Texas Instruments TMP103HYFFT

Overview

TMP103HYFFT from Texas Instruments is a low-power, digital temperature sensor in a 4-ball DSBGA (WCSP) package, featuring I²C/SMBus-compatible two-wire interface, ±1°C typical accuracy over –10°C to 100°C, 1°C resolution, and 3-μA active quiescent current at 0.25 Hz conversion rate - used for thermal monitoring in space-constrained mobile and storage devices.

For engineers reviewing the TMP103HYFFT datasheet, TMP103HYFFT pinout, TMP103HYFFT application, or TMP103HYFFT equivalent, key selection criteria include its MDA (Multiple Device Access) capability for global bus reads/writes across up to eight sensors, shutdown current of ≤1 μA, 1.4 V–3.6 V supply range, and zone-specific slave addressing (TMP103H = 1110111).

Technical Context

The TMP103HYFFT implements a diode-based on-die temperature sensing element with 8-bit ADC and integrated oscillator, supporting three functional modes: shutdown (≤1 μA), one-shot (26 ms conversion), and continuous conversion (0.25/1/4/8 Hz via CR1/CR0 bits). Its serial interface includes Schmitt-triggered SCL/SDA inputs with spike suppression and supports fast-mode (up to 400 kHz) and high-speed mode (up to 3.4 MHz) timing.

It features a programmable temperature watchdog with THIGH/TLOW registers, latchable flag bits (FH/FL/LC), and a pointer-register architecture enabling register-level read/write access. The device uses a fixed 7-bit slave address (1110111 for TMP103H variant) with R/W bit, and responds to general-call reset but not to SMBus alert or timeout commands.

Key Specifications

Pinout & Package

Package: 4-ball DSBGA (YFF), 0.76 mm × 0.76 mm, 0.35 mm pitch, bottom-side solderable. Thermal resistance R_θJA = 160°C/W - requires minimal PCB copper area for thermal management in thin-profile designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75BIMM/NOPB and STTS751-2DMR, TMP103HYFFT delivers the smallest footprint and lowest active/shutdown current among these alternatives, making it optimal for battery-powered, multi-sensor thermal architectures where bus efficiency and spatial constraints dominate.

Availability

TMP103HYFFT is available at Aetrix Electronics and suitable for notebook thermal management, SSD controller monitoring, telecom baseband profiling, handset SoC throttling, and set-top box ambient sensing requiring stable component supply across long-lifecycle consumer programs.

Supply support for TMP103HYFFT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TMP103 product line was designed specifically for ultra-compact, ultra-low-power thermal sensing in multi-zone portable and storage systems - prioritizing minimal footprint, MDA-enabled bus efficiency, and sub-1μA shutdown operation.

FAQ

What is the I²C slave address of the TMP103HYFFT?

The TMP103HYFFT uses a fixed 7-bit I²C slave address of 0x77 (binary 1110111), corresponding to the TMP103H variant per TI's device addressing table. This address is hardwired and cannot be changed via pins or registers. When calculating the full 8-bit address byte, the R/W bit is appended - resulting in 0xF0 for write operations and 0xF1 for read operations. The TMP103HYFFT does not respond to general-call writes unless explicitly enabled via configuration register settings.

Does the TMP103HYFFT support SMBus Alert functionality?

No, the TMP103HYFFT does not implement SMBus Alert (SMBALERT#) functionality. It lacks a dedicated interrupt output pin and does not assert an alert signal on bus activity. Thermal event detection relies solely on software polling of the FH/FL flag bits in the configuration register after reading temperature data. For hardware interrupt-driven thermal management, alternative sensors such as the STTS751-2DMR or TMP117 are recommended.

How does Multiple Device Access (MDA) work on the TMP103HYFFT?

MDA on the TMP103HYFFT allows a master controller to issue a single broadcast command that all TMP103 devices on the same I²C bus respond to simultaneously - regardless of their individual slave addresses. The TMP103HYFFT recognizes MDA write commands (0x00) and MDA read commands (0x01) sent to the reserved address 0x00 (General Call). This eliminates sequential addressing overhead, reducing bus transaction time by up to 88% when reading temperature from eight sensors. MDA does not alter the device's native 0x77 address for standard operations.

What is the maximum I²C clock frequency supported by the TMP103HYFFT?

The TMP103HYFFT supports I²C clock frequencies up to 3.4 MHz in high-speed mode when V+ > 1.7 V, and up to 2.75 MHz when V+ < 1.7 V. In standard/fast-mode, it operates from 1 kHz to 400 kHz. Timing parameters including t(LOW), t(HIGH), and t(F) are fully specified across all modes in the datasheet. Note that active quiescent current increases to 85 μA at 3.4 MHz - a trade-off between speed and power that must be evaluated per application.

Can the TMP103HYFFT measure ambient air temperature accurately?

The TMP103HYFFT measures its own die temperature, which closely tracks PCB substrate temperature due to low thermal resistance through package bumps. For accurate ambient air temperature measurement, the device must be thermally isolated from the PCB using elevated mounting, thermal vias, or airflow shielding - otherwise readings reflect board temperature, not ambient. TI recommends avoiding placement near heat sources and using conformal coating only if validated for thermal impact. Accuracy degrades by >2°C if mounted directly on high-copper layers without isolation.