ISO7721FDWR

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Digital isolators are intelligent, passive components used to electrically isolate signals between two chip or system levels, thus preventing undesirable interference. Sensitive information can be transmitted over large distances due to the complete isolation of the digital signal emerging from the source. The ISO7721FDWR is a digital isolator with Wafer-Level Chip-Scale Packaging (WLCSP) technology developed by Texas Instruments. This device complies with the ISO/IEC 61131-2 (TÜV) and ISO/IEC 61131-3 (UL) standards, and is designed to increase the noise immunity, circuit integrity and robustness of industrial systems.

The ISO7721FDWR is a single-channel digital isolator, operating from a supply voltage of 3.3V, that provides a primary side signal level of either 0.8V (low) or 2.3V (high) and a secondary signal level of either 0.8V (low) or 3.3V (high). It also includes a secondary current source capable of delivering 100mA, enabling the device to directly power low voltage logic. The device includes a high-speed gate: its propagation delay is only 7ns and its rise/fall times are just 1ns.

The operating temperature range of the ISO7721FDWR extends from -40C to +105C with a current consumption of only 4.2 mA. It can be powered with a single 3.3V supply, eliminating the need for a negative supply voltage. In addition, the device features a high common mode transient immunity rating (CMTI) of 25kV/μsec and very low offset voltage (Vos). Therefore, the device withstands any common mode voltage, eliminating the need for an expensive isolation solution.

The ISO7721FDWR is designed for use in industrial applications such as motor control, programmable logic controllers (PLCs), human-machine interfaces (HMIs), process control systems, and distributed control systems (DCS). Its wide input/output range makes it ideal for both digital and analog applications, while its very fast propagation and rise/fall time ensures reliable information transfer even in high-speed and noisy environments. The device also features protection to both the secure side and open side, ensuring safe and reliable operation.

In conclusion, the ISO7721FDWR digital isolator is an ideal solution for various digital and analog signals, including motor control, programmable logic controllers (PLCs) and human-machine interfaces (HMIs). Its fast propagation and rise/fall times, high common mode transient immunity rating (CMTI), low offset voltage (Vos) and low current consumption make it an excellent choice for isolating signals in industrial applications. Furthermore, it is designed with protection to both the primary and secondary sides, ensuring reliable operation in very noisy environments.

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