MCP9843T-BE/ST

Thermal Management Overview

The MCP9843T-BE/ST is a digital temperature sensor by Microchip Technology. It converts ambient temperature from -40°C to +125°C into a digital word via a Delta-Sigma ADC. The device features Grade B accuracy of ±0.2°C typical and ±1°C maximum between +75°C and +95°C, with ±3°C maximum over the full range. It operates on a 2-wire I²C/SMBus interface with an operating voltage range of 2.7V to 5.5V. The component is housed in an 8-lead DFN package.

Thermal Management Feature Summary

• Provides high-precision temperature measurement using a Delta-Sigma Analog-to-Digital Converter.
• Supports user-programmable registers for configurable shutdown modes and temperature event boundaries.
• Features an open-drain Event output pin that signals when temperature exceeds specified limits.
• Compatible with standard 2-wire I²C and SMBus protocols for serial communication.

Thermal Management Applications

• DIMM modules for servers, PCs, and laptops
• General purpose temperature datalogging

Thermal Management Procurement Notes

Verify the specific suffix 'BE' corresponds to the required accuracy grade (±1°C max) and the '/ST' indicates the TSSOP-8 package variant if applicable, as datasheet documentation primarily references DFN packages for this part number. Confirm JEDEC JC42.4-TSE3000B3 compliance requirements against your system specifications before finalizing procurement orders.

Thermal Management Selection Notes

Select this component for applications requiring precise thermal monitoring within memory modules or general electronics. Ensure the host controller supports the 2-wire I²C protocol and can handle the open-drain Event output configuration. Consider the thermal resistance characteristics of the chosen package type for effective heat dissipation during operation.

Thermal Management Part Context

This device belongs to the MCP9843/98243 family of digital temperature sensors designed for memory module thermal sensing. While the MCP98243 includes integrated EEPROM for Serial Presence Detect (SPD), the MCP9843 focuses solely on temperature conversion without onboard storage capabilities.

Thermal Management Replacement Considerations

The MCP98243 serves as a functional substitute offering identical temperature sensing capabilities but adds 2 Kbit EEPROM for SPD data storage. Verify package compatibility and address pin configurations when substituting between these variants.

Thermal Management FAQ

Does the MCP9843 include internal EEPROM?

No, the MCP9843 does not contain internal EEPROM. Only the MCP98243 variant includes the 2 Kbit Serial EEPROM for SPD functionality.

What is the maximum accuracy specification?

The maximum accuracy is ±1°C between +75°C and +95°C, and ±3°C across the extended range of -20°C to +125°C.