ADUM7440CRQZ-RL7

Overview

The ADuM7440CRQZ-RL7 is a quad-channel digital isolator utilizing iCoupler technology, featuring magnetic coupling for signal transmission. It provides a 1000 Vrms isolation rating and supports bidirectional communication with data rates up to 25 Mbps (NRZ). The device operates on supply voltages between 3 V and 5.5 V, with maximum power consumption of 11.5 mA per channel at 5 V and 25 Mbps. Key electrical parameters include a propagation delay of 50 ns, rise/fall times of 2.8 ns typical, and common-mode transient immunity exceeding 15 kV/µs. It functions within an operating temperature range of -40°C to +105°C and is housed in a 16-lead QSOP package.

Feature Summary

• Integrates four independent channels using monolithic air core transformer technology for high-speed digital isolation.
• Provides robust common-mode transient immunity exceeding 15 kV/µs to maintain signal integrity in noisy environments.
• Supports bidirectional communication with automatic polarity detection and level translation between 3 V and 5 V logic families.
• Delivers low power consumption across varying data rates while maintaining small form factor packaging.

Applications

• SPI interface and data converter isolation
• RS-232, RS-422, and RS-485 transceiver isolation
• Industrial field bus isolation

Procurement Notes

Verify the specific suffix RL7 indicates reel packaging when sourcing. Confirm the CRQZ variant meets required regulatory approvals such as UL 1577 and CSA Component Acceptance Notice #5A. Ensure the 16-lead QSOP footprint matches the target PCB layout constraints. Check current availability status as distribution may vary by region.

Selection Notes

Select this component for applications requiring four isolated channels with high common-mode noise rejection. It is suitable where size constraints prohibit traditional optocouplers. Verify that the 25 Mbps data rate aligns with system timing requirements. Consider the 1000 Vrms isolation barrier for safety compliance in industrial or medical contexts.

Part Context

This part belongs to the ADuM744x family of quad-channel digital isolators from Analog Devices. It represents an evolution of iCoupler technology, replacing bulky optical components with integrated magnetic transformers. The series offers standardized pinouts for easy replacement in existing designs requiring multi-channel galvanic isolation.

Replacement Considerations

Direct substitutes include other ADuM744x variants with different directionality configurations. Verify pin compatibility and isolation voltage ratings before substitution. Ensure the alternative device supports the required 25 Mbps data rate and operating temperature range.