ADT7421ARMZ-2RL

Overview

The ADT7421ARMZ-2RL is a dual-channel digital thermometer and under/overtemperature alarm manufactured by onsemi. It features Beta Cancellation Technology for accurate measurement of small geometry CPU processes, with local accuracy of ±2.75°C and remote accuracy ranging from ±1.75°C to ±3.25°C depending on conditions. The device operates on a 3.0 V to 3.6 V supply, supports a 2-Wire SMBus interface, and provides up to two overtemperature fail-safe THERM outputs. It is housed in an 8-lead MSOP package.

Feature Summary

• Beta Cancellation Technology automatically compensates for beta variations in embedded thermal transistors of small geometry CPUs.
• Series Resistance Cancellation automatically removes the effect of parasitic resistance on the remote sensor inputs.
• Switchable temperature measurement range allows selection between default (0°C to +125°C) and extended (-40°C to +125°C) modes.
• Pin- and register-compatible with ADM1032, ADT7461, and ADT7461A devices.

Applications

• Desktop and Notebook Computers
• Industrial Controllers
• Smart Batteries
• Automotive Systems
• Embedded Systems

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for lead-free packaging markings. Ensure the specific -2 suffix variant matches system requirements regarding SMBus address configuration before finalizing procurement orders.

Selection Notes

Select this model when precise monitoring of small geometry processors is required due to its integrated beta cancellation capabilities. Verify that the SMBus address 0x4D aligns with existing bus configurations. Consider the extended temperature range option if operation below 0°C is necessary for the target application environment.

Part Context

This component belongs to the ADT7421 series of precision temperature sensors. It is designed as a drop-in replacement for legacy parts like the ADM1032 while offering enhanced accuracy for modern semiconductor geometries. The -2RL suffix indicates the specific SMBus address variant and reel packaging format.

Replacement Considerations

Compatible replacements include ADT7421ARMZ, ADT7461ARMZ, and ADM1032 variants. Verify pinout compatibility and ensure the substitute part supports the required SMBus address configuration for the specific system design.

FAQ

What is the function of the Beta Cancellation feature?

It automatically cancels errors induced by beta variations in thermal transistors used in small geometry (less than 45 nm) CPU processes.

How does the Series Resistance Cancellation work?

It automatically cancels up to 50 Ohms of typical series resistance found on the D+ and D- inputs, eliminating the need for user characterization.

What is the difference between the ADT7421 and ADT7421-2?

The ADT7421-2 has a different default SMBus address (0x4D) compared to the standard ADT7421 (0x4C), allowing multiple devices on the same bus.