Temperature-to-voltage scale and system error budget
The MCP9701T-E/TT outputs 19.5 mV per °C — a 1°C temperature change shifts the output by roughly 20 mV, which a 10-bit ADC on a 3.3 V reference resolves to about 0.16°C per LSB. That scale factor is fixed and ratiometric to the supply, so the ADC's own reference drift becomes the dominant error term, not the sensor's slope. For a system that must hold ±2°C at the measurement point, this sensor needs a one-point calibration at the operating temperature to tighten the window — the offset error is stable enough to trim out in firmware.
Supply rails and operating envelope
The output voltage at 0°C is 500 mV typical, so the sensor stays above ground even at the lowest supply — no negative rail needed. Operating temperature spans -40°C to 125°C, which puts it in the industrial and automotive under-hood band. The sensing range is -10°C to 125°C local; below -10°C the output still tracks temperature but the accuracy spec is not guaranteed.
Package and board-fit for space-constrained designs
Housed in a three-lead SOT-23-3 (TO-236-3 / SC-59), the part takes up roughly 3 mm × 1.5 mm of board area. The small footprint makes it a natural fit for multi-sensor arrays or battery-powered modules where every square millimetre counts.