D38999 PCB connectors, or PC Tail connectors, are rugged circular connectors designed for direct soldering onto printed circuit boards (PCBs). They are built to MIL-DTL-38999 specifications, offering superior performance in harsh environments. Your PSU may have come with two separate PCIe 8-pin cables - one with a single 8-pin PCIe connector, and another with two 8-pin PCIe connectors, which we refer to as "pigtail". But is using the pigtail cable safe? Or should you use two individual 8-pin cables? Spoiler alert: Pigtail cables are safe. Each 8 pin connector is "rated" up to 150w, but the cable itself that goes to the PSU, is rated to supply up to 225w. Pigtail connectors are an essential component in a wide variety of technical applications — from audio systems and RF transmission to complex PC builds. In fiber optics, pigtails are fusion-spliced to field fiber inside splice trays — the most common termination method in telecom and data center networks. A short cable having a connection on one side and a segment of wires on the other is called a pigtail connector.
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