Reports board or ambient temperature over I2C to +/-0.5 C without calibration, in a tiny SOT-563. Twelve-bit resolution gives 0.0625 C steps across -40 to 125 C, an ALERT output fires on programmable high/low limits for thermostat use, and an address pin (ADD0) allows up to four devices on one bus. It runs from 1.4 to 3.6 V at a few microamps, so it fits battery designs. A small, accurate alternative to a thermistor plus ADC.

Pinout

Pin	Name	Type	Function
1	SCL	input	I2C/SMBus serial clock input. Open-drain bus line; requires an external pullup to V+. Voltage rating -0.5 V to 4 V.
2	GND	power_in	Device ground / negative supply reference. Note: pin 1 has curved edges in TMP112Dx packages (not applicable to SOT563).
3	ALERT	output	Overtemperature alert, open-drain output; requires an external pullup resistor. If unused, tie to GND (preferred).
4	ADD0	input	I2C address-select input. Tie to V+, GND, SDA, or SCL to select one of four 7-bit slave addresses, allowing up to four TMP112 devices on one bus.
5	V+	power_in	Positive supply input, 1.4 V to 3.6 V (3.3 V nominal). Absolute maximum 4 V. Typical quiescent current 3.2 uA.
6	SDA	bidirectional	I2C/SMBus serial data line. Open-drain output; requires an external pullup to V+. Voltage rating -0.5 V to 4 V.

Key specifications

Parameter	Value
Type	Digital temperature sensor
Interface	I2C / SMBus (4 addresses)
Accuracy	+/-0.5 C (max, -25 to 85 C)
Resolution	12-bit (0.0625 C)
Range	-40 to 125 C
Alert	Programmable high/low limit output
Supply	1.4-3.6 V
Package	SOT-563

Ordering variants

Same part, different packaging or reel option.

TMP112AIDRLR (SOT-563, +/-0.5 C)
TMP112BIDRLR (wider range)
TMP112NAIDRLR (relaxed accuracy)

CAD (KiCad official)

Symbol: Sensor_Temperature:TMP112xxDRL (KiCad official)
Footprint: Package_TO_SOT_SMD:SOT-563
3D model: SOT-563 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Texas Instruments datasheet (46 pp, sha256 5e9dc199169e25b3, retrieved 2026-08-17, tier: manufacturer)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF