Microchip lists the MCP9701AT-E/LT as Active, so there is no imminent end-of-life notice or last-time-buy window to manage.
19.5 mV/°C output — what the scale means for your ADC input
The MCP9701AT-E/LT outputs an analog voltage that changes 19.5 mV per degree Celsius. At 0°C the output sits at 500 mV typical; at 125°C it reaches roughly 2.94 V. This 2.44 V span fits comfortably within a 3.3V ADC reference without gain staging, though a 5V reference gives more headroom at the hot end.
Accuracy band and the error budget for your system
The highest accuracy is ±2°C; the lowest (worst-case over temperature) is -2°C, +4°C. For a system that needs better than ±4°C absolute accuracy, a one-point calibration at a known temperature (e.g., 25°C) can tighten the error to roughly ±1°C across the -10°C to +125°C range.