SI8421BD-B-ISR

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SI8421BD-B-ISR is a digital isolator, which provides a high-performance isolation solution for applications requiring low power operation, low latency, and a wide operating temperature range. This device is ideal for a wide range of data communication and signal transmission applications where isolation and low-power isolation are important parameters.

The SI8421BD-B-ISR digital isolator features an embedded SAR architecture with two independent isolation channels. This device operates at low power consumption and can achieve fast response times (down to 2 ns) at low latency. The wide operating temperature range provides a reliable isolation performance over the industrial temperature range from -40 °C to 85 °C.

To achieve positive energy transfer across the insulation barrier, the SI8421BD-B-ISR utilizes embedded transformer cores and a high-frequency differential ROSA circuit. This technology electrically removes any capacitive coupling or aero-magnetic coupling from the non-isolated section to the isolated section. The isolator then provides a fast and reliable transmission across the isolation barrier with very low conversion time.

The SI8421BD-B-ISR has two types of signaling: single-ended and differential. It provides single-ended signaling up to 4 Mbps while everything above 4 Mbps is routed as differential signaling. The quality of the transmission depends on the selected signaling, as single-ended signaling is more susceptible to EMI. The differential signaling can provide better performance with an increased datarate. The SI8421BD-B-ISR is also designed to support up to four differential pairs.

The digital isolator’s main operating principle is based on a transformer and voltage isolation. The signal applied to the input IC flows to an integrated transformer, which tracks the input signal. The signal is then connected to the output IC. The voltage isolation takes place up to 4 kV. This high voltage isolation ensures no AC power leakage between the non-isolated and the isolated section.

The SI8421BD-B-ISR digital isolator is a versatile device that provides stable data transmission with high isolation and low power consumption. It is suitable for applications such as industrial automation, automotive, communications, medical, and banking. It provides various signaling speeds from single-ended to differential and supports up to four differential pairs. Its low latency, high voltage isolation, and wide operating temperature range make it a reliable isolation solution for many applications.

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