Texas Instruments TMP103AYFFR

Overview

TMP103AYFFR from Texas Instruments is a low-power, digital temperature sensor in a 4-ball DSBGA (WCSP) package, delivering ±1°C typical accuracy from –10°C to 100°C, 8-bit resolution, and I²C/SMBus-compatible two-wire interface - used for thermal monitoring in space-constrained, battery-powered zones such as SSD controller die proximity or mobile SoC thermal throttling.

For engineers reviewing the TMP103AYFFR datasheet, TMP103AYFFR pinout, TMP103AYFFR application, or TMP103AYFFR equivalent, this page delivers verified electrical specs, MDA-enabled multi-sensor bus architecture, shutdown current (≤1 µA), conversion rate configurability (0.25–8 Hz), and WCSP thermal path behavior critical for PCB-level thermal design validation.

Technical Context

The TMP103AYFFR implements a monolithic diode-based temperature sensing element with on-chip 8-bit ADC and digital control logic, operating exclusively as an I²C/SMBus slave with no master capability. Its Multiple Device Access (MDA) protocol enables global read/write commands across up to eight parallel devices using unique 7-bit slave addresses (TMP103A = 0x70), eliminating per-device address overhead.

It supports three functional modes: Shutdown (≤1 µA), One-Shot (26 ms conversion, auto-return), and Continuous Conversion (configurable via CR1/CR0 bits at 0.25/1/4/8 Hz). The device uses internal oscillator timing - no external clock required - and features integrated spike suppression filters on SDA/SCL for noise immunity in noisy embedded environments.

Key Specifications

Pinout & Package

Package: 4-ball DSBGA (YFF), 0.76 mm × 0.76 mm, bottom-side solder terminals. Thermal path optimized through metal bumps - requires careful PCB thermal isolation for ambient air measurement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX31875RTA+ and STTS751-HPFYy, the TMP103AYFFR uniquely combines MDA-enabled bus efficiency, sub-1-µA shutdown, and WCSP size - making it optimal for high-density, multi-zone, battery-sensitive designs where firmware simplicity and PCB real estate are constrained.

Availability

TMP103AYFFR is available at Aetrix Electronics and suitable for SSD thermal management, notebook CPU throttling, telecom module monitoring, set-top box power supply sensing, and industrial edge node environmental monitoring requiring stable component supply across long production lifecycles.

Supply support for TMP103AYFFR 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, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer market reach.

The TMP103 series was designed specifically for ultra-low-power, multi-node thermal monitoring in space-constrained electronics - targeting SSDs, mobile computing, and telecom infrastructure where traditional TO-92 or SOIC sensors cannot fit.

FAQ

What is the exact I²C slave address of TMP103AYFFR?

The TMP103AYFFR has a fixed 7-bit I²C slave address of 0x70 (1110000b), as defined for the TMP103A variant in TI's official documentation. This address is hardwired and cannot be changed via pins or registers. It supports both standard-mode (100 kHz) and fast-mode (400 kHz) I²C communication, and is fully compatible with SMBus 2.0 timing requirements. The address is used in all read/write transactions involving the TMP103AYFFR.

Does TMP103AYFFR support true hardware interrupts for temperature threshold events?

No, the TMP103AYFFR does not feature a dedicated hardware interrupt pin. Instead, it provides flag bits (FH and FL) in its configuration register that indicate whether measured temperature exceeds THIGH or falls below TLOW. The host MCU must poll these flags via I²C - though the MDA capability allows efficient global polling of multiple TMP103AYFFR devices. No external interrupt signal is generated by the TMP103AYFFR itself.

Can TMP103AYFFR be used to measure ambient air temperature accurately?

Direct ambient air measurement with TMP103AYFFR is not recommended due to its thermal coupling through package bumps to the PCB. The device measures its own die temperature, which closely tracks board temperature when soldered. For air temperature, TI advises isolating the package from conductive/convective paths - e.g., mounting on a thermally insulated flex tail or using forced airflow - and characterizing offset empirically. The TMP103AYFFR datasheet explicitly warns against assuming die temperature equals ambient air temperature without calibration.

What is the maximum number of TMP103AYFFR devices that can share one I²C bus?

Up to eight TMP103 devices - including TMP103AYFFR - can operate on a single I²C bus using their unique slave addresses (0x70 to 0x77). The TMP103AYFFR occupies address 0x70 as the "A" variant. All eight support MDA commands, allowing simultaneous register writes or reads. Bus capacitance and pullup strength must remain within I²C specifications (≤400 pF total, 2.2–10 kΩ pullups), especially at 3.4 MHz high-speed mode.

Is there a difference in accuracy between TMP103AYFFR and other TMP103 variants like TMP103BYFFR?

No - accuracy specifications (±1°C typical from –10°C to 100°C, ±3°C max from –40°C to 125°C) are identical across all TMP103 variants including TMP103AYFFR, TMP103BYFFR, and TMP103CYFFR. The only functional difference is the hardwired 7-bit slave address (0x70 for A, 0x71 for B, 0x72 for C), enabling parallel bus operation. Electrical, thermal, and timing characteristics are fully consistent across the family per TI's SBOS545D datasheet.