The CM431A is a three-terminal adjustable shunt voltage regulator with specified thermal stability and pin-to-pin compatible with the earlier 431 series from Champion Microelectronic Corporation. It has a 1.0% initial voltage reference accuracy, sink current capability from 1mA to 100mA, a typical output dynamic impedance less than 200mΩ, adjustable output voltage from VREF to 18V, available in SOT-23, SOT-89, TO-92, and SOP-8 packages, low output noise, and a typical equivalent full range temperature coefficient of 30ppm/°C.
The CM431A is a three‑terminal adjustable shunt regulator with an initial voltage reference accuracy of 1.0% and a sink current capability from 1 mA to 100 mA. Output voltage can be set between the reference voltage and 18 V using two external resistors, and the device offers low output impedance (typical <200 mΩ) for improved load regulation.
The regulator is offered in multiple packages (SOT‑23, SOT‑89, TO‑92, SOP‑8) and includes detailed absolute maximum ratings, power‑dissipation tables, and recommended operating conditions. Ordering information, numbering scheme, and application notes are also provided.
| Initial voltage reference accuracy | 1.0% |
|---|---|
| Sink current capability | 1 mA to 100 mA |
| Typical output dynamic impedance | <200 mΩ |
| Available packages | SOT‑23, SOT‑89, TO‑92, SOP‑8 |
| Low output noise | Yes |
| Operating temperature range (Ta) | 0 °C to 105 °C |
| Cathode‑to‑Anode voltage (Vka) | -0.3 V to 18 V |
| Continuous cathode current (Ix) | -100 mA to 150 mA |
| Reference input current (Iref) | -50 µA to 10 mA |
| Maximum junction temperature (Tj) | 150 °C |
The recommended operating free‑air temperature range is 0 °C to 105 °C.
The CM431A is available in SOT‑23, SOT‑89, TO‑92, and SOP‑8 packages.
The device can sink currents from 1 mA up to 100 mA.
The suffix "A" indicates a 0.5 % reference voltage tolerance.