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AD22105:  Low Voltage, Resistor Programmable Thermostatic Switch

Product Details

The AD22105 is a solid state thermostatic switch. Requiring only one external programming resistor, the AD22105 can be set to switch accurately at any temperature in the wide operating range of -40°C to +150°C. Using a novel circuit architecture, the AD22105 asserts an open collector output when the ambient temperature exceeds the user-programmed setpoint temperature. The AD22105 has approximately 4°C of hysteresis which prevents rapid thermal on/off cycling.

The AD22105 is designed to operate on a single power supply voltage from +2.7 V to +7.0 V facilitating operation in battery powered applications as well as in industrial control systems. Because of low power dissipation (230 µW @ 3.3 V), self-heating errors are minimized and battery life is maximized.

An optional internal 200 k(ohm) pull-up resistor is included to facilitate driving light loads such as CMOS inputs.

Alternatively, a low power LED indicator may be driven directly.


  • User-Programmable Temperature Setpoint
  • 2.0°C Setpoint Accuracy
  • 4.0°C Preset Hysteresis
  • Wide Supply Range
    (+2.7 Vdc to +7.0 Vdc)
  • Wide Temperature Range
    (- 40°C to +150°C)

Typical Application Diagram for AD22105


Title Content Type File Type
AD22105: Single-Supply Sensor Interface Amplifier Data Sheet  (Rev 0, 01/1996) (pdf, 262 kB) Data Sheets PDF
ADT7301: Accurate, SPI-Compatible Temperature Sensor in SOT Package  (htm)
(analogZone September 1, 2003)
Product Reviews HTM
Selection Guide: Temperature Sensors  (pdf, 807 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

AD22105 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD22105AR Status: Production 8 ld SOIC 8 Comm. Tube, 98 $1.68 $1.33 N  Material Info PCN Purchase
AD22105AR-REEL Status: Production 8 ld SOIC 8 Comm. Reel, 2500 $1.68 $1.33 N  Material Info PCN Purchase
AD22105AR-REEL7 Status: Production 8 ld SOIC 8 Comm. Reel, 1000 $1.68 $1.33 N  Material Info PCN Purchase
AD22105ARZ Status: Production 8 ld SOIC 8 Comm. Tube, 98 $1.53 $1.21 Y  Material Info PCN Purchase
AD22105ARZ-REEL Status: Production 8 ld SOIC 8 Comm. Reel, 2500 $1.53 $1.21 Y  Material Info PCN Purchase
AD22105ARZ-REEL7 Status: Production 8 ld SOIC 8 Comm. Reel, 1000 $1.53 $1.21 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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