Resistor-Programmable SOT Temperature Switches

Resistor-Programmable Temp Comparators in a SOT23!

Please check latest availability status for a specific part variant.


The MAX6509/MAX6510 are fully integrated, resistor-programmable temperature switches with thresholds set by an external resistor. They require only one external resistor to set the temperature threshold within a wide -40±C to +125±C temperature range. The MAX6509 provides an open-drain output. The MAX6510 features three selectable output options: active-low, active-high, and open drain with an internal pull-up resistor.

These switches operate with a +2.7V to +5.5V single supply while providing a temperature threshold accuracy of ±0.5°C (typ) or ±4.7°C (max). They typically consume 32µA supply current. Hysteresis is pin selectable to 2°C or 10°C.

The MAX6509/MAX6510 are available in 5-pin and 6-pin SOT23 packages, respectively.

MAX6509, MAX6510: Typical Operating Circuit MAX6509, MAX6510: Typical Operating Circuit Enlarge+

Key Features

  • ±0.5°C Threshold Accuracy
  • ±4.7°C (max) Threshold Accuracy (-40°C to +125°C)
  • Temperature Threshold Set by a 1% External Resistor
  • Set-Hot or Set-Cold Option
  • Low 32µA Supply Current
  • Open-Drain, Push-Pull Outputs; Open-Drain with Internal Pull-Up Resistor
  • Pin-Selectable 2°C or 10°C Hysteresis
  • SOT23 Packages


  • µP Temperature Monitoring in High-Speed Computers
  • Fan Control
  • Temperature Alarms
  • Temperature Control

See parametric specs for Temperature Switches (19)

Part NumberSwitch TypeFunctionsInterfaceAccuracy
Temp. Thresh.
See Notes
MAX6509 LocalTemperature Switch/Temperature ComparatorLogic4.7Programmable
$0.92 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Technical Documents

Tutorial 4679 Thermal Management Handbook

Additional Resources

Temperature Family by Product Type
Product Reliability Reports: MAX6509.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


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Type ID Title
Tutorial 4679 Thermal Management Handbook