(ACTIVE) ±1.5°C Temperature Sensor with SPI Interface


Functional diagram

Typical Application

Typical Performance


The LM71 is a low-power, high-resolution digital temperature sensor with an SPI and MICROWIRE compatible interface, available in the 5-pin SOT-23 or the 6-pin WSON (no pull back) package. The host can query the LM71 at any time to read temperature. Its low operating current is useful in systems where low power consumption is critical.

The LM71 has 13-bit plus sign temperature resolution (0.03125°C per LSB) while operating over a temperature range of −40°C to +150°C.

The LM71’s 2.65V to 5.5V supply voltage range, fast conversion rate, low supply current, and simple SPI interface make it ideal for a wide range of applications. The LM71Q is available in the 5-lead SOT-23 package only.


  • LM71Q is AEC-Q100 Grade 0 Qualified and is Manufactured on an Automotive Grade Flow
  • 5-Pin SOT-23 Package or 6-Pin No-Pull-Back WSON Package
  • Operates Over a Full −40°C to +150°C Range
  • SPI and MICROWIRE Bus Interface

Key Specifications

  • Supply Voltage: 2.65V to 5.5V
  • Supply Current
    • Operating: 300 µA (typ)
    • 550 µA (max)
  • Temperature Accuracy
    • −10°C to +65°C: ±1.5°C (max)
    • −40°C to 150°C: +3/− 2°C (max)
  • Termperature Resolution: 31.25 m°C

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Interface SPI, Microwire    
Local Sensor Accuracy (Max) (+/- C) 1.5    
Temp Resolution (Max) (bits) 14    
Operating Temperature Range (C) -40 to 150    
Supply Voltage (Min) (V) 2.65    
Supply Voltage (Max) (V) 5.5    
Supply Current (Typ) (uA) 300    
Supply Current (Max) (uA) 550    
Special Features Shutdown    
Addresses NA    
Rating Catalog    
Package Group SOT-23^WSON    
Package Size (mm2=WxL) 5SOT-23: 8 mm2: 2.8 x 2.9^6WSON: 9 mm2: 3 x 3    
Approx. Price (US$) 0.71 | 1ku    
Iq (Typ) (uA) 300    

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