SFH 309-4 RN18A

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The SFH 309-4 RN18A is a phototransistor device, specifically an optocoupler featuring a light emitting diode (LED) integrated by a silicon NPN transistor with an integrated collector-emitter voltage of 50V. It has a typical rise time of 30 microseconds and a typical collector-emitter saturation voltage of 2.0V, making it an ideal choice for applications in the millisecond response time range. The NFH 309-4 RN18A is a relatively small phototransistor, measuring 5.23 x 4.45 x 1.78 mm.

Applications

By providing a reliable isolation between two circuits, the SFH 309-4 RN18A can be applied in various industries such as medical devices, aerospace, robotics, and automotive. It is especially well known and highly valued for its fast switching speeds, making it able to be used in high-frequency switching applications such as power line transducers and DC-DC converters. Additionally, the SFH 309-4 RN18A\'s small size and low EMI susceptibility make it ideal for space-restricted applications, such as handheld or embedded systems. The SFH 309-4 RN18A is also suitable for use in motion detection, and for laser diode high power applications.

Working Principle

The SFH 309-4 RN18A operates on a simple principle which is known as the photoelectric effect. When exposed to light, electrons are emitted from a light-sensitive material. These electrons are collected by a set of electrodes called a photoconductor. The electrons flow through the electrodes and generate an electrical current. This current can be used to control a variety of different electrical components, or it can be used to measure light intensity. The SFH 309-4 RN18A utilizes this effect by integrating an LED onto the same chip as a NPN transistor. When exposure to light is detected, the LED emits light which is then transferred to the integrated NPN transistor, producing a current which can be used for a variety of applications.

Conclusion

The SFH 309-4 RN18A is an optocoupler featuring a light emitting diode (LED) integrated by a silicon NPN transistor with an integrated collector-emitter voltage of 50V. This device can be used for a variety a applications due to its fast switching speeds, small size, and low EMI susceptibility. It operates on the simple principle of the photoelectric effect, generating electrical current when exposed to light. The SFH 309-4 RN18A is an ideal choice for applications in the millisecond response time range, especially where restriction of size and electromagnetic interference is required.

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