Digital Thermometer and Thermostat

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The DS1620 Digital Thermometer and Thermostat provides 9-bit temperature readings which indicate the temperature of the device. With three thermal alarm outputs, the DS1620 can also act as a thermostat. THIGH is driven high if the DS1620's temperature is greater than or equal to a user-defined temperature TH. TLOW is driven high if the DS1620's temperature is less than or equal to a user-defined temperature TL. TCOM is driven high when the temperature exceeds TH and stays high until the temperature falls below that of TL.

User-defined temperature settings are stored in nonvolatile memory, so parts can be programmed prior to insertion in a system, as well as used in standalone applications without a CPU. Temperature settings and temperature readings are all communicated to/from the DS1620 over a simple 3-wire interface.
DS1620: Functional Block Diagram DS1620: Functional Block Diagram Enlarge+

Key Features

  • Simply Adds Temperature Monitoring and Control to Any System
    • Measures Temperatures From -55°C to +125°C in 0.5°C Increments; Fahrenheit Equivalent is -67°F to +257°F in 0.9°F Increments
    • Temperature is Read as a 9-Bit Value
    • Converts Temperature to Digital Word in 750ms (max)
    • Thermostatic Settings are User-Definable and Nonvolatile
  • Can Be Used in a Wide Variety of Applications
    • Supply Voltage Range Covers From 2.7V to 5.5V
    • Data is Read From/Written Via a 3-Wire Serial Interface (CLK, DQ, Active-Low RST )
  • Saves Space
    • Requires No External Components
    • 8-Pin DIP or SOIC (208-mil) Packages


  • Consumer Products
  • Industrial Systems
  • Thermometers
  • Thermostatic Controls

See parametric specs for Temperature Sensors (113)

Part NumberSensor TypeFunctionsInterfaceChannelsAccuracy
Parasite Pwr.Temp. Thresh.Temp. Resolution
Oper. Temp.
See Notes
DS1620 Local
Dual Temperature Alarms
Standalone Thermostat
One0.5NoProgrammable (NV)9-55 to +125
SOIC (W)/8
$3.39 @1k

See parametric specs for Temperature Switches (19)

Part NumberTemp. Thresh.
DS1620 Programmable
See Data Sheet

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.

Tools & Models

  • DS1620 IBIS Model
  • Product Reliability Reports: DS1620.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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