(ACTIVE) ±1.25°C Temperature Sensor with SPI Interface


Functional diagram

Typical Application

Typical Performance


The LM74 is a temperature sensor, Delta-Sigma analog-to-digital converter with an SPI and MICROWIRE compatible interface. The host can query the LM74 at any time to read temperature. A shutdown mode decreases power consumption to less than 10 μA. This mode is useful in systems where low average power consumption is critical.

The LM74 has 12-bit plus sign temperature resolution (0.0625°C per LSB) while operating over a temperature range of −55°C to +150°C.

The LM74's 3.0V to 5.5V supply voltage range, low supply current and simple SPI interface make it ideal for a wide range of applications. These include thermal management and protection applications in hard disk drives, printers, electronic test equipment, and office electronics. The LM74 is available in the SOIC package as well as the 5-Bump DSBGA package.


  • 0.0625°C Temperature Resolution
  • Shutdown Mode Conserves Power Between Temperature Reading
  • SPI and MICROWIRE Bus Interface
  • 5-Bump DSBGA Package Saves Space

Key Specifications

  • Supply Voltage 3.0V or 2.65V to 5.5V
  • Supply Current
    • Operating265μA (typ)520μA (max)
    • Shutdown3μA (typ)
  • Temperature Accuracy
    • −10°C to 65°C, ±1.25°C(max)
    • −25°C to 110°C, ±2.1°C(max)
    • −55°C to 125°C, ±3°C(max)

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Interface SPI, Microwire    
Local Sensor Accuracy (Max) (+/- C) 1.25    
Temp Resolution (Max) (bits) 13    
Operating Temperature Range (C) -40 to 125^-55 to 150    
Supply Voltage (Min) (V) 2.65^3    
Supply Voltage (Max) (V) 5.5    
Supply Current (Typ) (uA) 265    
Supply Current (Max) (uA) 470    
Special Features Shutdown    
Addresses NA    
Rating Catalog    
Package Group DSBGA^SOIC    
Package Size (mm2=WxL) 8SOIC: 29 mm2: 6 x 4.9    
Approx. Price (US$) 0.65 | 1ku    
Iq (Typ) (uA) 265    

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Technical Documents

Datasheet (1)

Application notes (3)

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