TMP112AIDRLR: TI’s High‑Accuracy, Low‑Power Digital Temperature Sensor

1. Product Overview

The TMP112AIDRLR is a high‑accuracy, low‑power digital temperature sensor from Texas Instruments (TI), part of the TMP112 family. It comes in a 6‑pin SOT‑5X3 (DRL) package, measuring only 1.6 mm × 1.6 mm – about 68 % smaller than a traditional SOT‑23 package. The suffix "R" indicates tape‑and‑reel packaging with 4,000 units per reel.

The TMP112AIDRLR supports I²C and SMBus serial interfaces, is compatible with two‑wire bus systems, and is rated for operation from –40 °C to +125 °C. With its small size, high accuracy, and ultra‑low power consumption, this device is widely used in portable equipment, communication devices, computer thermal management, and industrial control applications where temperature monitoring is required.

2. Key Parameters

Parameter	Specification	Notes
Accuracy (0 °C to 65 °C)	±0.5 °C (maximum)	No calibration needed, at 3.3 V supply
Accuracy (–40 °C to 125 °C)	±1.0 °C (maximum)	Guaranteed over the full temperature range
Resolution	12‑bit (0.0625 °C)	High‑resolution temperature readings
Supply Voltage	1.4 V – 3.6 V	Wide voltage range
Operating Current	7.5 µA (maximum)	Extremely low power
Shutdown Current	0.35 µA (maximum)	Ultra‑low standby power
Interface	I²C / SMBus compatible	Two‑wire digital interface
Package	SOT‑5X3 (DRL)	6‑pin
Operating Temperature	–40 °C to +125 °C	Industrial temperature range
MSL Level	Level‑1‑260 °C‑UNLIM	Unlimited floor life
RoHS	Compliant Yes	Meets RoHS environmental requirements
Interface	I²C / SMBus compatible	Two‑wire digital interface

3. Key Features

High Accuracy Without Calibration – The TMP112A achieves an accuracy of ±0.5 °C (maximum) from 0 °C to 65 °C and ±1.0 °C (maximum) over the full –40 °C to +125 °C range – and no post‑manufacturing calibration is required to meet these specifications.

Ultra‑Low Power – Typical operating current is only 4.8 µA at a 4‑Hz conversion rate, with a maximum of 7.5 µA. In shutdown mode, the current drops to as low as 0.35 µA, making it ideal for battery‑powered portable devices.

Small Footprint – The SOT‑5X3 package (1.6 mm × 1.6 mm) is well suited for space‑constrained PCB designs.

NIST‑Traceable – Each device is factory‑calibrated, and the temperature data is traceable to the U.S. National Institute of Standards and Technology (NIST) standards.

4. Typical Applications
Portable / battery‑powered equipment – ultra‑low power extends battery life.

Communication equipment – thermal monitoring in base stations, routers, etc.

Computers and servers – CPU/GPU temperature monitoring and over‑temperature protection.

Industrial control – ambient temperature monitoring and process control.

Consumer electronics – smart home devices, wearables, and more.

5. Frequently Asked Questions
Q: What is the difference between the TMP112AIDRLR and other TMP112 family variants?

A: The TMP112A is optimised for accuracy at 3.3 V (±0.5 °C from 0 °C to 65 °C). The TMP112B is optimised for 1.8 V, the TMP112D for ≥1.5 V, and the TMP112N offers slightly lower accuracy (±1.0 °C over the full range). The TMP112AIDRLR is the standard A‑version device.

Q: How do I read the temperature data?

A: Read the 12‑bit temperature register via the I²C/SMBus interface – the resolution is 0.0625 °C per LSB. The device also provides an ALERT pin that can be configured as an over‑temperature alarm output.

Q: What is the minimum supply voltage?

A: The minimum is 1.4 V and the maximum is 3.6 V, making it compatible with common low‑voltage rails such as 1.8 V and 3.3 V.

Q: Does the tiny package affect measurement accuracy due to self‑heating?

A: The device's own power consumption is extremely low (operating current <7.5 µA), so self‑heating is negligible. The package leads are the primary thermal path, so it is recommended to place the device away from high‑power heat‑generating components on the PCB.

6. Conclusion
The TMP112AIDRLR combines high accuracy (±0.5 °C), ultra‑low power (7.5 µA), and an extremely compact footprint (1.6 mm × 1.6 mm) – all without requiring calibration. When designing with this device, focus on I²C timing, ALERT configuration, and PCB layout/thermal management – these three aspects will help you build a reliable, high‑accuracy temperature monitoring system with ease.

Fudong Communication (Shenzhen) Group Co., Ltd., established in 2004, is a specialized global first tier semiconductor agent/distributor.

Fudong Mall is an online e-commerce platform belonging to Fudong Communication (Shenzhen) Group Co., Ltd. Fudong collaborates with global electronic component distributors and Chinese spot inventory suppliers.