The MCP9843-BE/ST: This accuracy specification is the worst-case limit over the entire temperature and supply voltage envelope, so a system designer can budget 3°C of measurement uncertainty into the thermal shutdown or fan-control threshold without additional characterization. The sensor communicates over an I²C/SMBus interface, outputting the converted temperature value through a register bank that the host controller reads. An integrated sigma-delta ADC performs the conversion; the register bank stores the result and the user-programmable alarm limits.
2.7V to 5.5V supply — single-rail operation from 3.3V or 5V buses
The I²C/SMBus interface is referenced to the same supply voltage, so the bus pull-up resistors must be tied to the same rail to guarantee the logic-high threshold. The surface-mount package reflows with standard lead-free profiles and is compatible with automated optical inspection.
Active production — ROHS3 compliant, no end-of-life notice
The device is ROHS3 compliant, meeting the EU Directive 2011/65/EU and its amendments, which covers the majority of global regulatory requirements for lead-free assembly. For procurement planning, the active status means the part is available through Microchip's authorized distribution channel and independent supply.