Dual Output Temperature Switch - LM56


Dual Output Temperature Switch

Recommended alternative parts

  • LM57  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Resistor programmable dual trip point with analog ouput


The LM56 is a precision low power thermostat. Two stable temperature trip points (VT1 and VT2) are generated by dividing down the LM56 1.250V bandgap voltage reference using 3 external resistors. The LM56 has two digital outputs. OUT1 goes LOW when the temperature exceeds T1 and goes HIGH when the the temperature goes below (T1–THYST). Similarly, OUT2 goes LOW when the temperature exceeds T2 and goes HIGH when the temperature goes below (T2–THYST). THYST is an internally set 5°C typical hysteresis.

The LM56 is available in an 8-lead VSSOP surface mount package and an 8-lead SOIC.


  • Digital Outputs Support TTL Logic Levels
  • Internal Temperature Sensor
  • 2 Internal Comparators with Hysteresis
  • Internal Voltage Reference
  • Available in 8-pin SOIC and VSSOP Packages

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Parametrics Compare all products in Thermostat/Temperature Switch

# Comparators
Output Type
SetPoint Type
Sensor Gain (mV/Deg C)
Operating Temperature Range (C)
Approx. Price (US$)
Open Drain    
Resistor Programmable    
-40 to 125    
0.66 | 1ku    

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