Texas Instruments TMP275AID

Overview

TMP275AID from Texas Instruments is a ±0.5°C accurate digital temperature sensor IC with 12-bit ΔΣ ADC, I²C/SMBus interface, and programmable resolution (9–12 bits), operating from 2.7 V to 5.5 V over −40°C to +125°C - used for thermal protection in power supplies, servers, and battery management systems.

For engineers reviewing the TMP275AID datasheet, TMP275AID pinout, TMP275AID application, or TMP275AID equivalent, key selection criteria include its LM75-compatible pinout, 0.0625°C resolution at 12-bit mode, 50 µA quiescent current, ALERT interrupt/comparator functionality, and support for up to eight devices on one bus via A0–A2 address pins.

Technical Context

The TMP275AID integrates a precision bandgap temperature sensor, sigma-delta ADC, oscillator, control logic, and I²C/SMBus slave interface - all factory-calibrated for ±0.5°C accuracy from −20°C to 100°C. Its register map includes Temperature, Configuration, THIGH, TLOW, and Pointer registers, enabling flexible thermostat and one-shot operation.

It supports Fast Mode (400 kHz) and High-Speed Mode (2.38 MHz) I²C timing, features open-drain SDA/SCL/ALERT with integrated Schmitt triggers and spike suppression, and implements bus time-out (54 ms typical) and SMBus Alert response protocol - ensuring robust multi-drop communication without external components.

Key Specifications

Pinout & Package

Package: SOIC-8 (4.90 mm × 3.91 mm) - industry-standard LM75 form factor, surface-mount compatible, no external components required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMP75AID, TMP275AID extends usable temperature range and improves long-term stability; versus LMT70YFQR, it trades absolute precision for integrated digital interface, lower design complexity, and guaranteed ±0.5°C system accuracy without external components.

Availability

TMP275AID is available at Aetrix Electronics and suitable for power-supply thermal monitoring, server rack temperature control, and battery pack safety management requiring stable component supply and long-lifecycle support.

Supply support for TMP275AID 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 company specializing in analog and embedded processing technologies, with leadership in precision sensing, power management, and interface solutions.

The TMP275AID belongs to TI's high-accuracy digital temperature sensor product line, designed specifically for reliable thermal monitoring in industrial, computing, and communications infrastructure where calibration-free operation and bus scalability are critical.

FAQ

What is the maximum operating temperature range specified for the TMP275AID?

The TMP275AID is fully specified from −40°C to +125°C, with absolute maximum ratings extending to −55°C to +127°C. This range is validated per JEDEC JESD22-A108 and supported by thermal characterization data including RθJA = 120°C/W for SOIC-8. The TMP275AID maintains ±0.5°C accuracy from −20°C to 100°C and ±1°C from −40°C to 125°C - making it suitable for demanding industrial and computing thermal management applications.

Does the TMP275AID require external components for basic operation?

No, the TMP275AID requires no external components for fundamental temperature sensing. Only two external 4.7-kΩ pullup resistors on SDA and SCL lines and a 0.01-µF bypass capacitor on V+ are recommended per TI's layout guidelines. The internal bandgap sensor, ΔΣ ADC, oscillator, and I²C interface are fully integrated - eliminating need for external references, op-amps, or discrete ADCs. This integration reduces BOM cost and board space while ensuring factory-calibrated accuracy.

How does the ALERT pin function in Comparator Mode versus Interrupt Mode on the TMP275AID?

In Comparator Mode (TM = 0), the ALERT pin on the TMP275AID remains asserted as long as temperature ≥ THIGH and clears only when temperature falls below TLOW - acting as a latched thermal alarm. In Interrupt Mode (TM = 1), ALERT pulses active on crossing either THIGH or TLOW and clears automatically upon host reading the temperature register. Both modes use the same open-drain output requiring a pullup resistor, and the mode is selected via the Configuration Register's TM bit - enabling flexible fault-handling strategies without hardware redesign.

Can multiple TMP275AID devices share the same I²C bus? How many and how is addressing managed?

Yes, up to eight TMP275AID devices can operate on a single I²C/SMBus. Addressing is controlled by three hardware pins - A0, A1, and A2 - each tied to GND or V+ to configure a unique 7-bit slave address in the 1001xxx format (0x48–0x4F). These pins are sampled at power-up or reset and latched, so addresses remain static during operation. No software configuration or EEPROM is required, enabling simple, deterministic multi-sensor deployment without address collision risk.

What is the resolution and conversion time relationship for the TMP275AID at different bit settings?

The TMP275AID supports user-selectable resolution: 9-bit (0.5°C, 27.5 ms typ), 10-bit (0.25°C, 55 ms typ), 11-bit (0.125°C, 110 ms typ), and 12-bit (0.0625°C, 220 ms typ). Conversion time scales approximately linearly with bit count due to ΔΣ oversampling architecture. All resolutions use the same 12-bit register format - unused LSBs are zero-filled - and are configured via the RES[1:0] bits in the Configuration Register. This flexibility allows designers to optimize for speed in dynamic thermal environments or precision in stable monitoring applications.