Diagrama de pines

Pines de Conector de placa base de 24 pines de fuente ATX (ATX12V 2.x)

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Pines

• 1: +3.3V (orange)
• 2: +3.3V (orange)
• 3: GND (black)
• 4: +5V (red) — many older units will not regulate the other rails properly without a few hundred mA of load on +5V
• 5: GND (black)
• 6: +5V (red)
• 7: GND (black)
• 8: PWR_OK / Power Good (grey) — an output flag that goes high 100–500ms after every rail is in spec. Read it, never draw current from it
• 9: +5VSB standby (purple) — live whenever the PSU is plugged in and the rear switch is on, even with the machine off; usually only 2–3A
• 10: +12V (yellow)
• 11: +12V (yellow) — this pin plus 12, 23 and 24 are the detachable four-way block on a "20+4" cable
• 12: +3.3V (orange)
• 13: +3.3V (orange, often with a thin brown +3.3V remote-sense wire crimped into the same terminal — leave the sense wire connected or the 3.3V rail drifts out of tolerance)
• 14: −12V (blue) — low current only, typically 0.3–0.8A
• 15: GND (black)
• 16: PS_ON# (green) — short it to any GND pin to switch the supply on; open = off. This is the only pin you need to bench-start a PSU
• 17: GND (black)
• 18: GND (black)
• 19: GND (black)
• 20: −5V (white) — removed from the spec in ATX12V 2.01, so this position is empty on any modern supply
• 21: +5V (red)
• 22: +5V (red)
• 23: +5V (red)
• 24: GND (black) — the eight black pins share the whole return current, so if you are pulling real amps out of this connector spread the load over several grounds rather than one

Especificaciones

Notas

• Estos colores de cable son una convención de facto de la industria, no una especificación obligatoria — algunas fuentes OEM (propietarias de Dell/HP) se apartan de ella. En cualquier cosa no estándar, verifica por posición de pin y forma del conector, no solo por color.