Texas Instruments
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Adjustable precision shunt regulator — a programmable zener from 2.5V to 36V. The feedback element in most isolated supplies.
| Part number | TL431 |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Integrated Circuits › Voltage References |
| Package | TO-92 |
| Pins | 3 |
| Voltage (max) | 36 V |
| Voltage (min) | 2.5 V |
TL431 pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | REF | input | Reference input — sets the voltage via a divider |
| 2 | A | passive | Anode |
| 3 | K | passive | Cathode |
Schematic symbol and footprint
Schematic symbol
Footprint: TO-92 — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.
