SI8435BB-D-IS

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Digital isolators are electronic devices used to transmit communications between two circuits while providing physical separation between the two. The SI8435BB-D-IS is a digital isolator integrated circuit from Silicon Laboratories, Inc. that is commonly used in low voltage power management, Power over Ethernet (PoE) and low-speed USB applications. This product offers reliable data transmission and isolation between two circuits with a 3.75kV RMS isolation rating from channel to channel, and offers very high ESD protection, up to 8kV Human Body Model (HBM). Additionally, it has an operating temperature range of -40°C to +85°C, and is RoHS-compliant.

The SI8435BB-D-IS series is specifically designed for space-dependent applications where low voltage, high common-mode transient immunity, and low operating current are required. It has two independently-controlled digital inputs, and two independently-controlled digital outputs. The device is designed to provide noise immunity and distortion-free operation in noisy digital systems, and defaults to a logic high state during shutdown to prevent leakage current into the input. This product also offers a wide input voltage range from 1.8 to 5.5 volts, and the input and output stages are isolated from each other.

The working principle of the SI8435BB-D-IS digital isolator relies on a folded capacitor topology to provide high voltage differential isolation between the two channels. It uses a magnetic-coupled forward signal path with fast switching and an insensitive reverse path with low leakage current. The isolator utilizes a patented surface mount miniaturization process that reduces the size of the die package, resulting in a size of only 4mm x 4mm, while still providing high isolation performance.

The SI8435BB-D-IS is primarily used in applications where the isolation barrier is required to protect one circuit from another. It is commonly found in medical diagnostic systems, as well as portable communication and data acquisition systems. It is also used in motor control and power supply systems, providing increased safety and reliability. Additionally, it is used in switchmode power supplies, signal conditioning, active-sensing transducers, and motion controllers.

In conclusion, the SI8435BB-D-IS digital isolator is a small, low-voltage device that offers reliable data transmission and isolation between two circuits with a 3.75kV RMS isolation rating from channel to channel, and also offers very high ESD protection, up to 8kV Human Body Model (HBM). It is mainly used in medical diagnostic systems, power supply systems, and portable communication and data acquisition systems, providing increased safety and reliability. The isolator utilizes a patented surface-mount miniaturization process, reducing the die package size to only 4mm x 4mm.

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