Tiny temp monitor for dense boards
The TMP104YFFR is a digital local temperature sensor from Texas Instruments that reports the die temperature over a single-wire SMAART Wire bus. It fits into a 1x1 mm 4-DSBGA package — small enough to place right next to a hot IC on a space-constrained PCB. Accuracy is ±2°C typical, ±3°C maximum across the full range.
Supply and signal — low-voltage, single-wire
The SMAART Wire output is a bidirectional open-drain bus — one wire carries both data and clock, saving a pin on the host MCU. Resolution is 8 bits — that's 1°C per LSB, adequate for thermal monitoring where you care about a few degrees of margin, not tenths. The One-Shot feature lets you take a single reading and shut down the sensor between measurements, dropping quiescent current to near zero.
Active production, no replacement drama
The 4-DSBGA package is a wafer-level chip-scale package — no exposed pad, no external components required beyond a pull-up resistor on the SMAART Wire bus.