±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm

Industry's Smallest ±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm

Please check latest availability status for a specific part variant.


The MAX6642 precise, two-channel digital temperature sensor accurately measures the temperature of its own die and a remote PN junction and reports the temperature data over a 2-wire serial interface. The remote PN junction is typically a substrate PNP transistor on the die of a CPU, ASIC, GPU, or FPGA. The remote PN junction can also be a discrete diode-connected small-signal transistor.

The 2-wire serial interface accepts standard system management bus (SMBus™), Write Byte, Read Byte, Send Byte, and Receive Byte commands to read the temperature data and to program the alarm thresholds. To enhance system reliability, the MAX6642 includes an SMBus timeout. The temperature data format is 10 bits with the least significant bit (LSB) corresponding to +0.25°C. The active-low ALERT output asserts when the local or remote overtemperature thresholds are violated. A fault queue can be used to prevent the active-low ALERT output from setting until two consecutive faults have been detected.

Measurements can be done autonomously or in a single-shot mode.

Remote accuracy is ±1°C maximum error between +60°C and +100°C. The MAX6642 operates from -40°C to +125°C, and measures remote temperatures between 0°C and +150°C. The MAX6642 is available in a 6-pin TDFN package with an exposed pad.
MAX6642: Typical Operating Circuit MAX6642: Typical Operating Circuit Enlarge+

Key Features

  • Integrated Temperature Sensor Enables Simultaneous Dual Temperature (Remote and Local) Measurements
    • Remote Accuracy ±1°C
    • Local Accuracy ±2°C from +60°C to +100°C
    • Measures Remote Temperature up to +150°C
    • 0.25°C Resolution
  • Dual Zone Monitoring Automates Over-Temperature Alarms
    • Programmable Remote/Local Temperature Thresholds
    • Active-Low ALERT Output
  • Small Footprint
    • 3mm x 3mm TDFN Package with Exposed Pad
    • Low Thermal Mass Reduces Measurement Latency
    • SMBus/I2C Address Hardwired


  • Desktop Computers
  • Graphic Cards
  • Notebook Computers
  • Servers
  • Test and Measurement Equipment
  • Thin Clients
  • Workstations

See parametric specs for Temperature Sensors (113)

Part NumberSensor TypeAlarm OutputFunctionsInterfaceChannelsAccuracy
Parasite Pwr.Temp. Thresh.Temp. Resolution
Oper. Temp.
See Notes
MAX6642 RemoteAlert
Remote & Local Sensor
Single Temperature Alarm
2-Wire/I2C/SMBusOne1NoProgrammable10-40 to +125
$1.37 @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.

MAX6642EVCMOD2: Evaluation System/Evaluation Kit for the MAX6642
MAX6642EVKIT: Evaluation System/Evaluation Kit for the MAX6642
Product Reliability Reports: MAX6642.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.

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