SI8645BT-IS

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Digital Isolators

The SI8645BT-IS is an advanced 4-channel digital isolator developed by Silicon Labs. It provides galvanic isolation technology that helps protect sensitive systems from electrical damage caused by inputs from harsh or unfamiliar environments. The device offers high-performance EMI (electromagnetic interference) protection for valuable systems and shields against overvoltages, noise, electromagnetic interference, and more, enabling reliable data transmission. The product is well suited for medical equipment, process control, power conditioning, renewable energy systems, electric vehicles, motor control, industrial automation, and any other applications that need reliable isolation.

The SI8645BT-IS is designed to provide 4-channel digital isolation for data-intensive systems, such as in industrial applications. The device includes four full channels of 4-kV isolation, with channel-to-channel and channel-to-ground isolation of up to 10 kV. Through its isolation barrier, the device ensures system voltage is maintained at a constant level, protecting downstream components from overvoltage, underestimated voltage, spikes, and noise.

Working Principle

The SI8645BT-IS utilizes transformer technology to ensure galvanic isolation. The core of the device consists of four independent transformers, each with its own isolation barrier that prevents electrical cross-talking and electrical noise from crossing to the system. The device also features a low power operation mode (Low-Power-On Mode) to maintain very low supply current. With this feature, the device operates with a supply current as low as 11 µA per channel.

The device is designed to separate AC and DC power via digital control. It includes individual microcontroller controlled input systems, which control the output signals according to programmed data. The isolator can be programmed according to logic levels and voltage levels, and used for 4-bit digital signals.

Features of SI8645BT-IS

The SI8645BT-IS offers a number of features that make it a great choice for industrial applications:

• Four 4-kV independent digital isolation channels
• Channel-to-channel and channel-to-ground isolation up to 10 kV
• Low power operation (Low-Power-On Mode) offering 11 µA supply current per channel
• Programmable logic level and voltage level for 4-bit digital signals
• 2500 vrms isolation rating
• High temperature operation reaching up to +125°C

The SI8645BT-IS is a feature-packed digital isolator that offers reliable isolation for industrial applications and sensitive systems. It ensures system voltage is maintained at a constant level, protecting downstream components from overvoltage, underestimated voltage, spikes and noise. With its high temperature capabilities, the device can be used in a wide variety of applications, including medical equipment, process control, power conditioning, renewable energy systems, electric vehicles, motor control, and industrial automation.

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