Analog temperature sensing for board-level thermal monitoring
The LM19CIZ/LFT4 is an analog local temperature sensor from Texas Instruments, producing a voltage output that scales linearly at 11.77 mV/°C across its rated range of -55°C to 130°C — this is the slope a system ADC must be calibrated to read, not a ratiometric reference.
Supply voltage and power-down flexibility
The integrated shutdown mode pulls the quiescent current to near-zero, letting a microcontroller gate the sensor between readings — useful in duty-cycled telemetry where the sensor's own draw would otherwise dominate the sleep budget.
Temperature range and accuracy for harsh environments
Accuracy is specified as ±2.5°C typical and ±3.8°C maximum over the full range — the ±3.8°C worst-case figure is the value to budget into the system error stack, not the typical number, especially when the sensor is used near the upper or lower extremes where the transfer curve flattens.
Through-hole TO-92 package and ordering options
Housed in a TO-92-3 (TO-226AA) through-hole package, the sensor mounts directly into a PCB with 0.100-inch pitch holes — the three leads (V+, GND, VOUT) match the standard transistor footprint, so a board already using TO-92 BJTs or diodes can accept this part without a layout change. Available in both Tape & Box (TB) and Cut Tape (CT) formats, the TB option ships as a full reel for automated insertion, while CT suits prototype or low-volume builds where only a few pieces are needed.