ADT7421ARZ-REEL7

Overview

The ADT7421ARZ-REEL7 is a dual-channel digital thermometer and under/overtemperature alarm manufactured by onsemi. It features Beta Cancellation Technology for accurate measurement of small geometry (less than 45 nm) processes, automatically cancelling up to 50 ohms of series resistance. The device provides local temperature accuracy of ±2.75°C with 1°C resolution, and remote sensor accuracy ranging from ±1.75°C to ±3.25°C with 0.25°C resolution. It operates on a 3.0 V to 3.6 V supply, supports an SMBus interface at 400 kHz, and offers switchable measurement ranges of 0°C to +125°C or −40°C to +125°C.

Feature Summary

• Beta cancellation technology compensates for thermal transistor variations in small geometry CPUs.
• Automatic series resistance cancellation removes parasitic trace resistance errors.
• Configurable ALERT and THERM outputs support interrupt signaling and fan control.
• Pin and register compatible 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 and lead-free designation prior to integration. Ensure the SMBus address matches system requirements, as alternative addresses may require different part variants.

Selection Notes

Select this component when monitoring embedded thermal transistors in advanced process nodes requiring beta compensation. Verify that the required temperature range aligns with the default or extended modes. Ensure the system power supply remains within the 3.0 V to 3.6 V operating window for optimal performance.

Part Context

This device belongs to the ADT7421 family of precision temperature sensors. It shares pinout and register compatibility with the ADM1032, ADT7461, and ADT7461A, facilitating direct replacements in existing designs. The REEL7 suffix indicates tape and reel packaging suitable for automated surface-mount assembly.

Replacement Considerations

The ADT7421 is functionally interchangeable with the ADM1032, ADT7461, and ADT7461A due to identical pinouts and register maps. Verify that the replacement variant supports the required SMBus address configuration if multiple devices share the bus.