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Manufacturer Part #


MIC280 Series 3.6 V SMT Precision IttyBitty™ Thermal Supervisor - SOT-23-6

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Mfr. Name: Microchip
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Product Specification Section
Microchip MIC280-4YM6-TR - Technical Attributes
Attributes Table
Output Type: Digital
Supply Voltage: 3V to 3.6V
Operating Temp Range: -55°C to +125°C
Interface Type: SMBUS
Package Style:  SOT-23-6 (SOT-26)
Mounting Method: Surface Mount
$Features & Applications

The MIC280-4YM6 TR is a digital thermal supervisor capable of measuring its own internal temperature and that of a remote PN junction. The remote junction may be an inexpensive commodity transistor, e.g., 2N3906, or an embedded thermal diode such as found in Intel Pentium* II/III/IV CPUs, AMD Athlon* CPUs, and Xilinx Virtex* FPGA's.

A 2-wire SMBus* 2.0 compatible serial interface is provided for host communication. Remote temperature is measured with ±1°C accuracy and 9-bit to 12-bit resolution (programmable). Independent high, low, and over-temperature thresholds are provided for each zone. The advanced integrating A/D converter and analog front-end reduce errors due to noise for maximum accuracy and minimum guardbanding. The interrupt output signals temperature events to the host, including data-ready and diode faults. Critical device settings can be locked to prevent changes and insure failsafe operation. The clock, data, and interrupt pins are 5 V-tolerant regardless of the value of VDD. They will not clamp the bus lines low even if the device is powered down. Superior accuracy, failsafe operation, and small size make the MIC280 an excellent choice for the most demanding thermal management applications.

Key Features:

  • Measures local and remote temperature.
  • Highly accurate remote sensing ±1°C max., 60°C to 100°C.
  • Superior noise immunity for reduced temperature guardbands.
  • 9-bit to 12-bit temperature resolution for remote zone.
  • Fault queues to further reduce nuisance tripping.
  • Programmable high, low, and over-temperature thresholds for each zone.
  • SMBus 2 compatible serial interface including device timeout to prevent bus lockup.
  • Voltage tolerant I/O’s.
  • Open-drain interrupt output pin - supports SMBus Alert Response Address protocol.
  • Low power shutdown mode.
  • Locking of critical functions to insure failsafe operation.
  • Failsafe response to diode faults.
  • Enables ACPI compliant thermal management.
  • 3.0 V to 3.6 V power supply range.
  • IttyBitty™ SOT23-6 package.


  • Desktop, server and notebook computers.
  • Printers and copiers.
  • Test and measurement equipment.
  • Thermal supervision of Xilinx Virtex FPGA's.
  • Wireless/RF systems.
  • Intelligent power supplies.
  • Datacom/telecom cards.
Pricing Section
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Factory Lead Time:
52 Weeks
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