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DS1621
Digital Thermometer and Thermostat


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Status
Part Number Status
DS1621 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet
FULL DATA SHEET (PDF, 248kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail


Description
The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device. The thermal alarm output, TOUT is active when the temperature of the device exceeds a user-defined temperature TH. The output remains active until the temperature drops below user defined temperature TL, allowing for any hysteresis necessary. User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to insertion in a system. Temperature settings and temperature readings are all communicated to/from the DS1621 over a simple 2-wire serial interface.

Key Features   Applications/Uses
  • Temperature measurements require no external components
  • 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 (2-byte transfer)
  • Wide power supply range (2.7V to 5.5V)
  • Converts temperature to digital word in less than 1 second
  • Thermostatic settings are user definable and nonvolatile
  • Data is read from/written via a 2-wire serial interface (open drain I/O lines)
  • Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermal sensitive system
  • 8-pin DIP or SO package (150mil and 208mil)

 
  • Medical
  • Networking
  • Personal Computing
  • Routers/Switches
  • Test Measurement Systems
  • Wireless Base Stations

    Key Specifications:  Temperature Sensors
    Part Number Sensor Type Functions Interface Accuracy
    (±°C)
    Parasite Pwr. Temp. Thresh. Temp. Resolution
    (bits)
    Multi Droppable Oper. Temp.
    (°C)
    Smallest Available Pckg.
    (mm2)
    Price
    max w/pins See Notes
    DS1621  Local Single Temperature Alarm 2-Wire/I2C/SMBus 0.5 No Programmable (NV)
    9
    10
    11
    12
    Yes -55 to +125 30.9 $1.91 @1k
    See All Temperature Sensors (99)

    Diagram
    DS1621: Functional Block Diagram
    Functional Block Diagram

    Application Notes
  • Application Note 127: Reverse Compatibility of the DS1721 Digital Temperature Sensor with the DS1621 - DS1621
  • Application Note 176: Using the DS1631 Temperature Sensor in DS1621 Applications - DS1621
  • Application Note 3489: Installing the DS9123O USB Adapter on Windows® 98 - DS1621
  • Application Note 3930: Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors - DS1621

    Design Guides
  • Thermal Management (PDF)

    Reliability Reports
  • Reliability Report: DS1621.pdf

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-14 of 14

    DS1621 Free
    Sample
    Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    DS1621C     N/A No Longer Available DS1621S+


    Land Pattern: Not Available

    -55°C to +125°C See data sheet
    DS1621C-A7-W     N/A No Longer Available


    Land Pattern: Not Available

    -55°C to +125°C See data sheet
    DS1621    
    Active
    PDIP(N);8 pin;81.9 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8-4*
    -55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS1621+  
    Active
    PDIP(N);8 pin;79.7 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P8+1*
    -55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1621S+W  
    Active
    SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+2*
    -55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1621S/T&R+W    
    Active
    SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+2*
    -55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1621S    
    Active
    SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    -55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS1621S/T&R    
    Active
    SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8-4*
    -55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS1621S+T&R    
    Active
    SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+2*
    -55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1621V    
    Active
    SOIC (W);8 pin;44.1 mm²

    Land Pattern: Not Available
    Use pkgcode/variation: W8-3*
    -55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS1621S+  
    Active
    SOIC(N);8 pin;30.9 mm²
    Outline Drawing: 21-0041 (PDF)
    Land Pattern: 90-0096 (PDF)
    Use pkgcode/variation: S8+2*
    -55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1621V+  
    Active
    SOIC (W);8 pin;44.1 mm²

    Land Pattern: Not Available
    Use pkgcode/variation: W8+3*
    -55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1621V/T&R    
    Active
    SOIC (W);8 pin;44.1 mm²

    Land Pattern: Not Available
    Use pkgcode/variation: W8-3*
    -55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    DS1621V+T&R    
    Active
    SOIC (W);8 pin;44.1 mm²

    Land Pattern: Not Available
    Use pkgcode/variation: W8+3*
    -55°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • Temperature Family by Product Type

    Related Products
    DS1721 Digital Thermometer and Thermostat
    DS1631, DS1631A, DS1731 High-Precision Digital Thermometer and Thermostat

    More Like This: View Product Families for Similar Products

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    2005-09-15
    This page last modified: 2009-10-23


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