ISO7821LLDWR

Overview

The ISO7821LLDWR is a dual-channel digital isolator from Texas Instruments, utilizing capacitive coupling technology. It operates within a supply voltage range of 2.25 V to 5.5 V and features a maximum data rate of 100 Mb/s. The device provides an insulation voltage of 5700 Vrms and supports a common-mode transient immunity of 100 kV/µs. It exhibits a typical propagation delay of 11 ns and consumes 7.5 mA of operating current. Packaged in a 16-pin SOIC (SOIC-16) surface-mount format, it functions unidirectionally with one forward and one reverse channel. The component is rated for operation between -55°C and +125°C.

Feature Summary

• Provides reinforced isolation via capacitive coupling for high noise immunity
• Supports LVDS buffer applications with low propagation delay
• Operates without an isolated power supply requirement

Applications

• LVDS signal buffering across isolation barriers
• Industrial communication interfaces requiring high CMTI
• Medical equipment signal transmission

Procurement Notes

Verify the specific suffix 'W' indicates tape-and-reel packaging when ordering. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure ESD handling protocols are followed due to moisture sensitivity classification. Cross-reference the full part number against the latest datasheet revision to confirm pinout and electrical characteristics match design requirements.

Selection Notes

Select this component for designs requiring bidirectional-like functionality using two unidirectional channels. It is suitable where high common-mode transient immunity is critical. Consider the 16-pin SOIC footprint for PCB layout constraints. Evaluate power consumption against system thermal limits given the 7.5 mA quiescent current.

Part Context

This device belongs to the ISO7821LL family of digital isolators. It serves as a specialized buffer for LVDS signals, distinguishing itself from general-purpose isolators by its optimized performance for differential signaling. The family shares similar isolation ratings but varies in channel configuration and specific interface support.

Replacement Considerations

ISO7821LLDW is the non-reel variant of the same component. ISO7821FDWR offers higher isolation ratings within the same package.