The LM431 is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation. The output voltage may be set at any level greater than 2.5 V (VREF) up to 36 V merely by selecting two external resistors that act as a voltage divided network. Due to the sharp turnon characteristics this device is an excellent replacement for many Zener diode applications.
The LM431 is available in space-saving SOIC-8, SOT-23, and TO-92 packages.
| VO (V) | 2.5 |
| Initial accuracy (max) (%) | 0.5, 1, 2 |
| VO adj (min) (V) | 2.5 |
| VO adj (max) (V) | 36 |
| Iz for regulation (min) (µA) | 400 |
| Reference voltage (V) | adjustable |
| Rating | Catalog |
| Temp coeff (max) (ppm/°C) | 97 |
| Operating temperature range (°C) | -40 to 85 |
| Iout/Iz (max) (mA) | 100 |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
| SOT-23 (DBZ) | 3 | 6.9204 mm² 2.92 x 2.37 |
| TO-92 (LP) | 3 | 19.136 mm² 5.2 x 3.68 |
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