ADT7421ARMZ-REEL

Overview

The ADT7421ARMZ-REEL is a dual-channel digital thermometer and under/overtemperature alarm manufactured by onsemi. It features Beta Cancellation Technology for accurate temperature measurement of small geometry (less than 45 nm) processes, automatically canceling beta variations and up to 50 ohms of series resistance. The device provides local and remote temperature sensing with resolutions of 1°C and 0.25°C respectively. It operates within a supply voltage range of 3.0 V to 3.6 V and supports an SMBus interface at frequencies up to 400 kHz. The default measurement range is 0°C to +125°C, switchable to an extended range of -40°C to +125°C.

Feature Summary

• Beta Cancellation Technology compensates for thermal transistor variations in small geometry CPUs.
• Series Resistance Cancellation removes parasitic resistance effects from remote sensor readings.
• Configurable ALERT and THERM outputs support interrupt signaling and fan control.
• Pin and register compatibility with ADM1032, ADT7461, and ADT7461A.

Applications

• Desktop and notebook computers
• Industrial controllers
• Smart batteries
• Automotive systems
• Embedded systems

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and reel specifications. Confirm RoHS compliance status as required by project standards. Check current availability through authorized distributors, noting that lead times may vary based on production schedules. Ensure the component matches the exact part number for pin and register compatibility with existing designs.

Selection Notes

Select this component when monitoring temperatures on small geometry processors requiring beta compensation. Ensure the system operates within the 3.0 V to 3.6 V supply voltage range. Verify that the SMBus address configuration meets system requirements if multiple sensors are used. Consider the MSOP-8 package constraints for PCB layout and thermal management needs.

Part Context

This device belongs to the ADT7421 family of precision temperature sensors. It is designed as a drop-in replacement for legacy components like the ADM1032. The REEL suffix indicates it is supplied in tape and reel packaging for automated assembly. It shares functional similarities with other onsemi thermal management ICs but offers specific beta cancellation capabilities.

Replacement Considerations

The ADT7421 is pin and register compatible with the ADM1032, ADT7461, and ADT7461A. Designers can substitute these parts directly without schematic changes. Verify that the replacement part supports the required SMBus address and conversion rates for the target application.