Texas Instruments TMP103CYFFT

Overview

TMP103CYFFT 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, 8-bit resolution, and 1.4 V to 3.6 V supply range - deployed for thermal monitoring in SSDs, notebooks, and telecom equipment.

For engineers reviewing the TMP103CYFFT datasheet, TMP103CYFFT pinout, TMP103CYFFT application, or TMP103CYFFT equivalent, key selection considerations include its MDA (Multiple Device Access) capability for global bus reads across up to eight devices, 26 ms conversion time, 3 μA active quiescent current at 0.25 Hz, and 0.76 mm × 0.76 mm footprint for ultra-compact thermal sensing nodes.

Technical Context

The TMP103CYFFT implements an on-die diode-based temperature sensor with successive-approximation ADC, integrated oscillator, and configurable register map (THIGH/TLOW, Configuration, Pointer). Its serial interface supports Fast Mode (≤400 kHz) and High-Speed Mode (≤3.4 MHz), with built-in Schmitt triggers and spike suppression on SDA/SCL.

It operates in three functional modes: Shutdown (≤1 μA), One-Shot (single conversion triggered from shutdown), and Continuous Conversion (0.25/1/4/8 Hz via CR1/CR0 bits), with programmable temperature window watchdog using FH/FL flags and latch control (LC bit).

Key Specifications

Pinout & Package

Package: 4-ball DSBGA (YFF), 0.76 mm × 0.76 mm, 0.4 mm pitch - optimized for space-constrained PCB layouts in mobile and embedded modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75BIMM/NOPB and MAX31820MUA+, the TMP103CYFFT delivers superior power efficiency (3 μA vs 250 μA active), smaller footprint (0.58 mm² vs 15.4 mm²), and unique MDA capability - making it optimal for dense, battery-sensitive, multi-zone thermal architectures where bus efficiency and size are critical.

Availability

TMP103CYFFT is available at Aetrix Electronics and suitable for SSD thermal management, notebook CPU throttling, telecom baseband monitoring, industrial PLC module sensing, and low-power environmental sensors requiring stable component supply across production lifecycles.

Supply support for TMP103CYFFT 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 TMP103 product line was designed for ultra-low-power, space-constrained thermal monitoring in portable and high-density electronics - emphasizing minimal board area, sub-μA shutdown current, and scalable multi-device bus architecture.

FAQ

What is the absolute maximum supply voltage rating for TMP103CYFFT?

The absolute maximum supply voltage for TMP103CYFFT is 4 V, as specified in the Absolute Maximum Ratings table. Exceeding this value - even momentarily - may cause permanent damage. The recommended operating range remains 1.4 V to 3.6 V, and the device is fully characterized across this band. Always ensure transient suppression on V+ rail, especially in systems sharing power domains with higher-voltage peripherals. TMP103CYFFT functionality is not guaranteed outside the recommended range.

Does TMP103CYFFT support I²C Fast Mode Plus (1 MHz)?

No, TMP103CYFFT does not support I²C Fast Mode Plus. Its documented timing specifications cover Fast Mode (up to 400 kHz) and High-Speed Mode (up to 3.4 MHz), but the latter requires specific bus conditions including controlled rise/fall times and reduced capacitance. The device's tR/tF limits (300 ns max) and SCL frequency spec of ≤3.4 MHz confirm compatibility with standard High-Speed Mode, not Fast Mode Plus. For 1 MHz operation, consider alternatives like the TMP117. TMP103CYFFT remains fully compliant with standard I²C and SMBus protocols.

How many TMP103CYFFT devices can share the same I²C bus?

Up to eight TMP103CYFFT devices can operate on a single I²C bus using their unique slave addresses (1110000 to 1110111). This is enabled by the Multiple Device Access (MDA) feature, which allows global read/write commands to all devices simultaneously. Address assignment is fixed per variant (TMP103A–H); TMP103CYFFT corresponds to TMP103C (1110010). Bus loading must remain within I²C specification limits - typically ≤400 pF - requiring appropriate pull-up resistor sizing. TMP103CYFFT's open-drain drivers and integrated filters ensure robust multi-drop operation.

What is the thermal resistance (RθJA) of TMP103CYFFT in its DSBGA package?

The junction-to-ambient thermal resistance (RθJA) of TMP103CYFFT in the YFF (4-ball DSBGA) package is 160°C/W, as measured per JEDEC JESD51 standards on a 1S0P test board. This value assumes standard PCB layout with minimal copper pour. Actual RθJA in end applications depends heavily on PCB copper area, layer stack-up, and airflow; adding thermal vias under the GND ball can reduce RθJA by 20–30%. The low RθJA supports accurate self-heating compensation in high-accuracy use cases. TMP103CYFFT's thermal performance is validated across –40°C to 125°C ambient.

Can TMP103CYFFT measure ambient air temperature accurately?

TMP103CYFFT measures its own die temperature, not ambient air temperature directly. Because it uses the silicon substrate as the sensing element, thermal coupling to surrounding materials dominates the reading. To approximate ambient air temperature, the device must be thermally isolated - e.g., mounted on a thin, low-mass PCB section with no nearby heat sources and minimal copper pour. TI recommends avoiding placement near power components or under metal shields. For true ambient sensing, dedicated NTC thermistors or thermopile-based sensors are more appropriate. TMP103CYFFT excels at junction or board-level thermal profiling, not air temperature metrology.