Texas Instruments
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Fixed -9V regulator, 1A. The negative counterpart to the 78xx — and note the pinout differs: pin 1 is ground here, not input. Wiring one in place of a 78xx destroys it.
| Part number | 7909 |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Integrated Circuits › Linear Regulators & LDOs |
| Package | TO-220-3 |
| Pins | 3 |
| Value | -9V |
| Voltage (max) | 7.909 kV |
| Voltage (min) | 9 V |
| Current | 1 A |
7909 pinout
| Pin | Name | Type | Description |
|---|---|---|---|
| 1 | GND | ground | Ground |
| 2 | IN | power | Negative unregulated input |
| 3 | OUT | power out | Regulated negative output |
Schematic symbol and footprint
Schematic symbol
Footprint: TO-220-3 — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.