Texas Instruments TMP468AIRGTR

Overview

TMP468AIRGTR from Texas Instruments is a 9-channel (1-local + 8-remote) high-accuracy digital temperature sensor in a 16-pin VQFN package, operating from 1.7 V to 3.6 V supply, delivering ±0.75°C remote accuracy and 0.0625°C resolution for thermal monitoring of multi-core processors and FPGAs in servers and telecom equipment.

For engineers reviewing the TMP468AIRGTR datasheet, TMP468AIRGTR pinout, TMP468AIRGTR application, or TMP468AIRGTR equivalent, this page provides verified pin functions, real-world thermal zone mapping, SMBus/I²C interface timing constraints, and validated alternative parts for system-level thermal management design.

Technical Context

The TMP468AIRGTR integrates a local BJT sensor and eight independent remote diode measurement channels with programmable η-factor correction, series resistance cancellation up to 1 kΩ, and dual open-drain THERM/THERM2 outputs for overtemperature event signaling. It supports two-wire communication at up to 2.56 MHz (high-speed mode) with 0.0625°C resolution across all nine zones.

Each channel features independently configurable high/low temperature thresholds and hysteresis registers, enabling zone-specific thermal throttling decisions without host processor intervention. The device uses a 13-bit ADC with two's-complement output format and includes register lock functionality to prevent accidental configuration changes.

Key Specifications

Pinout & Package

Package: 16-pin VQFN (RGT), 3.0 mm × 3.0 mm body size, exposed thermal pad - optimized for thermal dissipation and PCB space efficiency in dense compute modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-zone temperature sensing applications.

Compared with TMP468AIRGTR, TMP451AIRTER offers higher channel density per mm² but omits local sensing and dual-alert capability, while LM95235EIMMX/NOPB provides simpler integration at the expense of accuracy, flexibility, and scalability - making TMP468AIRGTR optimal for complex, high-reliability thermal architectures.

Availability

TMP468AIRGTR is available at Aetrix Electronics and suitable for server thermal management, telecom baseband unit cooling, and high-performance computing applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for TMP468AIRGTR 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 signal chain solutions.

The TMP468AIRGTR belongs to TI's high-accuracy temperature sensor product line, designed specifically for thermal monitoring in multi-processor systems where tight accuracy, low power, and robust remote diode compensation are critical.

FAQ

What is the maximum remote junction temperature supported by the TMP468AIRGTR?

The TMP468AIRGTR supports remote diode junction temperatures from –55°C to +150°C, as specified in the Recommended Operating Conditions table. This range enables reliable thermal monitoring of high-power components such as CPUs, GPUs, and RF power amplifiers under extreme operational conditions. The device maintains ±0.75°C accuracy across this full range when used with appropriate remote transistor selection and layout practices.

Does the TMP468AIRGTR require external components for basic operation?

Yes, the TMP468AIRGTR requires a 0.1 µF ceramic bypass capacitor between V+ and GND, plus pullup resistors on SCL and SDA lines (to 1.7–3.6 V). The THERM and THERM2 outputs also require external pullup resistors if used. No external compensation components are needed for series resistance cancellation or η-factor correction - these functions are fully integrated and programmable within the TMP468AIRGTR.

How many unique I²C addresses does the TMP468AIRGTR support?

The TMP468AIRGTR supports four unique I²C addresses, selected via the ADD pin tied to GND, V+, SDA, or SCL. This allows up to four TMP468AIRGTR devices to share the same two-wire bus without address conflict - essential for large-scale thermal monitoring in multi-slot servers or modular telecom chassis where each slot requires independent temperature visibility.

Can the TMP468AIRGTR measure temperature without a remote diode?

Yes, the TMP468AIRGTR can operate using only its local BJT temperature sensor even when all eight remote channels are unused. In this configuration, D1+ through D8+ must be left unconnected or tied to D− as specified, and the device delivers ±0.75°C local accuracy over –40°C to +125°C ambient. The local sensor remains fully functional for ambient or package-level thermal monitoring without any remote diode present.

What is the conversion time per channel for the TMP468AIRGTR in one-shot mode?

In one-shot conversion mode, the TMP468AIRGTR requires 16–17 ms per channel (local or remote), as documented in the Electrical Characteristics table. This timing applies to each individual measurement cycle and is consistent across all nine channels. For continuous monitoring of all channels, total conversion time scales linearly - e.g., measuring all eight remote channels plus local takes approximately 152–153 ms at default settings.