SI8420AB-D-ISR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Not For New Designs
Technology:	Capacitive Coupling
Type:	General Purpose
Isolated Power:	No
Number of Channels:	2
Inputs - Side 1/Side 2:	2/0
Channel Type:	Unidirectional
Voltage - Isolation:	2500Vrms
Common Mode Transient Immunity (Min):	25kV/µs (Typ)
Data Rate:	1Mbps
Propagation Delay tpLH / tpHL (Max):	35ns, 35ns
Pulse Width Distortion (Max):	25ns
Rise / Fall Time (Typ):	3.8ns, 2.8ns
Voltage - Supply:	2.7 V ~ 5.5 V
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC

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Introduction to Digital Isolators GraphDigital isolators are electronic devices used to safely transfer digital signals and power between circuits. This enables data signals and power to pass freely, while protecting both the sending and receiving circuits from external influences. Digital isolators provide galvanic isolation, ensuring that the two circuits are electrically isolated from each other. This is important because it prevents the two circuits from being affected by external electromagnetic or electrical interference, which can cause data loss and other problems.The SI8420AB-D-ISR is a digital isolator developed by Silicon Laboratories. It is a low-power, low-voltage, unidirectional isolator that safely transfers the digital logic signals from one side of an isolation barrier to the other.Applications of the SI8420AB-D-ISR The SI8420AB-D-ISR is typically used in systems that need isolation protection such as sensors, motor drives, and medical systems. It is especially useful for medical equipment applications due to its low-power consumption, low voltage operation, and immunity to external noise.Additionally, the SI8420AB-D-ISR can be used in communication systems, computer systems, and industrial networks. In these applications, it provides electrical isolation between the data communications circuitry and the system’s power supply, enabling the two circuits to operate independently without affecting the other.Working Principle of the SI8420AB-D-ISR The SI8420AB-D-ISR digital isolator works by transferring digital signals across an isolation barrier using a transformer core. This core, combined with high-speed, low-power switching transistors, is used to transfer the digital signals from one side of the barrier to the other.In order to achieve this isolation, the SI8420AB-D-ISR uses a unique method of detection. Its isolation barrier is made up of an opto-isolator, which consists of a light emitting diode (LED) and a phototransistor. When the LED is switched on, it emits a light pulse that is detected by the phototransistor on the other side of the barrier. This is then used to detect any changes in digital logic signals, and transfer them across the barrier without any deterioration. The isolation provided by the SI8420AB-D-ISR separates the input signal and the output signal. It also provides protection against arcing and short-circuits. Conclusion The SI8420AB-D-ISR is a digital isolator developed by Silicon Laboratories. It is capable of safely transferring digital logic signals across an isolation barrier while providing electrical isolation and protection against external interference. It is typically used in industrial networks, medical systems, and computer systems, and is especially useful due to its low-power consumption, low voltage operation, and immunity to external noise.

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