Pinagem
Pinagem Conector de placa-mãe de 24 pinos da fonte ATX (ATX12V 2.x)
Pinos
- 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
Especificações
| Contatos | 24 (2 × 12), placas antigas 20 |
|---|---|
| Conector | Molex Mini-Fit Jr |
| Passo | 4.2 mm |
| Trilhos | +3.3 V, +5 V, +12 V, −12 V, +5 VSB |
| Tolerância | ±5 % (+3.3, +5, +12 V, 5 VSB), ±10 % (−12 V) |
| +5 VSB | Sempre ligado quando há energia da rede, tipicamente 2–3 A |
| PS_ON# | Ativo em nível baixo, ligue ao GND para ligar |
| Atraso do PWR_OK | 100–500 ms após os trilhos estarem dentro da especificação |
| Fio típico | 18 AWG |
Notas
- Estas cores de fios são uma convenção de fato da indústria, não uma especificação obrigatória — algumas fontes OEM (proprietárias Dell/HP) fogem dela. Em qualquer coisa fora do padrão, confirme pela posição do pino e pela chave do conector, não só pela cor.
