Texas Instruments TMP75AIDG4

Overview

TMP75AIDG4 from Texas Instruments is a digital temperature sensor with I²C/SMBus interface, designed for thermal monitoring and protection in embedded systems. It delivers ±1 °C typical accuracy from −40 °C to +125 °C, 9–12-bit user-selectable resolution (down to 0.0625 °C), and operates from 2.7 V to 5.5 V. Its 8-pin VSSOP package supports up to eight devices per bus and features NIST-traceable calibration.

For engineers reviewing the TMP75AIDG4 datasheet, TMP75AIDG4 pinout, TMP75AIDG4 application, or TMP75AIDG4 equivalent, key selection criteria include SMBus Alert support, low 50-μA quiescent current, address pin configuration (A0–A2), and compatibility with LM75-form-factor layouts in power-supply monitoring and battery management circuits.

Technical Context

The TMP75AIDG4 integrates a ΔΣ ADC, on-chip oscillator, and digital control logic to convert die temperature directly into calibrated digital output without external signal conditioning. Its internal diode-based sensor provides linear response across −40 °C to +125 °C, eliminating lookup tables or polynomial compensation.

It implements full SMBus 2.0 and I²C protocol compliance-including START/STOP, ACK/NACK, general call, and high-speed mode (up to 2 MHz)-with integrated Schmitt triggers and spike suppression on SDA/SCL. The ALERT pin functions as an open-drain interrupt output tied to programmable THIGH/TLOW thresholds in thermostat mode.

Key Specifications

Pinout & Package

The TMP75AIDG4 is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm, compatible with industry-standard LM75 footprints and reflow soldering processes.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensor applications.

Compared with LM75BIMX/NOPB, TMP75AIDG4 adds NIST-traceable calibration and user-selectable resolution; versus TMP102AIDRLR, it supports wider voltage, extended temperature range, and higher bus node count-making it optimal for industrial and computing thermal subsystems requiring metrological integrity and design scalability.

Availability

TMP75AIDG4 is available at Aetrix Electronics and suitable for power-supply temperature monitoring, notebook computer thermal management, and battery management systems requiring stable component supply, long-term lifecycle support, and consistent NIST-traceable performance.

Supply support for TMP75AIDG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The TMP75AIDG4 belongs to TI's precision analog temperature sensor product line, engineered specifically for replacing thermistors in thermal protection and closed-loop thermal management systems where accuracy, bus scalability, and metrological traceability are critical.

FAQ

What is the maximum operating temperature range specified for the TMP75AIDG4?

The TMP75AIDG4 is specified to operate from −40 °C to +125 °C ambient temperature. This range is validated across all electrical characteristics including accuracy, conversion time, and supply current. The device's junction temperature limit is 150 °C, and its storage temperature range extends from −60 °C to +130 °C. These specifications make TMP75AIDG4 suitable for under-hood automotive modules, industrial motor drives, and high-density computing equipment where sustained elevated temperatures occur.

Does the TMP75AIDG4 require external components for basic I²C operation?

Yes - the TMP75AIDG4 requires external 4.7-kΩ pull-up resistors on both SDA and SCL lines, and a 0.01-μF ceramic bypass capacitor between V+ and GND placed as close as possible to the device. These components ensure reliable I²C signaling, noise immunity, and stable internal oscillator/ADC operation. No external sensor, op-amps, or calibration circuitry is needed, as the die temperature measurement is fully integrated and factory-calibrated.

How many TMP75AIDG4 devices can share the same I²C bus?

Up to eight TMP75AIDG4 devices can operate on a single I²C bus. This is enabled by three hardware address pins (A0, A1, A2), each configurable as logic high, low, or floating to generate unique 7-bit slave addresses (1001000 to 1001111). Unlike the TMP175 variant (which supports 27 addresses), the TMP75AIDG4 implements a fixed 3-bit address space optimized for compact thermal monitoring arrays in space-constrained systems.

Is the TMP75AIDG4 pin-compatible with the LM75 family?

Yes - the TMP75AIDG4 uses the identical 8-pin SOIC and VSSOP footprints and pinout as the industry-standard LM75. Pin 1 (SDA), pin 2 (SCL), pin 3 (OS/ALERT), pin 4 (GND), pin 5 (A2), pin 6 (A1), pin 7 (A0), and pin 8 (V+) match LM75 assignments exactly. This allows direct mechanical and electrical replacement in existing LM75 designs without layout changes, while delivering improved accuracy, resolution, and NIST traceability.

What does "NIST traceable" mean for the TMP75AIDG4 calibration?

"NIST traceable" means every TMP75AIDG4 production unit is tested against temperature reference standards calibrated to the U.S. National Institute of Standards and Technology (NIST) through ISO/IEC 17025-accredited laboratories. This establishes an unbroken chain of measurement uncertainty back to national standards, ensuring ±1 °C typical accuracy is verifiable and repeatable across manufacturing lots-critical for medical, aerospace, and industrial safety-critical thermal monitoring applications.