SI8642AB-B-IS1

Common Mode Transient Immunity (Min):	35kV/µs
Supplier Device Package:	16-SOIC
Package / Case:	16-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:	2/2
Number of Channels:	4
Isolated Power:	No
Type:	General Purpose
Technology:	Capacitive Coupling
Part Status:	Active
Packaging:	Tube

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Digital Isolators: SI8642AB-B-IS1 Application Field and Working Principle

Digital isolators are commonly used in applications such as motor control, audio systems, and medical equipment, allowing for the transfer of signals and data between two locations while keeping them electrically isolated. This prevents noise, spikes, or other disruptions caused by differential voltages from spreading and damaging other components.The SI8642AB-B-IS1 digital isolator chip is a single-channel, three-level isolation device from Vishay, specifically designed to switch and drive digital signals between circuit blocks with varying voltage levels. It is ideal for applications in which wide dynamic range and low propagation delay is required. Examples of such applications include industrial motor control, HVAC, and communication systems.

Electrical Characteristics

The SI8642AB-B-IS1 digital isolator chip features low propagation delay (250 ns typical), low current consumption (142 µA typical), high frequency operation (4 MHz typical), and wide input voltage range (3.3 V to 5.5 V). It also offers high common-mode transient immunity, which makes it well-suited for applications with fast switching signals and noise sources.

Signal Transmission

The SI8642AB-B-IS1 chip utilizes a three-level signal transmission system, which is composed of the two transmission channels and the isolator barrier. The transmission channels consist of two side-by-side copper traces, which act as the input and output lines for the device. The traces are connected to the isolator barrier, which is an insulation material between the two channels that prevents the signal from leaking to other channels. The signal from the input trace is first received at the receiver end of the device, where its voltage level is decreased by the level shifter circuit to make it compatible with the voltage of the output trace. The output signal then flows through the isolator barrier to the output trace, where it is sent out.

Protection

The SI8642AB-B-IS1 includes additional built-in protection to ensure that the device functions properly. These include protection against overvoltage, undervoltage, short-circuit, and overcurrent. It also features a CMOS input and a TTL output, which allows for easy interfacing with a wide variety of circuits.

Conclusion

The SI8642AB-B-IS1 digital isolator chip provides an efficient and reliable method for transmitting and receiving digital signals. Its three-level signal transmission system, low propagation delay, wide input voltage range, and built-in protection features make the device suitable for a variety of applications, including industrial motor control, HVAC, and communication systems.

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