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 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). Please contact National for full specifications over the extended temperature range. The LM4121 is available in a standard 5-pin SOT-23 package.
The LM4121 provides a high‑accuracy 1.25 V reference (or adjustable version) with a typical supply current of 160 µA and power‑down current below 2 µA, making it suitable for battery‑powered and portable applications. It operates from 1.8 V to 12 V and is offered in a 5‑pin SOT‑23 package.
The datasheet details absolute maximum ratings, electrical characteristics such as 0.2 % (A‑grade) output accuracy, 50 ppm/°C temperature coefficient, and typical application circuits including programmable current sources and low‑battery detectors. Industrial temperature range is –40 °C to +85 °C, with an extended range to –40 °C to +125 °C available on request.
| Output Voltage Accuracy (A‑grade) | 0.2 % |
|---|---|
| Input Voltage Range | 1.8 V to 12 V |
| Package | 5‑pin SOT‑23 |
It guarantees specifications from –40 °C to +85 °C (industrial range) and can be qualified for –40 °C to +125 °C on request.
The device is offered with a fixed 1.25 V output and an adjustable version.
It is supplied in a standard 5‑pin SOT‑23 surface‑mount package.