TCET1105G

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The TCET1105G is a transistor output optoisolator designed for applications requiring a high noise immunity, and physical separation between electrical circuits. It utilizes an integrated optoisolator with a photocoupler formed between a gallium arsenide infrared LED and a phototransistor. This optoisolator’s physical separation between input and output circuits make it especially useful for transmitting signals from one side of a noisy environment to another, with minimal signal degradation.

The TCET1105G’s photocoupled compound structure permits high-speed response while achieving electrical isolation between input and output circuits. An optically coupled optoisolator structure is built into a compact package, and the LED and phototransistor are both enclosed in a clear plastic material, allowing light transfer between them for the signal transmission process. The LED portion of the device is driven by the input signal, while the phototransistor section is the output. The integrated amplifying and level-shifting circuit of the external photo transistor allows the device to meet the voltage criteria of the circuit board. Since the LED and phototransistor are shielded from the external environment, the output is not affected by the current or voltage levels of the input.

The phototransistor is isolated from the LED by a thick black rubbery sheet. This sheet prevents electrical interference from reaching the phototransistor, allowing better signal control and improved noise margin. The optoisolator also comes packaged with a device-level overload protection to guard against voltage surges. Additionally, a small amount of current control is provided by the onboard amplifier, allowing the user to adjust the power consumption and the output level.

The TCET1105G is designed for use in many applications where isolation is desired. This optoisolator can be useful in automotive applications, such as in airbag systems, power window control systems, and ECUs. It is also used in industrial and consumer applications, as well as high-voltage applications like HVAC and power systems.

In summary, the TCET1105G is a high-speed optoisolator that provides electrical isolation and noise immunity between input signals and output circuits. It is capable of providing high reliability and a robustness that is invaluable in many application areas. The dense structure and efficient nature of the optoisolator make it attractive for its cost-effectiveness and performance.

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