Dual-Output Remote-Junction Temperature Switches

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MAX6685/MAX6686 are dual-output temperature switches that use an external diode-connected transistor as a sensing element. These devices have two logic outputs (THIGH and TLOW). THIGH asserts a logic signal when the remote temperature crosses the factory-programmed, +120°C, or +125°C upper trip threshold. TLOW is asserted when the remote temperature exceeds the lower threshold, which is controlled by pins S1 and S2. The lower thresholds are available in two ranges in 5°C increments. The two ranges are +40°C to +80°C and +75°C to +115°C. Hysteresis for both outputs to be deasserted is typically 5°C.

THIGH is an open-drain, active-low output for both the MAX6685 and the MAX6686. TLOW is a CMOS push-pull, active-high output for the MAX6685 and is an open-drain, active-low output for the MAX6686. They are available in a space-saving 8-pin µMAX package.
MAX6685, MAX6686: Typical Operating Circuit MAX6685, MAX6686: Typical Operating Circuit Enlarge+

Key Features

  • Pin-Programmed Lower Temperature Threshold from +40°C to +80°C or +75°C to +115°C (5°C Increments)
  • Preset Upper Threshold: +120°C or +125°C
  • Open-Drain, Active-Low Output for Upper Temperature Alarm
  • CMOS Push-Pull, Active-High or Open-Drain, Active-Low Output for Lower Temperature Alarm
  • 1.5°C Accuracy
  • 3.0V to 5.5V, 200µA Supply
  • 8-Pin µMAX Package
  • Applications/Uses

    • CPU Temperature Protection
    • Fan Control
    • FPGA Temperature Protection
    • Multichip Modules

    See parametric specs for Temperature Switches (19)

    Part NumberSwitch TypeFunctionsInterfaceAccuracy
    Temp. Thresh.
    See Notes
    MAX6686 RemoteDual Output Temperature SwitchLogic1
    T(High): +120°C or +125°C
    T(Low): +40°C to +115°C in 5°C increments
    $1.44 @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
    Request Reliability Report for: MAX6685 
    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.

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