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. It 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 guaranteed 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 guaranteed over the industrial temperature range (−40˚C to +85˚C), while certain specs are guaranteed over the extended temperature range (−40˚C to +125˚C). The LM4121 is available in a standard 5-pin SOT-23 package.
The LM4121 voltage reference provides a stable 1.25 V output (or adjustable) with a typical supply current of 160 µA and a low temperature coefficient of 50 ppm/°C. It operates from 1.8 V to 12 V input and drops to less than 2 µA in power‑down mode, making it suitable for battery‑powered applications.
The device is offered in a 5‑pin SOT‑23 package, available in A‑grade (0.2 % accuracy) and standard grade (0.5 % accuracy). The datasheet includes ordering information, absolute maximum ratings, electrical characteristics, typical operating curves, application circuits and mechanical dimensions.
| Output voltage accuracy (A‑grade) | 0.2 % |
|---|---|
| Supply current (typical) | 160 µA |
| Input voltage range | 1.8 V to 12 V |
| Power‑down current | < 2 µA |
| Package | 5‑pin SOT‑23 |
The typical supply current is 160 µA.
It operates from 1.8 V up to 12 V input.
The LM4121 is supplied in a 5‑pin SOT‑23 surface‑mount package.