SFH615A-3X001

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Optoisolators provide a means of protecting critical components of circuits and systems from being exposed excessively to different electrical and environmental conditions. The SFH615A series optocoupler from SENSOR-TEC is an example of optoisolators that offer necessary isolation between electronic components on separate circuits. In this article, we will discuss the SFH615A-3X001 application field and working principle.

The SFH615A-3X001 family, available in both single-channel and dual-channel form, features a unique combination of current transfer ratio and common mode transient immunity. It provides 4 KV, reinforced isolation, making it suitable for use in communications, sensing, and medical equipment applications where high reliability and robust design are required. Its built-in voltage-limiting features allow it to be used in applications such as power meters, watt-hour meters, ground fault interrupters, and AC/DC converters. Furthermore, this device provides input-to-output isolation of up to 5 kVrms in both discontinuous and continuous mode.

The SFH615A-3X001 uses a photovoltaic output technology to provide a much-enhanced performance. This technology has an internal photodiode which makes its operation less sensitive to physical damage. This design also allows for reliability over a wide temperature range (up to 105 °C), as well as high current transfer ratio (up to 300% of maximum output current) and much better common-mode transient immunity.

The optocoupler consists of a transistor output stage which is optically coupled to the input side. When illuminated with an input current, the photo-diode conducts and triggers the output side transistor through an internal photo-transistor. This process enables the circuit to achieve a very high level of electrical isolation between the input and output stages. The transistor also helps in amplifying the signals and improving the circuit’s common mode rejection ratio.

The SFH615A-3X001 optocoupler is designed with major features such as high-temperature operation, fast response time, low power consumption, high noise immunity, and wide voltage input range (from 3.3 V to 56 V). Other features include high isolation breakdown voltage, coupled with low leakage current, improved EMC performance, high ESD protection capabilities, and extremely low VCE(sat) values. It also has an operating temperature range of -20 to 105 degrees Celsius. Its UL-recognized version complies with safety requirements and standards.

The SFH615A-3X001 optocoupler from SENSOR-TEC is a unique combination of features, making it an ideal solution for various demanding electrical and environmental conditions in industries such as communications, medical, sensing, power meters, watt-hour meters, and the AC/DC converter market. This device is well-suited for applications where high reliability and robust design are essential. It combines distinct features like fast response time, high temperature performance, and low power consumption. Its reinforced isolation makes it more reliable and dependable in terms of protection against voltage, electrical, and environmental stress.

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