REF31-Q1 Automotive 20-ppm/°C (max), 100-µA, 3-pin SOT-23 series voltage reference |

REF31-Q1 (ACTIVE) Automotive 20-ppm/°C (max), 100-µA, 3-pin SOT-23 series voltage reference



The REF31xx-Q1 is a family of precision, low power, low dropout, series voltage references available in the tiny 3-pin SOT-23 package.

The REF31xx-Q1 small size and low power consumption (100 µA typical) make it ideal for portable and battery-powered applications. The REF31xx-Q1 does not require a load capacitor, but is stable with any capacitive load and can sink or source up to 10 mA of output current.

Unloaded, the REF31xx-Q1 can operate on supplies down to 5 mV above the output voltage. All models are specified for the wide temperature range of –40°C to +125°C.


  • AEC-Q100 Qualified With the Following Results:
    • Device TA Range: –40°C to 125°C
    • Device HBM ESD Classification Level H1C
    • Device CDM ESD Classification Level C4A
  • High Accuracy: 0.2% Maximum
  • Excellent Specified Drift Performance:
    • 20 ppm/°C (Maximum) from –40°C to +125°C
  • High Output Current: ±10 mA
  • Low Dropout: 5 mV
  • Low IQ: 115 µA Maximum
  • Low Noise: 17 µVp-p/V
  • No Output Capacitor Required
  • Available Voltage Options : 1.2 V, 2 V, 2.5 V, 3 V, 3.3 V, 4 V
  • MicroSize Package: 3-Pin SOT-23

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Part number Order VO (V) Initial accuracy (Max) (%) Temp coeff (Max) (ppm/ degree C) Rating Operating temperature range (C) Iout/Iz (Max) (mA) Iq (Typ) (uA) Iq (Max) (uA) Package Group Vin (Min) (V) Vin (Max) (V)
REF31-Q1 Order now 1.25
0.2     20     Automotive     -40 to 125     10     100     115     SOT-23 | 3     1.3     5.5    
REF3125 Order now 2.5     0.2     15
Catalog     -40 to 125     10     100     115     SOT-23 | 3     2.55     5.5