-voltaic device causes a current flow in the phototransistor or photo-voltaic device and this current is collected on the other side of the optoisolator. This current is then used to control a transistor switch or a relay which may be connected to some other device. The H11B255W has a direct photocoupled floating signal and it is non-polarised, making it suitable for use in both positive and negative voltage systems.

The H11B255W is a 5V, 0.5A optoisolator and it is particularly suitable for industrial and automotive applications. In industrial applications, it is used as a level controller or signal isolator, providing electrical insulation between input and output signals. In automotive applications, it is used as a circuit protection device, providing protection against short circuits and overcurrent. Moreover, the optoisolator also provides protection against electromagnetic interference (EMI) and radio-frequency interference (RFI).

The H11B255W has three terminals - an LED pin, a phototransistor or photo-voltaic device pin, and a common terminal. The LED pin is connected to the input signal and the phototransistor or photo-voltaic device pin is connected to the output. The common terminal serves as the collector for the phototransistor or photo-voltaic device to ground. When the input signal is applied to the LED pin, the LED emits light, and this light is detected by the phototransistor or photo-voltaic device pin, producing an electrical output. This electrical output can then be used to control a transistor switch or a relay, or the signal can be further amplified using an amplifier.

The H11B255W offers a wide range of applications due to its low power consumption, wide temperature range, and high isolation. It is also capable of data transmission over longer distances, and is highly reliable due to its small size and light weight. The H11B255W also helps reduce EMI and RFI interference, making it suitable for use in harsh environments and in applications that require high level of electrical insulation between input and output signals.

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