MCP98243T-BE/MCAA

Overview

The MCP98243T-BE/MCAA is a digital temperature sensor with an integrated 2 Kbit Serial EEPROM for SPD. It operates within a -40°C to +125°C range and meets JEDEC JC42.4-TSE2002B3 specifications. Accuracy is ±0.2°C/±1°C (typ./max.) from +75°C to +95°C, and ±1°C/±3°C (typ./max.) from -20°C to +125°C. The specified VDD range is 3.0V to 3.6V, while the operating range extends from 2.7V to 5.5V. Typical operating current is 200 µA. It features a 2-wire I²C/SMBus interface.

Feature Summary

• Integrates a 2 Kbit Serial EEPROM organized as 256 x 8-bit for storing memory module and vendor information.
• Features user-programmable registers allowing selectable Shutdown or Low-Power modes and configurable temperature Event boundaries.
• Provides an open-drain Event output pin that signals when ambient temperature exceeds specified limits.
• Supports permanent and reversible software write protection for the lower 1 Kbit of EEPROM storage.

Applications

• DIMM Modules for Servers
• DIMM Modules for PCs
• DIMM Modules for Laptops

Procurement Notes

Verify the specific suffix MCAA against official Microchip documentation to confirm package type and tape-and-reel configuration. Ensure the ordering code matches the required JEDEC compliance level and accuracy grade. Cross-reference the datasheet revision date to confirm electrical characteristics remain unchanged.

Selection Notes

Select this component when JEDEC JC42.4-TSE2002B3 compliance is mandatory for memory modules. Choose this part over the MCP9843 if onboard data storage via the integrated 2 Kbit EEPROM is required. Verify that the system voltage falls within the 2.7V to 5.5V operating range for full functionality.

Part Context

This device belongs to the MCP9843/98243 family of digital temperature sensors manufactured by Microchip Technology. It shares the same thermal sensing core and interface protocol as the MCP9843 but adds dedicated EEPROM capabilities specifically designed for Serial Presence Detect applications in DRAM DIMMs.

Replacement Considerations

The MCP98242 is a comparable part within the same family. Differences include the MCP98242 lacking the internal EEPROM and having different I2C timeout ranges and maximum bus frequencies. Verify compatibility regarding address pins and register maps before substitution.