The Microchip MCP9700AT-E/TT is a low-power analog-output local temperature sensor in a three-lead SOT-23-3 (TO-236-3/SC-59), from the MCP9700A "low-power linear active thermistor" family. It converts local die temperature into a linear analog voltage at 10 mV/°C, so an output of 0.5 V corresponds to 50 °C; there is no digital bus, no protocol, and no calibration step — the ADC at the other end of the trace reads temperature directly. That simplicity is the value proposition: for a thermal-shutdown supervisor, battery-thermal monitor, or thermostatic loop, the MCP9700 replaces a thermistor-plus-linearization network with a single precision part whose output needs no lookup table.
Accuracy is ±2 °C from 0 °C to 70 °C (the lowest/highest bounds are -2 °C and +4 °C across the wider range), and the sensor measures -40 °C to +125 °C with a 2.3 V to 5.5 V supply, so it runs from the same 3.3 V rail it protects and covers the full industrial temperature band. Supply current is low, which suits battery-powered monitoring, and the analog output also avoids the continuous power draw of a digital communication bus — the output can be sampled occasionally or gated through a series switch when only periodic readings are needed. The three-pin SOT-23-3 layout places the output pin in a standard arrangement that keeps the sensitive analog trace away from the supply side of the board. When selecting, budget your ADC reference accuracy against the ±2 °C figure, and note that the highest accuracy is guaranteed in the 0–70 °C test window, which covers most thermostat and protection applications. Active production, ROHS compliant, and in stock at ICBOMS.