LM4121 0.2% 50ppm/°C Drift Precision Series Voltage Reference with Shutdown Enable | TI.com

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.
0.2% 50ppm/°C Drift Precision Series Voltage Reference with Shutdown Enable


Recommended alternative parts

  • LM4120  -  See LM4120 for higher output voltage options
  • LM4051-N  -  Lower Current Shunt Reference


The LM4121 is a precision bandgap voltage reference available in a fixed 1.25V and adjustable version with up to 5 mA current source and sink capability.

This series reference operates with input voltages as low as 1.8V and up to 12V consuming 160 µA (Typ.) supply current. In power down mode, device current drops to less than 2 μA.

The LM4121 comes in two grades A and Standard. The best grade devices (A) have an initial accuracy of 0.2%, while the standard have an initial accuracy of 0.5%, both with a tempco of 50ppm/°C ensured from −40°C to +125°C.

The very low operating voltage, low supply current and power-down capability of the LM4121 makes this product an ideal choice for battery powered and portable applications.

The device performance is ensured over the industrial temperature range (−40°C to +85°C), while certain specs are ensured over the extended temperature range (−40°C to +125°C). Please contact Texas Instruments for full specifications over the extended temperature range. The LM4121 is available in a standard 5-pin SOT-23 package.


  • Small SOT23-5 Package
  • Low Voltage Operation
  • High Output Voltage Accuracy: 0.2%
  • Source and Sink Current Output: ±5 mA
  • Supply current: 160 μA Typ.
  • Low Temperature Coefficient: 50 ppm/°C
  • Enable Pin
  • Output Voltages: 1.25V and Adjustable
  • Industrial Temperature Range: −40°C to +85°C
  • (For Extended Temperature Range, −40°C to 125°C, Contact Texas Instruments)

All trademarks are the property of their respective owners.


Compare all products in Series voltage references Email Download to Excel
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) Shutdown current (Typ) (uA) Iq (Max) (uA) Features Package Group Vin (Min) (V) Vin (Max) (V)
LM4121 Order now 1.25     0.2
50     Catalog     -40 to 85     5     160     2     275     Enable pin     SOT-23 | 5     1.8     12