SI88621BD-IS

Common Mode Transient Immunity (Min):	40kV/µs
Supplier Device Package:	20-SOIC
Package / Case:	20-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply:	3 V ~ 5.5 V
Rise / Fall Time (Typ):	2.5ns, 2.5ns
Pulse Width Distortion (Max):	4.8ns (Typ)
Propagation Delay tpLH / tpHL (Max):	12.6ns, 17.5ns (Typ)
Data Rate:	100Mbps
Series:	Automotive, AEC-Q100
Voltage - Isolation:	5000Vrms
Channel Type:	Unidirectional
Inputs - Side 1/Side 2:	1/1
Number of Channels:	2
Isolated Power:	No
Type:	General Purpose
Technology:	Capacitive Coupling
Part Status:	Not For New Designs
Packaging:	Tube

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Digital Isolators

SI88621BD-IS is an optically-isolated digital isolator designed for applications which require a high degree of limit current, safety, reliability, and a wide temperature range from -40°C to +105°C. It can be used for a variety of digital applications, including voltage and current sensing, power supply isolation, and high-speed data interfaces. It provides an interface between analog and digital circuits, as well as a medium that allows signals to pass through with little distortion.

Application Field

SI88621BD-IS can be used in industrial automation and motor control, medical devices, audio and video systems, automotive, and consumer electronics applications. Additionally, its isolators are suitable for use in a variety of circuits, including voltage and current signal conversion, high-speed transmission of data and integrated circuits, and motor control applications. It is particularly well-suited for use in automotive and safety-critical applications due to its wide temperature range and extremely durable construction.

Working Principle

SI88621BD-IS works on the principles of optical isolation. The chip isolates signals between circuits, or between a circuit and a computer, using infrared light emitted from a gallium arsenide light-emitting diode (LED) on one side of the chip and a photodiode on the other side of the chip. An electric field exists between the two sides of the chip. This field produces photons, which are then detected by the photodiode and converted into an electric signal. This signal is then transferred through a logic circuit to the output, providing electrical isolation between the input and output.The photodiode on the chip is sensitive to light, so it will be affected by ambient light. To solve this problem, the chip is designed with a light-shielding layer that blocks ambient light from entering the chip and causing interference. SI88621BD-IS uses low-voltage differential signaling (LVDS) technology to transmit data. This technology reduces jitter, interference, and noise, allowing for higher data transfer rates. Furthermore, it minimizes power consumption and eliminates distortion in the signal. The chip is also designed with an adjustable termination resistor, which helps to reduce power consumption.In addition, the chip is equipped with a built-in ESD protection circuit. This circuit helps to protect the device from electrostatic discharge, ensuring reliable operation and long-term stability.

Conclusion

SI88621BD-IS is a versatile digital isolator designed for applications which require high levels of safety, reliability, and a wide temperature range. It works on the principles of optical isolation, using a combination of a gallium arsenide LED, a photodiode, and a logic circuit to provide electrical isolation. Additionally, it employs LVDS technology to transfer data, and its built-in ESD protection circuit provides reliable operation and long-term stability. This isolator is suitable for use in a variety of industrial, automotive, medical, and consumer electronics applications.

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