View max6501-max6504 datasheet:

19-1280; Rev 3; 11/01 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 ________________General Description ____________________________Features The MAX6501–MAX6504 low-cost, fully integrated tem- ±0.5°C (typical) Threshold Accuracy Over perature switches assert a logic signal when their die Full Temperature Range temperature crosses a factory-programmed threshold. No External Components Required Operating from a +2.7V to +5.5V supply, these devices Low Cost feature two on-chip, temperature-dependent voltage references and a comparator. They are available with 30µA Supply Current factory-trimmed temperature trip thresholds from -45°C Factory-Programmed Thresholds from to +115°C in 10°C increments, and are accurate to -45°C to +115°C in 10°C