ISO7742FDWR

Common Mode Transient Immunity (Min):	85kV/µs
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 125°C
Voltage - Supply:	2.25 V ~ 5.5 V
Rise / Fall Time (Typ):	2.4ns, 2.4ns
Pulse Width Distortion (Max):	4.9ns
Propagation Delay tpLH / tpHL (Max):	16ns, 16ns
Data Rate:	100Mbps
Series:	--
Voltage - Isolation:	5000Vrms
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:	Tape & Reel (TR)

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Digital Isolators: ISO7742FDWR application field and working principle

Digital isolators, which have the ability of providing galmourous electrical insulation for electric security, have been widely used for their advantages like high reliability and low power consumption. Among these digital isolatorproducts, ISO7742FDWR series digital isolation devices are one of the most popular products to help engineers with their designs. This paper will analyze ISO7742FDWR\'s application field and its working principle.

Application Field of ISO7742FDWR Series Digital Isolation Devices

ISO7742FDWR series digital isolation devices are one perfect components that feature integrated isolation elements, including one capacitive isolation ceramic body. It is used in system-level isolation system designs most times, especially those that have comparatively high power dissipation or require wider working temperature range. This series of digital isolation devices can be divided into two types: The ISO7742FWR is a high temperature (up to 150℃) digital isolator, and its key feature is wide-temperature working, which is extremely useful in either power or automotive industry. It could reduce the electronic noise, and operate with different voltage levels and communications format at the same time.The ISO7742FDWR is a low temperature(up to 105℃) digital isolator. It has higher noise immunity and better contact than its other digital isolator series, so it is especially used for complex and sensitive applications.

Working Principle of ISO7742FDWR Series Digital Isolation Devices

The ISO7742FDWR series digital isolation devices are based on the capacitive coupling technique. This technology uses the principles of capacitive coupling to separate two electrical circuits, which isolates the two circuits by up to 15KV of electrostatic shielding. This separation is achieved by the isolation body material, which is typically a dielectric material having a dielectric constant significantly higher than air. This material is placed between two electrodes: one connected to each circuit. An oscillating voltage applied across the electrode will create an electrostatic field through the isolation. This electrostatic field will be coupledto each of the two circuits. The information that has been transmitted will then be transmitted through this electrostatic field and passed through the isolation material, which is isolated from the direct interaction between the two circuits. However, it should be noted that this transmission is not capable of powering a device as it\'s a unidirectional transmission that can only be used for data and signal transmission.

Conclusion

ISO7742FDWR series digital isolation devices are very valuable when it comes to system-level isolation system designs. With their high temperature or low temperature working modes, wide temperature range, good noise immunity and better contact characteristics, they are just what engineers need when they wish to secure sensitive electric signals. Their working principles, based on the capacitive coupling technique, can effectively separate two electrical circuits without difficult wiring. Thus, ISO7742FDWR series digital isolation devices are definitely the optimal choice when it comes to isolating sensitive electric signals.

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