What the 10 mV/°C output means for your ADC input
The LM45CIM3X/NOPB outputs an analog voltage that scales 10 mV per degree Celsius — at 25°C the output sits at 250 mV, at 100°C it is 1.0 V. A 10-bit ADC with a 2.5 V reference resolves about 0.24°C per LSB, so no external gain stage is needed for most microcontroller inputs. The 4 V to 10 V supply range means the sensor runs cleanly off a 5 V rail or a 9 V battery, but the 4 V minimum excludes direct 3.3 V operation — a boost regulator or a different low-voltage sensor is required for 3.3 V-only designs.
Temperature range and accuracy — where it fits and where it doesn't
The local sensing range is -20°C to 100°C, which matches the calibrated band. If the application requires measuring the die temperature of a nearby hot component above 100°C, the sensor itself survives 125°C ambient but the output accuracy is not guaranteed beyond 100°C.
Package and board-fit — SOT-23-3 reuse
The SOT-23-3 (TO-236-3, SC-59) footprint is shared with the LM35, MCP9700, and many small-signal transistors — a board already laid out for those parts accepts the LM45CIM3X/NOPB without a respin. The tape-and-reel or cut-tape packaging means it feeds into standard pick-and-place lines. Surface-mount only — no through-hole variant exists for this order code. The three-pin layout (V+, GND, Vout) is straightforward; no exposed pad or thermal slug to manage.
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