SFH 3400

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Optical Sensors - Phototransistors

Phototransistors are one of the most commonly used types of optical sensors. They provide light sensing capability to electronic devices by detecting and responding to light intensity. SFH 3400 series phototransistors, produced by Osram Opto Semiconductors, are a type of commonly used phototransistors in applications in consumer electronics, automotive as well as industrial applications.

Applications of SFH 3400 Series Phototransistors

The SFH 3400 series of phototransistors can be used in a variety of applications, such as providing light sensing and feedback in consumer electronics, lighting control systems, and measuring the brightness of an illuminated area. The SFH 3400 series phototransistors can also be used for computer mouse or keyboard sensor, linear array or matrix display applications, medical instrumentation, robotics and machine vision systems, automotive light sensors, and motion detection.

Working Principle of SFH 3400 Series

The SFH 3400 series of phototransistors are based on junction technology and use a silicon die as the light source sensing element. The interior and exterior surfaces of the die are protected by conductive epoxy to minimize inadvertent optical exposure and to increase stability. When illuminated, the transistor\'s interior junction absorbs the light and generates carriers (i.e electrons and holes). This increases the conductivity of the SFH 3400 series phototransistor, and a current flows through it.

Design Considerations with SFH 3400 Series Phototransistors

Designers must take into account several design considerations when using SFH 3400 series phototransistors. The most important consideration is to make sure that the phototransistor is operated in the linear region, as this will provide accurate and stable readings throughout its lifetime. It is also important to consider the mounting of the device, as different mounting configurations can affect the sensitivity to light. Additionally, adequate insulation may be necessary to prevent the device from picking up unnecessary electromagnetic signals. It is also important to use the appropriate PCB layout, as this can affect the devices’ response time. Finally, the selection of the appropriate phototransistor, such as the SFH 3400 series, is essential to achieve the desired results.

Conclusion

SFH 3400 series phototransistors are a very versatile and widely used type of phototransistor for applications in consumer electronics, automotive, and industrial applications. They feature junction technology, an interior die, and can operate in the linear region for accurate and stable readings. Designers must consider several design considerations before using the SFH 3400 series phototransistors, such as the mounting, insulation, PCB layout, and the selection of the appropriate device.

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