[ CABLE / ADAPTER RECORD // LEGACY PC PERIPHERAL POWER (LP4) ]
LP4 4-pin Peripheral Power Extension
Four-position legacy plug carries +12 V, COM, COM, +5 V in the standard peripheral arrangement.
CLASSIFICATION: Internal power cables. Identify protocol, direction, pinout and exact cable revision before connection.
Interface and capability
| Standard / protocol | Legacy PC peripheral power (LP4). Connector appearance alone does not establish compatibility. |
|---|---|
| Endpoint / pinout | Four-position legacy plug carries +12 V, COM, COM, +5 V in the standard peripheral arrangement. |
| Capability / limits | Power only; load limit depends on branch protection, wire gauge, connector quality and devices. |
| Certification / length | Standards define interface requirements, not every assembly’s performance. Certification, mode, current/power rating, direction and maximum length belong to the exact product/revision and complete channel; verify its manufacturer specification. Do not infer certification from connector shape or marketing terminology. |
Compatibility & handling
- Check rail orientation and molded key. Older shells may crack; avoid overloaded daisy-chains and do not force offset pins.
- Inspect connector keying, latch, contact condition, shielding, jacket and model/revision marking. Stop if contacts are bent, loose, scorched, corroded or mismatched.
- Route without tension or sharp bends; follow product bend-radius, strain-relief, current and environmental limits. Test at the intended protocol and mode—physical fit is not a compatibility test.
Sources & further reading
- ATX12V Power Supply Design Guide v2.2 (archived document)Archived copy of the Intel-origin ATX12V design guide; verify exact cable and PSU compatibility with current manufacturer documentation.