H11A3SR2M

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Optoisolators - Transistor, Photovoltaic Output

H11A3SR2M (hereinafter referred to as H11A3SR2M) opto-isolator is a transistor photovoltaic output opto-isolator with a guaranteed CTR (Current Transfer Ratio) between 10% to 600%, a typical output current of 20mA, and a working voltage range of 5-30V. It is widely used in various applications and provides reliable electrical isolation between input and output.

Application

H11A3SR2M can be used to isolate the high-speed communication in the industrial control field, the signal transmission in the field of motor control and signal transmission in the automotive field. In addition, H11A3SR2M often used in microcontroller systems, high-voltage pneumatic systems, computer peripheral interface, audio and video systems and light control systems that need high-speed data transmission, such as aviation, aerospace, medical, security and automation applications.

Working Principle

H11A3SR2M is a transistor photovoltaic opto-isolator, that transmits electrical signals between two electrically isolated circuits by using an LED (Light Emitting Diode) to generate light, and a phototransistor to convert the light back into an electrical signal. The LED is coupled to an input circuit, and the phototransistor is coupled to an output circuit with electrical insulation between them.

When a voltage (T VDD) is applied to the input side, the LED is turned on and emits light. The light is detected by the phototransistor, which is in the "off" mode under dark condition. When the phototransistor detects the light, it turns "on" and the current passes through the phototransistor, providing sufficient base current for the output transistor in the opto isolator.

The output current of H11A3SR2M is proportional to the input voltage T VDD. When the T VDD increases, the output current of the opto isolated transistor increases. The active LED has its luminescence intensity depending on the amount of current passing through, causing a change in the brightness of the LED. The phototransistor detects this change in brightness, and the output current is increased accordingly.

In addition, H11A3SR2M has better performances when compared with other opto-isolators in terms of its CTR (Current Transfer Ratio) and power. The CTR of H11A3SR2M ranges from 10% to 600%, which is wider than the typical ratios of other opto-isolators. The design of photovoltaic output also provides higher power than most opto-isolators and a longer life span as well.

Conclusion

H11A3SR2M opto-isolator is an ideal choice for applications where isolation, fast response, high current capability and wide CTR range are required. H11A3SR2M is widely used in industrial control, motor control, automotive, microcontroller systems, high-voltage pneumatic systems, computer peripheral interface, audio and video systems and light control systems applications. It can also provide a higher power and longer life span compared to other opto-isolators.

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