STISO621TR

Overview

The STISO621TR is a dual-channel digital isolator from STMicroelectronics, utilizing thick oxide galvanic isolation technology. It features two independent channels with 1-to-1 directionality and Schmitt trigger inputs for high noise immunity. The device supports data rates up to 100 Mbps with a maximum propagation delay of 42 ns and pulse width distortion under 3 ns. It operates on a supply voltage of 3V to 5.5V and withstands an isolation voltage of 4000 Vpk. Common-mode transient immunity is rated at 50 kV/µs. The component functions within a temperature range of -40°C to 125°C and is housed in an 8-SOIC package.

Feature Summary

• Dual-channel architecture with independent signal paths
• High common-mode transient immunity for robust operation
• Low pulse width distortion ensuring signal integrity
• Wide operating temperature range for industrial environments

Applications

• Industrial automation control systems
• Power metering and energy monitoring equipment
• Inverter drives and motor control interfaces
• Medical equipment requiring galvanic isolation

Procurement Notes

Verify the specific ordering suffix to confirm packaging type, such as tape-and-reel or cut tape, as these affect handling but not electrical function. Ensure compatibility with the target PCB footprint, specifically the 8-SOIC package dimensions. Confirm that the required isolation voltage rating meets the safety standards of the end application. Check for RoHS compliance status if environmental regulations apply to the manufacturing process.

Selection Notes

Select this component when high-speed digital communication requires reliable galvanic isolation between circuits. The 100 Mbps data rate suits applications needing faster response than optical isolators. Consider the 8-SOIC package for space-constrained designs. Evaluate the 50 kV/µs CMTI rating against the noise environment of the power stage. Ensure the 3V to 5.5V supply range matches the logic levels of both sides of the isolation barrier.

Part Context

The STISO621TR belongs to the STISO series of digital isolators based on ST's proprietary thick oxide technology. This family offers alternatives to traditional optocouplers by providing higher reliability and lower power consumption. The series includes single and dual-channel variants designed for various isolation requirements in industrial and consumer electronics.

Replacement Considerations

Direct substitutes include other dual-channel digital isolators with similar 100 Mbps speeds and SO-8 packages. Verify pinout compatibility before swapping. Compare isolation voltage ratings and CMTI specifications to ensure equivalent performance in the specific circuit environment.