ISO7821LLSDW

Overview

The ISO7821LLSDW is a dual-channel digital isolator from Texas Instruments, utilizing capacitive coupling technology to provide electrical isolation between circuits. It operates within a supply voltage range of 3 V to 5.5 V and supports data rates up to 150 Mb/s. The device features an insulation voltage rating of 5700 Vrms and offers bidirectional or unidirectional signal transmission. Key performance metrics include a propagation delay of 17 ns, rise and fall times of 1.38 ns, and a common-mode transient immunity of 100 kV/µs. It functions reliably across an extended temperature range from -55°C to +125°C and is housed in a 16-pin SOIC package.

Feature Summary

• Capacitive coupling architecture for high-speed digital signal isolation
• Extended industrial operating temperature range for harsh environments
• High common-mode transient immunity ensuring signal integrity
• Dual-channel configuration with flexible polarity support

Applications

• Industrial automation systems requiring galvanic isolation
• Medical equipment needing reliable signal separation
• Power metering applications with high-voltage interfaces
• Inverter drives and motor control circuits

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm pinout and functional compatibility. Ensure the component meets RoHS standards if required by your assembly process. Check humidity sensitivity levels prior to soldering to prevent moisture-induced damage during reflow. Confirm that the 16-SOIC package dimensions align with your PCB footprint requirements.

Selection Notes

Select this component when high-speed data transmission is required alongside robust electrical isolation. The 150 Mb/s data rate suits applications demanding rapid signal processing. Consider the 5700 Vrms insulation rating for safety-critical designs. The wide temperature range makes it suitable for outdoor or industrial settings where thermal stability is essential.

Part Context

This part belongs to the ISO7821LLS series of digital isolators. It is designed to replace optocouplers in many applications, offering superior performance in speed, power consumption, and size. The series is widely used in interface ICs for various electronic systems requiring reliable signal transfer across isolation barriers.

Replacement Considerations

Consult official substitution guides for compatible alternatives. Verify pin-to-pin compatibility and electrical specifications before replacing.