SI8621AB-B-ISR

Common Mode Transient Immunity (Min):	35kV/µs
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply:	2.5 V ~ 5.5 V
Rise / Fall Time (Typ):	2.5ns, 2.5ns
Pulse Width Distortion (Max):	25ns
Propagation Delay tpLH / tpHL (Max):	35ns, 35ns
Data Rate:	1Mbps
Series:	Automotive, AEC-Q100
Voltage - Isolation:	2500Vrms
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:	Active
Packaging:	Tape & Reel (TR)

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Introduction to Digital Isolators
Digital isolators are electronic components used to provide a barrier between two systems of different potentials. They typically provide a two-way communication bridge between the two circuits and provide galvanic isolation. This isolation prevents any voltage or current from passing between the two circuits, which prevents interference or ground loops. By enabling isolation, digital isolators can protect one system’s input from another system’s output, as well as protecting both systems against arbitrary mutual voltage and current levels. This facilitates operation of other components connected to or through the isolator since it eliminates the risk of damage caused by the other system.
SI8621AB-B-ISR Application Field and Working Principle
The SI8621AB-B-ISR is a type of digital isolator specifically designed for the industrial sector. This device has a working voltage of 24-30V AC/DC for mains voltage input and 12V DC for low voltage input. It is designed to provide galvanic isolation between the I/O cables and the system, thus providing a safe operating environment for the components on either side of the isolator. The SI8621AB-B-ISR also provides high-speed signal transfer for I/O signals, with a speed of up to 1MHz and a signal bandwidth of 300kHz. Additionally, this isolator offers excellent transient immunity, operating temperatures from 40°C to +85°C, and a very low quiescent current.The SI8621AB-B-ISR utilizes a combination of a gallium-arsenide (GaAs) internal oscillator and a custom ASIC to provide the aforementioned features. The oscillator provides a reference frequency of 3.84MHz, which is used by the ASIC to compare against a supplied system clock signal. The ASIC then determines whether a high or low level signal is to be transferred from one side to the other, and based on the comparison result, either sends a high or low-level signal to the opposite side of the module. As a result of this process, the two sides of the circuit are able to communicate safely and without interference, and the system benefits from galvanic isolation to ensure that no voltage or current is passed.
Conclusion
In summary, the SI8621AB-B-ISR is a digital isolator specifically designed for the industrial sector. It provides galvanic isolation to protect one system’s input from another system’s output, as well as protecting both systems against arbitrary voltage and current levels. Furthermore, it offers excellent signal transfer speed and transient immunity, and operates at a wide temperature range. Finally, the combination of a GaAs oscillator and custom ASIC are used to provide effective isolation and communication between the two sides of the circuit.

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