Temperature Switch IC (Thermostat IC) S-5844A Series

The S-5844A Series is a temperature switch IC (thermostat IC) which detects the temperature with a temperature accuracy of ±2.5°C. The output inverts when temperature reaches the detection temperature. The S-5844A Series restores the output voltage when the temperature drops to the level of release temperature.
The S-5844A Series operates at the lower power supply voltage of 1.65 V and its current consumption is 0.18 µA typ. due to CMOS configuration.
A temperature sensor with the negative temperature coefficient, a reference voltage generation circuit and a comparator are integrated on one chip, and enclosed into the packages SOT-23-5 and SNT-4A, and the super-small package HSNT-4 (1010).


Detection temperature
+50°C to +100°C, +5°C step,
detection accuracy:±2.5°C
Low voltage operation
1.65 V min.
Low current consumption
0.18 µA typ. (Ta = +25°C)
Hysteresis temperature
selectable in 5°C, 10°C, 15°C or 20°C
Selectable output logic in active “H” or “L”
Selectable output form in CMOS or Nch open drain
Lead-free (Sn 100%), halogen-free


  • Fan control
  • Air conditioning system
  • Mobile phone
  • Game consoles
  • Various electronic devices