SPX1431 Precision Adjustable Shunt Regulator
The SPX1431 is a 3‑terminal adjustable shunt voltage regulator that provides a highly accurate 2.5 V bandgap reference. It operates as an open‑loop error amplifier with a wide current capability (1 mA to 150 mA) and a temperature range of –55 °C to 125 °C, making it suitable for battery‑operated equipment, switching power supplies, and error‑amplifier applications.
The device is offered in multiple packages—TO‑92, SOIC‑8, SOT‑89, and SOT‑23‑5—allowing designers to select the most appropriate form factor. Typical specifications include 0.4 % reference tolerance, 30 ppm/°C temperature coefficient, and a reference input current of 0.7 pA to 1.9 pA. The datasheet provides detailed absolute‑maximum ratings, electrical characteristics, and test circuits for implementation.
| Output Voltage Range | 0.5 V to 36 V |
|---|---|
| Operating Current Range | 1 mA to 150 mA |
| Operating Temperature Range | -55 °C to 125 °C |
| Temperature Coefficient | 30 ppm/°C |
| Reference Accuracy | 0.4 % |
| Available Packages | TO‑92, SOIC‑8, SOT‑89, SOT‑23‑5 |
| Reference Input Current | 0.7 pA to 1.9 pA |
The output voltage can be adjusted from 0.5 V up to 36 V.
It operates from –55 °C to 125 °C.
The device is offered in TO‑92, SOIC‑8, SOT‑89, and SOT‑23‑5 packages.
The reference voltage has a tolerance of 0.4 %.