Dell laptop charger barrel connector is 7.4mm outer diameter with 5mm inner bore and a center ID pin for power adapter identification. Used on Dell Inspiron XPS and Latitude laptops from 2009 to 2019 before USB-C.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | Center+ | DC positive 19.5V | PWR |
| 2 | Outer- | DC ground return | GND |
| 3 | ID Pin | Adapter identification signal | BUS |
Dell laptop charger barrel connector is 7.4mm outer diameter with 5mm inner bore and a center ID pin for power adapter identification. Used on Dell Inspiron XPS and Latitude laptops from 2009 to 2019 before USB-C.