Texas Instruments TMP103FYFFR

Overview

TMP103FYFFR 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 (–10°C to 100°C), 8-bit resolution, and 1.4 V to 3.6 V supply range. It serves as a system-level thermal monitor in space-constrained, battery-powered devices requiring multi-zone temperature profiling.

For engineers reviewing the TMP103FYFFR datasheet, TMP103FYFFR pinout, TMP103FYFFR application, or TMP103FYFFR equivalent, key selection criteria include its 26 ms conversion time, 1 μA shutdown current, MDA (Multiple Device Access) support for up to eight parallel sensors, and 0.76 mm × 0.76 mm WCSP footprint - all critical for thermal management in ultra-thin mobile and storage platforms.

Technical Context

The TMP103FYFFR implements a diode-based on-die temperature sensor with successive-approximation ADC, integrated oscillator, and programmable configuration register controlling conversion rate (0.25–8 Hz), shutdown/one-shot/continuous modes, and temperature window watchdog (THIGH/TLOW registers). Its serial interface supports both standard (≤400 kHz) and high-speed (≤3.4 MHz) I²C timing.

It operates across –40°C to 125°C, with thermal path optimized through metal bumps for accurate die-temperature measurement. The device uses a fixed 7-bit slave address (1110xxx per variant), where TMP103FYFFR corresponds to TMP103F (1110101), enabling deterministic multi-sensor bus addressing without external jumpers or resistors.

Key Specifications

Pinout & Package

Package: 4-ball DSBGA (YFF), 0.76 mm × 0.76 mm, 0.4 mm pitch, bottom-side solderable. Thermal resistance R_θJA = 160°C/W enables passive thermal dissipation in thin PCB stacks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM75BIMM/NOPB and MAX31875RTA+, TMP103FYFFR delivers optimal trade-off of ultra-small size, multi-device bus efficiency, and microamp-level shutdown current - making it uniquely suitable for thermal-aware portable and embedded systems where board area and battery life are primary constraints.

Availability

TMP103FYFFR is available at Aetrix Electronics and suitable for SSD thermal management, notebook CPU throttling, smartphone baseband profiling, telecom line card monitoring, and set-top box environmental sensing requiring stable component supply across production lifecycles.

Supply support for TMP103FYFFR 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 specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in precision sensing and low-power design.

The TMP103 product line was engineered specifically for space-constrained, battery-operated systems needing reliable, multi-node thermal visibility - targeting mobile, storage, and infrastructure applications where traditional TO-92 or SOIC sensors are physically or energetically impractical.

FAQ

What is the exact I²C slave address for TMP103FYFFR?

The TMP103FYFFR corresponds to the TMP103F variant, with a fixed 7-bit I²C slave address of 1110101 (0x75 in hexadecimal). This address is hardwired and cannot be changed externally. The full 8-bit address byte sent by the master includes the R/W bit (0 for write, 1 for read), resulting in 0xEA for write and 0xEB for read operations. No external address pins or resistors are required.

Does TMP103FYFFR support SMBus Alert Response Address (ARA)?

No, TMP103FYFFR does not support SMBus Alert Response Address (ARA) functionality. It implements only standard I²C/SMBus slave protocols including general call reset and MDA commands, but lacks dedicated alert pin or ARA hardware. Thermal alerts must be polled via the FH/FL flag bits in the configuration register or detected through periodic register reads.

Can TMP103FYFFR measure ambient air temperature accurately?

TMP103FYFFR measures die temperature, not ambient air temperature. Its thermal path is dominated by conduction through solder bumps, making it highly sensitive to PCB and adjacent IC heating. For air temperature estimation, the device must be thermally isolated (e.g., mounted on thin flex, elevated above board) and calibrated against reference sensors - TI explicitly recommends avoiding direct air exposure for accuracy-critical use cases.

What is the maximum number of TMP103FYFFR devices that can share one I²C bus?

Up to eight TMP103 devices - including TMP103FYFFR - can operate on a single I²C bus using their unique factory-programmed addresses (TMP103A–H). The TMP103FYFFR (TMP103F) occupies address 0x75, leaving seven other addresses available. Bus capacitance and pullup strength must remain within I²C specification limits (≤400 pF total), typically requiring 2.2–4.7 kΩ pullups for eight devices.

Is there a recommended bypass capacitor value for TMP103FYFFR?

Yes, TI specifies a 0.01 μF ceramic bypass capacitor between V+ and GND, placed as close as possible to the TMP103FYFFR package balls. This capacitor stabilizes the supply during conversion events and suppresses high-frequency noise coupling from the I²C bus. Larger values (e.g., 0.1 μF) are not recommended, as they may slow voltage ramp-up during power-on and affect startup timing.