Analog local temperature sensor with a linear 10 mV/°C scale
The Texas Instruments LM61BIM3X/NOPB is an analog local temperature sensor that outputs a voltage linearly proportional to temperature at 10 mV/°C. It senses from -30°C to +100°C, which covers the industrial control and appliance monitoring band, and operates on a supply from 2.7 V to 10 V.
Accuracy grade and what it means for measurement margin
Accuracy is specified as ±2°C (typical) and ±3°C (maximum) at 25°C, tested under the conditions listed in the datasheet. In a system that alarms at 85°C, the ±3°C worst-case means the actual silicon temperature could be 82°C or 88°C when the output reads 85°C — a margin the downstream comparator or ADC must accommodate. The 10 mV/°C scale factor gives 0.25 V at -25°C and 1.0 V at 100°C, so a 10-bit ADC with a 2.5 V reference resolves roughly 0.24°C per LSB — adequate for most monitoring loops without external amplification.
Shutdown mode for power-sensitive designs
The shutdown mode feature lets the sensor be put into a low-power state between readings. In a battery-powered data logger that samples temperature once per minute, the sensor spends most of its time off, drawing only leakage current from the supply rail.
SOT-23-3 footprint and board integration
Housed in the industry-standard SOT-23-3 package (TO-236, SC-59 compatible), the LM61BIM3X/NOPB mounts on the same footprint as countless other three-pin analog sensors and transistors. The surface-mount package suits automated pick-and-place assembly and reflow soldering.